Updated on 2024/03/20

写真a

 
UMEHARA, Noritsugu
 
Organization
Graduate School of Engineering Micro-Nano Mechanical Science and Engineering 1 Professor
Graduate School
Graduate School of Engineering
Undergraduate School
School of Engineering Mechanical and Aerospace Engineering
Title
Professor
Contact information
メールアドレス
External link

Degree 3

  1. Engineering Doctor ( 1988.3   Tohoku University ) 

  2. 修士 ( 1985.3   東北大学 ) 

  3. 学士 ( 1983.3   東北大学 ) 

Research Interests 4

  1. Tribology

  2. 機械材料

  3. Non traditional manufacturing

  4. Mechanical Elements

Research Areas 3

  1. Others / Others  / Production Engineering/Processing Studies

  2. Others / Others  / Design Engineering, Machine Functional Elements/Tribology

  3. Others / Others  / Machine Material/Material Mechanics

Current Research Project and SDGs 3

  1. CNx膜の超低摩擦・耐摩耗特性の解明とその応用

  2. 軟質材料の付着及び摩擦制御

  3. 磁場配向性複合体砥石(MAGIC砥石)による加工の基礎と応用

Research History 24

  1. Japan Society for Promotion of Science   Research Center for Science Systems   Chief Researcher

    2020.4

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    Country:Japan

  2. Gifu University   Designated professor

    2019.8

  3. Nagoya University   Technical Center of Nagoya University

    2017.4

  4. Nagoya University   Institute of Innovation for Future Society

    2020.4 - 2022.3

  5. Nagoya University   Graduate School of Engineering

    2019.4 - 2020.3

  6. Nagoya University   Institute of Innovation for Future Society

    2018.10 - 2020.3

  7. Nagoya University   Graduate School of Engineering Micro-Nano Mechanical Science and Engineering 1   Professor

    2017.4

  8. Nagoya University   Trustee / Vice President

    2017.4

  9. Nagoya University   Graduate School of Engineering   Vice Dean of School of Engineering

    2016.4 - 2018.3

  10. Nagoya University   Graduate School of Engineering Department of Mechanical Science and Engineering

    2015.4 - 2016.3

  11. Nagoya University   Graduate School of Engineering Department of Mechanical Science and Engineering

    2012.4 - 2013.3

  12. Nagoya University   School of Engineering

    2012.4 - 2013.3

  13. Nagoya University

    2008.4 - 2012.3

  14. Nagoya University

    2008.4 - 2009.3

  15. Nagoya University

    2008.4 - 2009.3

  16. Professor, Graduate School of Engineering, Nagoya University   Professor

    2004.4

  17. Nagoya University   Graduate School of Engineering Department of Mechanical Science and Engineering   Professor

    2004.4 - 2017.3

  18. Professor, Graduate School of Engineering, Nagoya University   Professor

    2004.4

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    Country:Japan

  19. Professor. Nagoya Institute of Technology

    2002.4 - 2004.3

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    Country:Japan

  20. Assocaite Professor, Tokyo Metropolitan Institute of Technology

    2000.4 - 2002.3

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    Country:Japan

  21. Associate Professor, Tohoku University

    1995.12 - 2000.3

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    Country:Japan

  22. Visiting Associate Professor, Oklahoma State University

    1993.10 - 1994.9

  23. Lecturer, Faculty of Engineering, Tohoku University

    1993.2 - 1995.11

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    Country:Japan

  24. Research associate, Faculty of Engineering Tohoku University

    1988.4 - 1993.1

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    Country:Japan

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Education 3

  1. Tohoku University   Graduate School, Division of Engineering   Department of Mechanicla Engineering

    1986.4 - 1988.3

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    Country: Japan

  2. Tohoku University   Graduate School, Division of Engineering

    1983.4 - 1985.3

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    Country: Japan

  3. Tohoku University   Faculty of Engineering   Department of Mechanical Engineering

    1979.4 - 1983.3

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    Country: Japan

Professional Memberships 12

  1. Japan Society of Mechanical Emgineeris

    1985

  2. Japanese Society of Tribologists   President

    2023.5

  3. 日本トライボロジー学会   正会員

    1987

  4. American Society for mechanical Engineers

    2020.4

  5. American Society for mechanical Engineers   Associate editor

    2020.4

  6. Society of Precison Engineers

    1989

  7. 砥粒加工学会

    1988

  8. 設計工学会   正会員

    2003

  9. 設計工学会

  10. Society of Precison Engineers

  11. 砥粒加工学会

  12. Japan Society of Mechanical Emgineeris

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Committee Memberships 16

  1. American Society of Mechanical Engineers   Associate editor  

    2020.3   

  2. Friction, Springer   Associate editor  

    2012.5   

  3. IFToMM(International Federation for the Promotion of Mechanism and Machine Science)   Member of Technical Committee for Tribology  

    2011.11   

  4. 日本機械学会   理事  

    2018.5 - 2020.4   

  5. Japanese Society of Tribology   President  

    2023.5   

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    Committee type:Academic society

  6. 日本トライボロジー学会   理事  

    2022.5   

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    Committee type:Academic society

  7. 日本トライボrロジー学会   副会長  

    2022.5 - 2023.4   

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    Committee type:Academic society

  8. 精密工学会東海支部   支部長  

    2019.3 - 2020.2   

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    Committee type:Academic society

  9. 日本トライボロジー学会   副会長  

    2018.4 - 2019.3   

  10. 日本トライボロジー学会   理事  

    2017.4 - 2019.3   

  11. 日本トライボロジー学会   理事  

    2017.4 - 2019.3   

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    Committee type:Academic society

  12. 日本機械学会   代表会員  

    2017.4 - 2018.3   

  13. 科学研究費委員会専門委員   審査第1部会工学小委員会  

    2016.1 - 2016.12   

  14. 日本機械学会機素潤滑設計部門   部門長  

    2015.5 - 2016.4   

  15. 日本機械学会機素潤滑設計部門   副部門長  

    2014.5 - 2015.5   

  16. International Journal of Mechanics and Materials in Design, Springer   Associate editor  

    2013.9 - 2018.12   

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Awards 19

  1. 平成25年度科学技術分野の文部科学大臣表彰科学技術賞理解増進部門

    2013.4   文部科学省  

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    Country:Japan

  2. F. W. Taylar Medal

    1995.8   CIRP(International Institution for Production Engineering Research)  

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    Award type:International academic award (Japan or overseas) 

  3. LaRoux K. Gillespie Outstanding Young Manufacturing Award

    1995   Society of Manufacturing Engineers  

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    Award type:International academic award (Japan or overseas)  Country:United States

  4. 日本機械学会賞(論文)

    2022.4   日本機械学会   ベース油中ta-CNx膜の摩擦時反射分光分析その場観察による低摩擦メカニズムの解明

    岡本竜也、梅原徳次、野老山貴行,村島基之

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  5. 日本機械学会賞(論文)

    2019.4   日本機械学会   分離形熱サイフォンを用いた血液凝固付着抑制電気メスの開発

    野老山貴行,大須賀未都,梅原徳次

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  6. 日本トライボロジー学会論文賞

    2019.4   日本トライボロジー学会   ベース油中CNx膜の摩擦界面その場分光分析による摩擦メカニズムの解明

    岡本竜也、梅原徳次、村島基之、斉藤浩二、眞鍋和幹、林 圭二

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  7. トライボロジーオンライン論文賞

    2019.5   日本トライボロジー学会  

    村島基之、梅原徳次、上坂裕之、鄧興瑞

  8. 日本機械学会賞(論文)

    2010.4   日本機械学会   油潤滑下のすべり案内における摩擦係数の速度依存性に及ぼすマイクロパターンの影響

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    Country:Japan

  9. The 15th IFToMM World Congress Best Research Paper Award

    2019.7   The 15th IFToMM World Congress   Effect of Carbonaceous Hard Coatings Overcoat on Friction and Wear Properties for Al Alloy Sliding Bearing in Oil Lubrication

    N. Umehara

  10. International Tribology Conference Sendai 2019 Best Poster Award

    2019.9   International Tribology Conference Sendai 2019   Effect of Multiple Damages AI Learning to Realize Stable Friction with Active Morphing Surfcae – Smart Surface

    M. Murashima, N. Umehara

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    Country:Japan

  11. Best Poster Award

    2019.9   Steering Committee of International Tribology Conference Sendai 2019   Effect of Multiple Damages AI Learning to Realize Stable Friction with Active Morphing Surface – Smart Surface

    M. Murashima, N. Umehara

  12. Best Research Paper Award, The 15th IFToMM World Congress

    2019.7   IFToMM(International Federation for the Promotion of Mechanism and Machine Science)   Effect of Carbonaceous Hard Coatings Overcoat on Friction and Wear Properties for Al Alloy Sliding Bearing in Oil Lubrication

    N. Umehara

  13. 精密工学会東海支部支部賞

    2018.3   精密工学会東海支部  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  14. 日本機械学会創立120周年表彰

    2017.11   日本機械学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  15. 日本機械学会機素潤滑設計部門(業績書)

    2014.4   日本機械学会機素潤滑設計部門  

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  16. 日本機械学会機素潤滑設計部門一般表彰(優秀講演)

    2006   日本機械学会機素潤滑設計部門  

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    Country:Japan

  17. 日本機械学会東北支部技術研究賞

    1997   日本機械学会東北支部  

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    Country:Japan

  18. 機器研究会研究奨励賞

    1993   機器研究会  

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    Country:Japan

  19. 日本機械学会研究奨励賞

    1991   日本機械学会  

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    Country:Japan

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Papers 259

  1. Effect of PAO-4 and MoDTC + ZnDTP oil additive lubricants on the tribological performance of novel tetrahedral amorphous carbon (ta-C) coatings Reviewed International coauthorship International journal

    Mustafa M.M.B., Umehara N., Tokoroyama T., Murashima M., Utsumi Y., Moriguchi H., Shibata A.

    Tribology International   Vol. 193   2024.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tribology International  

    This study was carried out to assess the effect of PAO-4 and mineral oil mixed with MoDTC and ZnDTP on the tribological performance of novel tetrahedral-amorphous-carbon (ta-C) coatings namely P:ta-C, and M:ta-C, were analysed using the Pin-on-Disk Tribo-tester with a fixed normal load, temperature, sliding distance and speed of 20 N, 80 °C, 250 m and 0.068 ms−1 for 60 min, respectively. The C:ta-C, P:ta-C, and M:ta-C showed excellent wear resistance when lubricated with MoDTC + ZnDTP. The formation of weak Zn-derived tribofilm on the P:ta-C coating contributed to the strong wear resistance and reduced friction coefficient. Moreover, the passive transfer of ferrous compounds from the SUJ2 disk induced the development of weak Zn-derived tribofilm on the P:ta-C and M:ta-C.

    DOI: 10.1016/j.triboint.2024.109396

    Scopus

  2. The Influence of Succinimide Dispersant on the Formation of Tribofilm in ATF Friction Reviewed

    TOKOROYAMA Takayuki, TERAI Yusuke, UMEHARA Noritsugu, MURASHIMA Motoyuki, HONDA Akiyuki, ADACHI Tsuneo

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. advpub ( 0 )   2024.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    <p>To elucidate the mechanism for suppressing wear of high-speed bearing steel (SUJ2) used in automatic transmission fluid (ATF), friction and wear tests were conducted in lubricating oils containing different concentrations of succinimide dispersant. The wear volume of the SUJ2 disk in the base oil was approximately 1.4×10⁴mm³. However, with the addition of 0.75 wt.% of succinimide dispersant, the wear volume decreased to about 0.4×10⁴mm³, approximately one-third of the original amount. In Fluid A and Fluid A I₀.₇₅-I₂.₇₅, the reduction in wear volume was observed only in Fluid A I₀.₇₅. This was believed to be due to the presence of succinimide dispersant, which led to the formation of iron oxide within the wear scars, and on the surface, FeS and FeS₂formed as tribofilms. In the case of Fluid A I₀.₇₅, the film hardness was higher, contributing to improved wear resistance. The sole reason for the increased hardness of the tribofilm in Fluid A I₀.₇₅was hypothesized to be the repeated friction of the tribofilm within the surface, leading to the deposition of FeS and FeS₂. This, in turn, was presumed to enhance the density of the tribofilm.</p>

    DOI: 10.18914/tribologist.23-00021

    CiNii Research

  3. The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication Reviewed International coauthorship International journal

    Tokoroyama, T; Wang, S; Umehara, N; Murashima, M; Lee, WY

    TRIBOLOGY LETTERS   Vol. 72 ( 1 )   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tribology Letters  

    The accelerated wear of hydrogenated amorphous carbon in the presence of molybdenum dithiocarbamate (MoDTC) lubrication is a significant challenge when considering its application in engine components. While it is presumed that the use of high-hardness tetrahedral amorphous carbon (ta-C) can effectively address wear issues, irrespective of chemical wear caused by Mo-degradable materials, we have yet to understand the impact of ta-C coating hardness on wear when combined with MoDTC. This uncertainty arises from the assumption that the quantity and structure of Mo-degradable material may be linked to contact pressure, implying that even with a highly hard ta-C coating, wear may vary with the applied load. In this study, we prepared ta-C coatings with four different hardness levels (such as approximately 18.2, 22.1, 46.6, and 53.6 GPa) and conducted friction tests to elucidate the influence of ta-C hardness on wear characteristics under boundary lubrication with MoDTC. Subsequently, we performed chemical analysis (Raman, EDS, and XPS) to identify the chemical species present in the tribofilm, with a particular focus on the 22.1 GPa ta-C coating as a representative of low-hardness ta-C coatings. Our findings revealed that wear suppression was achieved the contact pressure exceeded 200 MPa, irrespective of the coating hardness. Graphical abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s11249-023-01804-6

    Web of Science

    Scopus

  4. Clarification of the Effect of Surface Energy on Tribological Behavior of Two-Phase Lubricant Using Reflectance Spectroscopy and Hydrodynamic Analysis Reviewed International coauthorship International journal

    Hirata, K; Murashima, M; Umehara, N; Tokoroyama, T; Lee, WY; Hashizume, N; Sato, T; Nagata, R; Hanyuda, K; Otsuka, A; Ueda, M

    TRIBOLOGY LETTERS   Vol. 72 ( 1 )   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tribology Letters  

    Recently, a new type of lubricant called two-phase lubricants has been developed to realize a high viscosity index. Two-phase lubricants are mixtures of two different lubricants, realizing low viscosity even at low temperatures due to the temperature dependence of the solubility of the lubricant molecules. In the present paper, the effect of surface energy on the tribological behavior of the two-phase lubricant is clarified using in situ observation with reflection spectroscopy. Sliding surfaces with high hydrogen-bonding terms in the surface energy components attracted high-polar lubricants, resulting in reduced friction. Analysis of the theoretical friction coefficient using Couette flow assumption revealed an important design concept of two-phase lubricants: the concentration of high viscosity lubricants on solid surfaces develops a viscosity distribution in the oil film, resulting in reduced friction.

    DOI: 10.1007/s11249-023-01827-z

    Web of Science

    Scopus

  5. Effect of the graphite domain direction on the friction coefficient of tetrahedral amorphous carbon nitride Reviewed International journal

    Tokoroyama T., Fujiwara C., Murashima M., Yamaguchi M., Umehara N.

    Diamond and Related Materials   Vol. 143   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Diamond and Related Materials  

    Polarized surface-enhanced Raman scattering was applied to low- and high- friction surfaces of tetrahedral amorphous carbon nitride (ta-CNx) to reveal the presence of the graphite structure and investigate the angular dependence of the graphite domains that formed on the topmost surface. The measured D peak intensity differed along the incident electric field toward the sliding direction, from parallel to perpendicular and armchair edges may be present. The results for the low- friction surface indicated that graphite domains exist on the ta-CNx disk and transfer layer on the counter material (Si3N4) ball in directions different from the sliding friction, which suggests an incommensurate configuration.

    DOI: 10.1016/j.diamond.2024.110853

    Scopus

  6. In situ Observation of the Formation of MoDTC-Derived Tribofilm on a Bearing Steel with Different Surface Roughness by Using a Reflectance Spectroscopy and Its Effects on Friction Reviewed International coauthorship International journal

    Hashizume, N; Tokoroyama, T; Umehara, N; Murashima, M; Lee, WY; Zhang, RX; Kunisu, M; Shioji, H; Oharada, K

    TRIBOLOGY LETTERS   Vol. 72 ( 1 )   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tribology Letters  

    In this paper, we evaluated the formation of MoDTC-derived tribofilm and its effects on friction reduction. We conducted in situ observation using reflectance spectroscopy to monitor the tribofilm's evolution during friction, allowing us to estimate its thickness and composition. The results revealed that the rough specimen (Ra= 12.7 nm) maintained a smaller friction coefficient and a larger volume fraction of MoS2 compared to the smooth specimen (Ra= 2.6 nm). Additionally, using the in situ observed composition and contact state, we inferred changes in the frictional properties of the tribofilm formed on both specimens. This analysis suggested that the pronounced direct contact of asperities, especially evident in the rough specimen, promoted the formation of a low-friction tribofilm (primarily MoS2), enabling the rough specimen to sustain lower friction. Graphical abstract: [Figure not available: see fulltext.].

    DOI: 10.1007/s11249-023-01810-8

    Web of Science

    Scopus

  7. Synthesising graphene with renewably-sourced bio-carbon precursors: a brief review Reviewed International coauthorship International journal

    Abd Rahman F.H., Amiruddin H., Abdollah M.F.B., Mohd Zulkifli N.W., Samion S., Umehara N., Tanemura M., Honda M., Morina A.

    Journal of the Brazilian Society of Mechanical Sciences and Engineering   Vol. 46 ( 3 )   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of the Brazilian Society of Mechanical Sciences and Engineering  

    Graphene is a 2D material with exceptional properties that surpass those of many other materials in many respects. Conventional methods of graphene synthesis heavily rely on gaseous carbon (C) precursors, primarily hydrocarbons; such as methane or ethylene; that have significantly negative effects on the environment. The global shift towards sustainability and eco-conscious practices has increased the need for graphene production methods that are sustainable. As such, multiple studies have explored alternative sources of C, particularly bio-based materials, as well as waste-to-value processes. Reusing bio-based materials as C-based precursors not only addresses the urgent need for C sources that are sustainable and environmentally friendly but effectively creates a circular economy in the materials science and technology industry. As such, this present study explores the methods of synthesising, applying, and optimising the conversion of bio-based renewable solid carbon (SC) and liquid carbon (LC) precursors derived from a diverse range of C sources; such as lignocellulosic biomass, agricultural residues, and everyday vegetable oils; into high-quality graphene. The findings emphasise the promising role of renewable SC and LC precursors in the pursuit of sustainable and environmentally responsible methods of graphene production.

    DOI: 10.1007/s40430-024-04743-y

    Scopus

  8. The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-Derived Tribofilm by Using an In Situ Reflectance Spectroscopy Reviewed International coauthorship International journal

    Hashizume, N; Yamamoto, Y; Chen, C; Tokoroyama, T; Zhang, RX; Diao, DF; Umehara, N

    TRIBOLOGY LETTERS   Vol. 72 ( 1 )   2024.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s11249-024-01829-5

    Web of Science

  9. Super hardening of Fe-W alloy plating by phase transformation of amorphous to metal carbides-dispersed nanocrystalline alloys and application as promising alternative for hard chromium plating Reviewed International coauthorship International journal

    Park, JH; Kim, JI; Shinohara, Y; Hagio, T; Umehara, N; Ichino, R

    SURFACE & COATINGS TECHNOLOGY   Vol. 477   2024.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Surface and Coatings Technology  

    Despite the superior hardness, wear resistance, and corrosion resistance of hard chromium (Cr) plating using toxic hexavalent chromium (Cr6+), the gradual restriction on the use of Cr6+ in industrial fields necessitates the development of an alternative, harmless plating material with excellent performance. Here, we report the fabrication of super-hard plating by the simple annealing of electrodeposited Fe–W–C plating as a promising alternative for hard Cr plating. Amorphous-structured Fe–W–C plating, including co-deposited citric acid-derived carbon, forms uniformly dispersed ternary metal carbides inside the plating during annealing, which changes the plating structure from amorphous to nano-carbide-dispersed alloys. The phase-transformed, nanocrystalline Fe–W–C alloy annealed at 700 °C exhibited a maximum hardness of 20.5 GPa, which surpassed the hardness of hard Cr plating (12.5 GPa). The ball-on-disc tribo-test and corrosion test results further demonstrated the superior wear and anti-corrosion properties of the carbide-dispersed Fe–W–C alloy plating compared with hard Cr plating. This study develops the applicability of this super-hard plating as a new hard coating material that overcomes the limitations of conventional metal plating without using any toxic chemical.

    DOI: 10.1016/j.surfcoat.2024.130388

    Web of Science

    Scopus

  10. Development of an Electrocautery Surface Coating Method to Suppress Surgical Smoke Reviewed

    Takayuki Tokoroyama, Motoyuki Murashima, Koki Ogawa, Noritsugu Umehara,

    Journal of Surgery and Research     2024.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.26502/jsr.10020340

  11. Nitrogen-containing diamond-like carbon deposited on glass substrate via filtered cathodic vacuum arc with high-frequency pulsed DC substrate bias Reviewed International coauthorship International journal

    Kim, JI; Lee, WY; Tanaka, K; Tokoroyama, T; Murashima, M; Umehara, N

    SURFACES AND INTERFACES   Vol. 44   2024.1

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Surfaces and Interfaces  

    This research investigates the properties of nitrogen-containing diamond-like carbon (N-DLC) coatings deposited on glass substrate using a high-frequency pulsed-DC substrate bias. The study involved comprehensive investigations to understand how variations in carbon bonding affect the properties of N-DLC coatings. By adjusting the voltage, frequency and duty ratio of the pulsed bias, it was possible to deposit an optical coating with a transmittance of up to 52 % at range of 800–2500 nm while effectively preventing the peeling of the DLC coating on the glass. With increasing the clustered graphite structure in the DLC coating, the sheet resistance was lowered from 2370 kΩ/□ to 36 kΩ/□, and the electrical properties were also improved. The findings provide valuable insights for optimizing N-DLC coatings for non-conductors, e.g., glass, rubber, polymer, and engineering ceramic.

    DOI: 10.1016/j.surfin.2023.103695

    Web of Science

    Scopus

  12. Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction

    Murashima Motoyuki, Aono Kazuma, Umehara Noritsugu, Tokoroyama Takayuki, Lee Woo-Young

    Tribology Online   Vol. 18 ( 6 ) page: 292 - 301   2023.10

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    Language:English   Publisher:Japanese Society of Tribologists  

    <p>With the increasing demand for active friction control, we newly proposed to use dielectrophoresis to change the flow of PG-droplet-containing PAO4 to reduce the friction coefficient. The friction result with a 1-mm roller shows 20% reduction in friction coefficient (from 0.065 to 0.052) at AC 100 V, and in situ observation exhibits that PG tracks are formed over the contact area. On the other hand, at a high bias of 1000 V, the friction coefficient increases to 0.065. In this situation, in situ observation exhibits that PG forms a horseshoe-shaped track covering only the roller edges. Controlled friction tests and FEM analysis using 5-mm rollers revealed a unique behavior; a balanced bias effectively attracts the PG to the roller surface, and surface forces can resist mild dielectrophoretic forces to spread the PG across the roller surface. The present study strongly suggests the importance that the bias strength should be controlled to achieve a balance between surface force and dielectrophoretic force in order to obtain excellent lubrication conditions.</p>

    DOI: 10.2474/trol.18.292

    CiNii Research

  13. Clarification of the effects of adsorption films of ester-blended oil on friction by in situ reflectance spectroscopy Reviewed International coauthorship International journal

    Kodai Hirata, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Naoya Hashizume, Woo Young Lee, Daisuke Takekawa, Keiichi Narita

    Tribology International   Vol. 187   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    In recent years, the demand for friction reduction in oil lubrication systems has become increasingly important due to the need to improve fuel economy and achieve carbon neutrality. Ester-based lubricants are known to show low friction and environmentally friendly, and they have high viscosity indexes. In the present paper, first, in situ reflectance spectroscopy was used to clarify the behavior of the oil-film thickness increase during sliding. The results showed that as the number of ester bonds increased from 1 to 4, the ester oil film thickened and the friction coefficient decreased from 0.10 to 0.06. In addition, oleic-acid-type lubricants were found to have superior ability to form a thicker oil film than the isostearic acid type.

    DOI: 10.1016/j.triboint.2023.108718

    Web of Science

    Scopus

  14. Synthesis and characterisation of oil palm fibre-based graphene deposited on copper particles for superlubricity oil additive Reviewed International coauthorship International journal

    Rahman Nurul Liyana, Amiruddin Hilmi, Bin Abdollah Mohd Fadzli, Umehara Noritsugu

    JURNAL TRIBOLOGI   Vol. 37   page: 128 - 141   2023.6

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  15. Effects of Phosphonate Additives with Hydroxy Groups on the Tribological Properties of ta-C Coatings Under Boundary Lubrication Reviewed International journal

    Kento Tanaka, Takayuki Tokoroyama, Noritsugu Umehara, Motoyuki Murashima, Tadashi Oshio, Kazuhiro Yagishita

    Tribology Letters   Vol. 71 ( 2 )   2023.6

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    Additives that are optimized for diamond-like carbon (DLC) coatings are highly demanded as their applications have expanded recently. In this study, friction tests were conducted on a tetrahedral amorphous carbon (ta-C)/ta-C tribopair using a phosphonate additive with hydroxy groups, which comprises glycerol monooleate (an additive that reduces the friction of DLC) and zinc dialkyl dithiophosphate (an additive that reduces wear), and the obtained tribolayers were analyzed using AFM, XPS, and ToF–SIMS. We found that the phosphonate additive with hydroxy groups tribochemically reacted with the ta-C coating to form a low-shear, hard tribolayer on the surface, thereby reducing the friction and wear of the ta-C coating. Our results indicate that additives with phosphonate structures and hydroxy groups are effective for DLC coatings. Graphical abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s11249-023-01734-3

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  16. An effective strategy for improving the performance of electrodeposited Fe-W alloy plating: Tailoring microstructure by graphene incorporation Reviewed International coauthorship International journal

    Shinohara Yu, Park Jae-Hyeok, Hagio Takeshi, Kim Jae-Il, Lee Woo-Young, Umehara Noritsugu, Ichino Ryoichi

    MATERIALS & DESIGN   Vol. 230   2023.6

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    Despite the excellent performance of hard Cr plating using hexavalent chromium (Cr6+), its use is being restricted owing to recent environmental regulations. Electrodeposited Fe-W alloy is considered a possible alternative, but its high coefficient of friction (COF), high wear rate owing to tribo-oxidation, and high corrosion rate hinder its practical application. In this study, we attempted to solve these problems by modifying the microstructure of Fe-W alloy by incorporating 2D-structured graphene. The effect of graphene incorporation on the structure of the Fe-W alloy and its properties, especially microhardness, wear, and corrosion resistance, were investigated. The results showed the graphene effectively modified the columnar structure of the Fe-W alloy by inhibiting the vertical growth of clusters during electrodeposition, leading to fragmentation of the vertical cluster boundaries. This improved the hardness by as much as 17 % up to 9.1 GPa, and the corrosion resistance by changing the corrosion mechanism from localized corrosion to uniform corrosion. In addition, the graphene reduced the COF and wear rate by reducing the Fe2O3 formed by tribo-oxidation to a lower oxidation state. The structural modification of the plating by graphene incorporation thus provides an effective solution to improving the performance of Fe-W alloys.

    DOI: 10.1016/j.matdes.2023.111938

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  17. Synthesis and characterisation of oil palm fibre-based graphene deposited on copper particles for superlubricity oil additive Reviewed International coauthorship International journal

    Rahman N.L., Amiruddin H., Abdollah M.F.B., Umehara N.

    Jurnal Tribologi   Vol. 37   page: 128 - 141   2023.6

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    This paper presents the synthesis and characterisation of oil palm fibre-based graphene deposited on copper (Cu) particles for superlubricity oil additive. Oil palm fibre (OPF) is employed as a renewable carbon feedstock to grow graphene on Cu particles during Chemical Vapor Deposition (CVD) process. The surface morphology was observed using Scanning Electron Microscopy (SEM) embedded with Energy Dispersive X-Ray Analysis (EDX), and Transmission Electron Microscopy (TEM). Meanwhile, the presence and quality of graphene were validated and examined using Gaussian analysis of Raman spectroscopy. The results show that decreasing the peak D to peak G intensity ratio (ID/IG) tends to improve graphene quality with less number density of structural defects. The I2D/IG value greater than 1 is indicative of multilayer graphene growth. Increasing the full width at half maximum (FWHM) ratio of peak D to peak G (FWHMD/FWHMG) suggests a better dispersion of graphene. The uniform spread of surface ‘wrinkles’ observed by SEM and TEM implies that the distribution of graphene is more homogeneous on the surface of Cu particles. Further investigation into the synergistic effect of graphene as an oil additive can be performed to achieve superlubricity properties.

    Scopus

  18. Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature Reviewed International coauthorship International journal

    Kim Jae-Il, Lee Woo-Young, Tokoroyama Takayuki, Umehara Noritsugu

    ACS APPLIED MATERIALS & INTERFACES   Vol. 15 ( 15 ) page: 19715 - 19729   2023.4

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    The anti-friction of diamond-like carbon (DLC) is achieved by a well-developed carbonaceous transfer layer, and Ti-doped DLC is developed into a robustly built-up carbonaceous transfer layer. The friction performance of DLC depends on the operating environment, e.g., ambient gas, humidity, temperature, lubricants, and mating material. In this study, we aimed to reveal the environmental sensitivities of Ti-DLC on friction characteristics. To this end, a Ti-DLC was rubbed against a steel ball, and friction behaviors were evaluated with different gas compositions, humidity, and temperature. Finally, we identified that fractional coverage of water on surfaces affected the anti-graphitization on Ti-DLC, leading to avoiding friction reduction.

    DOI: 10.1021/acsami.3c01704

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  19. Novel friction stabilization technology for surface damage conditions using machine learning Reviewed International coauthorship International journal

    Motoyuki Murashima, Takazumi Yamada, Noritsugu Umehara, Takayuki Tokoroyama, Woo Young Lee

    Tribology International   Vol. 180   2023.2

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    The surface damage is a serious cause of failure in tribosystems. In the present paper, we propose a new damage avoidance method that combines a contact position control system (e.g., morphing surface) and artificial-intelligence-based control (e.g., genetic algorithm: GA) to achieve stable friction and long life of sliding surfaces. In the case of the single-damage condition, the GA sequentially avoided contact with the damaged position, and finally complete damage avoidance was achieved. In the multiple-damage condition, we confirmed that learning by GA effectively stabilized friction, although the learning time was longer. In summary, the contact-position control method should provide new capabilities on real machine surfaces where unexpected damage occurs.

    DOI: 10.1016/j.triboint.2023.108280

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  20. Long-term low-friction of Ti-overcoated and-doped DLCs: Robustly developed carbonous transfer layer with titanium Reviewed International coauthorship International journal

    Kim Jae-Il, Lee Woo-Young, Tokoroyama Takayuki, Umehara Noritsugu

    CARBON   Vol. 204   page: 268 - 283   2023.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Carbon  

    Diamond-like carbon (DLC) has been under the research spotlight as an exceptional solid lubricant. Its friction performance is depending on a well-developed transfer layer upon its counterparts. Nowadays, iron-and brass-based metals have been utilized as the counterpart against DLC, however, it is reported their friction behaviors are somewhat inferior compared to titanium alloys. In this study, we tried to improve their friction behaviors and modified the contact interface from Fe/C to C/C by Ti addition in DLC. It was revealed that Ti, which has good adhesion for Fe and C, promoted the development of carbon transfer on Fe-based counterpart. Furthermore, Ti built-up a thick carbonous transfer layer and make better the friction performance of DLC sliding against Fe.

    DOI: 10.1016/j.carbon.2022.12.012

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  21. Influence of Defects in Graphene-Like Network of Diamond-Like Carbon on Silica Scale Adhesion Reviewed International journal

    Y. Nakashima, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, K. Murakami

    Tribology Letters   Vol. 71 ( 1 )   2023.2

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    Silica scale adhesion onto geothermal power plant equipment reduces the power efficiency. In our previous study, diamond-like carbon (DLC) coatings with low sp2 fractions and high hydrogen contents were found to suppress silica adhesion. Therefore, the present study was aimed at clarifying the mechanism of silica adhesion onto the graphene-like network of DLC. In-lens scanning electron microscopic imaging of silica adhered onto defective graphene indicated that the adhesion occurred on defects in the graphene-like network. First-principles calculations revealed that the graphene with hydrogen-terminated defects exhibited reduced adsorption energy between silica and the graphene-like network. Overall, the simulations and experiments helped establish a silica adhesion model in which defects in the graphene-like network of DLC behave as silica adhesion sites. Graphical Abstract: [Figure not available: see fulltext.].

    DOI: 10.1007/s11249-022-01690-4

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  22. Mechanical properties of maze-like carbon nanowalls synthesized by the radial injection plasma enhanced chemical vapor deposition method Reviewed International coauthorship International journal

    Swapnil Ghodke, Motoyuki Murashima, Dennis Christy, Ngo Van Nong, Kenji Ishikawa, Osamu Oda, Noritsugu Umehara, Masaru Hori

    Materials Science and Engineering: A   Vol. 862   2023.1

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    The unique structural properties of vertically aligned graphene sheets or Carbon Nanowalls (CNWs) have attracted great interests for their potential for various applications in microelectronic devices, energy storage, and catalyst support materials. During the handling or operation of the devices, tension and/or pressure are often needed. Under such conditions, CNWs must undergo compression and stress. Therefore, the deformation mechanism and evolution behavior of the CNW structures under load play a critical role in the performance and reliability of the devices. In this study, the mechanical properties of a typical maze-like CNW structure synthesized by a Radial Injection Plasma Enhanced Chemical Vapor Deposition (RI-PECVD) technique were analyzed by employing the nanoindentation method. The measured compressive strength of the CNW structure was 50 MPa with an average modulus E value of ∼28 GPa, which is significantly higher than that of pyrolytic graphite and other graphene-based materials such as 3D graphene-derived carbon, commercial graphene, and reduced graphene oxide films. An elastoplastic behavior of a soft material was observed in high-resolution microscopy and a mechanism of deformation for CNWs is elucidated.

    DOI: 10.1016/j.msea.2022.144428

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  23. Tribo-chemical wear of various 3d-transition metals against DLC: Influence of tribo-oxidation and low-shear transferred layer Reviewed International coauthorship International journal

    Jae-Il Kim, Woo-Young Lee, Takayuki Tokoroyama, Motoyuki Murashima, Noritsugu Umehara

    Tribology International   Vol. 177   page: 107938 - 107938   2023.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.triboint.2022.107938

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  24. Carbon-based coatings for suppression of silica adhesion in geothermal power generation Reviewed International journal

    Y. Nakashima, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, D. Mori

    Tribology International   Vol. 177   page: 107956 - 107956   2023.1

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    DOI: 10.1016/j.triboint.2022.107956

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  25. Essence of Tribology and Its Future Invited

    UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 67 ( 12 ) page: 813 - 813   2022.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (other academic)   Publisher:Japanese Society of Tribologists  

    DOI: 10.18914/tribologist.67.12_813

    CiNii Research

  26. The Tribological Property of a-C:H Coating with Tribolayer by Additive Having Glycerol and Phosphate Oxide Structure Reviewed International coauthorship International journal

    Tokoroyama T., Tanaka K., Kani T., Murashima M., Lee W-Y, Umehara N., Oshio T., Yagishita K.

    TRIBOLOGY LETTERS   Vol. 70 ( 4 )   2022.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tribology Letters  

    The tribological properties of a-C:H coating sliding against a SUJ2 ball, a SUJ2 roller, and an a-C:H coated roller were investigated under temperatures ranging from 20 to 80 °C in PAO with different additives. The additives had a glycerol and hydroxyl functional group in one molecule to enhance additive adsorption for mating with the a-C:H coating disk material and to build a phosphorus oxide tribolayer. Additives with different numbers of hydroxyl groups and primary or secondary-type C6H13O structures were also prepared. The tribolayer derived from each additive was analyzed via EDS, XPS, and ToF-SIMS. XPS depth analysis for the tribolayers revealed that additives were dissociated by friction and suggested C–O bond cleavage occurred. Graphical Abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s11249-022-01659-3

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  27. Metal matrix nanocomposites in tribology: Manufacturing, performance, and mechanisms Reviewed International coauthorship

    Pan Shuaihang, Jin Kaiyuan, Wang Tianlu, Zhang Zhinan, Zheng Long, Umehara Noritsugu

    FRICTION   Vol. 10 ( 10 ) page: 1596 - 1634   2022.10

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    DOI: 10.1007/s40544-021-0572-7

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  28. New in situ low-friction technology for diamond-like carbon coatings using surface discharge treatment in ambient air Reviewed International coauthorship International journal

    Motoyuki Murashima, Shintaro Oyama, Hiroyuki Kousaka, Takayuki Tokoroyama, Woo-Young Lee, Noritsugu Umehara

    Tribology International   Vol. 165   page: 107306 - 107306   2022.10

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    DOI: 10.1016/j.triboint.2021.107306

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  29. Friction characteristics of amorphous carbon coating against various 3d-transition metals Reviewed International journal

    Jae Il Kim, Woo Young Lee, Takayuki Tokoroyama, Motoyuki Murashima, Noritsugu Umehara

    Tribology International   Vol. 174   2022.10

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    DLC has anti-friction characteristics due to the tribofilm formed by the carbon transfer to its mating material. However, its coefficient of friction depends on each mating material. This study aims to investigate a suitable mating material against diamond-like carbon coatings. We selected four 3d-transition metals (Ti, Fe, Ni and Cu) as the mating materials based on the chemical affinities for carbon, i.e., carbide formability and work of separation. Among them, Ti had the lowest coefficient of friction, followed by Fe, Ni and Cu. The structures of tribofilm formed on mating materials were characterized non-destructively using Raman spectroscopy consisting of confocal optics. It revealed that Ti could strongly attract the carbon and stably formed carbon-containing tribofilm, leading to low friction.

    DOI: 10.1016/j.triboint.2022.107690

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  30. The tribological property of a-C:H coating with tribolayer by additive having glycerol and phosphate oxide structure Reviewed International journal

    T. Tokoroyama, K. Tanaka, T. Kani, M. Murashima, W.Y. Lee, N. Umehara, T. Oshio, K. Yagishita

    Tribology letters   Vol. 70   page: 118   2022.10

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  31. The Effect of Rubber Deterioration on Static Friction on Metal Surfaces with Different Surface Roughness Characteristics Reviewed

    MURASHIMA Motoyuki, SASO Tomohiro, UMEHARA Noritsugu, TOKOROYAMA Takayuki, HIRANO Ryo, OKIDATE Ryo

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 67 ( 9 ) page: 646 - 661   2022.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    <p>Many studies on friction of rubber materials revealed the effect of power spectrum of surface roughness on friction. On the other hand, quantitative comparison of the effects of specific surface roughness parameters has not been sufficiently conducted as well as the effects of rubber deterioration on friction. In the present paper, the effect of rubber deterioration on static friction and its variation with surface profile (hard chromium (HCr) treatment, salt-bath nitrocarburizing (SBN) treatment, and gas nitrocarburizing (GN) treatment is clarified. The friction test results showed interesting results that the static friction coefficient of SBN surfaces decreased with rubber degradation, whereas the static friction coefficient of GN surfaces increased. Subsequently, we analyze the main characteristics of surface roughness parameters and explore the mechanism. First, due to the small skewness of the GN surface, the blockage of leakage channels is developed, resulting in the formation of oil reservoirs and a squeeze effect due to micro-slip of the rubber. Second, the surface of SBN has high peaks and the bearing area ratio of the peaks is high, which prevents the occurrence of leak-channel blockage and allows the peaks to penetrate rubber. The present paper specifically clarifies that these surface properties provide the obtained friction results.</p>

    DOI: 10.18914/tribologist.22-00001

    CiNii Research

  32. Effect of fracture properties and surface morphology on wear of DLC coatings at severe contact condition Reviewed International coauthorship International journal

    Yusei Yamada, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Woo Young Lee, Hajime Takamatsu, Yoshikazu Tanaka, Yoshiharu Utsumi

    Tribology International   Vol. 169   page: 107486 - 107486   2022.5

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    The present study shows how the fracture properties and surface morphology of diamond-like carbon (DLC) coatings affect their wear properties. Nine types of DLC coatings with different carbonaceous structures and surface roughness were prepared. Fracture toughness was quantitatively evaluated from the crack length on the coatings. Subsequently, wear tests were conducted under boundary lubrication to evaluate the wear properties. The results showed that the wear rate of DLC coatings with rough surfaces decreased with increasing fracture toughness, while that of smooth DLC is independent of fracture toughness. In the DLCs with rough surface, it was found that brittle fracture occurred, and the fracture significantly increased the wear rate. Additionally, the ratio of the stress intensity factor to the fracture toughness value (K/KIC) was presented, showing comprehensive wear behaviors.

    DOI: 10.1016/j.triboint.2022.107486

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  33. Development of a new diamond-like carbon surface treatment method with electric discharge for short running-in and friction reduction Reviewed International coauthorship International journal

    Motoyuki Murashima, Misato Maeda, Deng Xingrui, Noritsugu Umehara, Hiroyuki Kousaka

    Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology   Vol. 236 ( 5 ) page: 1020 - 1030   2022.5

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    The present paper proposes a new treatment method for diamond-like carbon (DLC) coatings using electric discharge. DLC coatings exhibit excellent mechanical and tribological properties due to their unique carbonaceous structure. Several surface treatment methods were presented to achieve short running-in and low friction. However, in-situ surface treatment is needed to extend the life of machines and maintain their performance. Here, we propose an electric discharge treatment with a simple electrical circuit. As a result, the friction coefficient drastically drops from 0.3 to 0.11. Interestingly, the drop starts shortly after the discharge starts. Consequently, the running-in is shortened to about 6-m sliding compared to no discharge condition, which does not show any running-in more than 68-m sliding. Raman analysis reveals that a transfer layer on the ball surface is composed of carbonaceous material and the structure exhibits graphite-like characteristics. However, there is visible damage on the DLC surface. Another friction test shows a very low friction coefficient of 0.04 using a transfer layer-covered ball and a new DLC disk with a smooth surface. In conclusion, the combination of a transfer layer and smooth DLC surface is needed to exhibit excellent tribological performance, indicating the importance of less damage treatment. Next, pulse discharge treatment is demonstrated to achieve less damage to the DLC coating. As a result, the pulse discharge method reduces friction and surface damage. In conclusion, the proposed treatment methods using electric discharge not only show the potential for reducing friction, but also the feasibility of in-situ treatment during machine operation.

    DOI: 10.1177/13506501211013126

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  34. Realization of near-less friction of ta-CNx coating under R32 refrigerant environment Reviewed International journal

    Wooyoung Lee, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Norihisa Horaguchi, Takao Ishimoto

    Tribology International   Vol. 168   page: 107404 - 107404   2022.4

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    Diamond-like carbon (DLC) has attracted attention from refrigeration industry due to their excellent tribological behaviors. This study focused on high friction-efficiency in hydrofluorocarbon (HFC) refrigerant, however, DLC coatings have not been achieved in previous research. We evaluated friction behavior of tetrahedral amorphous carbon nitride under difluoromethane (R32) and R32/polyolester (POE) mixture environment, respectively. Friction coefficients of 0.02 and 0.03 were recorded under R32 and R32/POE atmosphere, respectively. These results emphasize an importance of the tribofilm consisted of graphite-and polymer-like carbon, terminated with R32 components (C, H, and F).

    DOI: 10.1016/j.triboint.2021.107404

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  35. Tribological Property of ta-CNx:Ta Deposited via Ion Beam Assisted-Filtered Arc Deposition Reviewed International journal

    T. Tokoroyama, Y. Tagami, M. Murashima, W. Y. Lee, N. Umehara, H. Kousaka

    Tribology International   Vol. 168   page: 107450 - 107450   2022.4

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    Improving the hardness of amorphous carbon nitride with tantalum was realized by using ion beam assisted filtered arc deposition to obtain a low friction coefficient and low specific wear rate in ambient air. The coatings were prepared with different nitrogen flow during coating at different discharge cycles of tantalum. The wear scar and as-deposited surfaces were observed and analyzed by means of FESEM, AES, XPS, and Raman analysis. The lowest friction coefficient (~0.07) was obtained for ta-C:Ta200, which exhibited a low specific wear rate of < 1.0 × 10−7 mm3/Nm. The XPS analysis revealed the existence of amorphous Ta2O5, and the friction coefficient seemed to be positively correlated with oxygen desorption from the coatings.

    DOI: 10.1016/j.triboint.2022.107450

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  36. Relationship between Friction Coefficient of Carbonaceous Hard Coatings and Surface Energy of Friction Scar from Contact Angels of Condensed Liquid with ESEM Reviewed

    UMEHARA Noritsugu, NAKAO Taichi, TERADA Makoto, KOUSAKA Hiroyuki, MURASHIMA Motoyuki

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 67 ( 2 ) page: 126 - 138   2022.2

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    <p>Carbonaceous hard coatings have promising tribological properties, such as low friction, high hardness and high wear resistance. In particular, CN<i><sub>x </sub></i>(Carbon Nitride) coating and a-C:H (hydrogenated amorphous carbon) coating show ultra low friction coefficient (<i>µ < </i>0.01) in dry nitrogen gas. However, the mechanism of ultra low friction has not clarified. We have developed the in-situ measurement method on friction area during sliding to clarify the ultra low friction mechanism of carbonaceous hard coating. In this research, we demonstrated in-situ measurement of surface energy on friction area during friction by manufacturing friction tester in ESEM (Environmental Scanning Electron Microscope) chamber. Moreover, we estimated the effect of surface energy on friction property of carbonaceous hard coatings. We used UV irradiation to prepare the carbonaceous hard coatings, which have different surface energy. From the results, friction coefficient of carbonaceous hard coating decreased with surface energy, however the approximate line which showed the relationship between friction coefficient and surface energy did not pass through the origin. It suggested that friction occurred beneath the sliding surface in coatings or transferred layers not on the surface. Moreover, surface energy of carbonaceous hard coatings approached the value of graphite when carbonaceous hard coatings showed low friction. It suggested that structure of carbonaceous hard coatings had become graphite-like structure.</p>

    DOI: 10.18914/tribologist.21-00018

    CiNii Research

  37. Metal matrix nanocomposites in tribology: Manufacturing, performance, and mechanisms Reviewed International coauthorship International journal

    Pan Shuaihang, Jin Kaiyuan, Wang Tianlu, Zhang Zhinan, Zheng Long, Umehara Noritsugu

    Friction   Vol. 10   page: 1596 - 1634   2022.1

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  38. The Tribological Properties of Hydrogenated DLC Coating Lubrication with Additive Having Glycerol and Phosphonate Structure Reviewed International journal

    Kani T., Tokoroyama T., Umehara N., Murashima M., Lee W.Y., Yagishita K.

    Vierteljahresschrift fur Sozial und Wirtschaftsgeschichte   Vol. 108 ( 4 ) page: 263 - 270   2021.12

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    In general, several mechanical parts are subjected to friction and wear. To prevent wear and high friction coefficient under lubrication, additives can work to reduce friction force, to build up thin film on surfaces which is so-called tribofilm. Recently, Diamond-Like Carbon (DLC) is focused because it has excellent low friction and high wear proof as solid lubricant. However, several researchers already reported that tetrahedral amorphous carbon (ta-C) showed abnormal wear when it rubbed with glycerol mono-oleate (GMO) that is a kind of additive, although it showed very low friction coefficient. To improve tribological properties, new additives were developed that had both phosphate-oxide structure derived from ZnDTP which had high wear resistance and hydroxy group derived from GMO in one structure. To clarify the effects of the additives, friction tests were performed fixed-roller-on-disk type rotating friction tester. In the friction tests, hydrogenated amorphous carbon (a-C:H) disks, and a-C:H coated rollers were used under boundary lubrication condition at 20-80°C. Friction tests were conducted in Poly-α-olefin (PAO) oil with each GMO and the additives. The results exhibited that a-C:H gave ultra-low friction with the additive. Elemental analysis of the surface showed that tribofilm of phosphorus and oxygen was detected on the a-C:H surface in the additive used condition.

    DOI: 10.25162/VSWG-2021-0016

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  39. In situ observation of the formation of MoDTC-derived tribofilm on a ta-C coating using reflectance spectroscopy and its effects on friction Reviewed International coauthorship International journal

    Naoya Hashizume, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Woo-Young Lee

    TRIBOLOGY INTERNATIONAL   Vol. 162   page: 107128   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    We clarify the relationships between tribofilm thickness, chemical composition, and friction coefficient by combining in situ and ex situ analyses. An in situ reflectance observation is conducted for MoDTC-derived tribofilm on a ta-C coating during friction tests. The results show that the thicker the tribofilm is, the lower the friction coefficient. In addition, the refractive index increases as friction decreases. XPS analysis shows that the topmost surface of the thick tribofilm contains a higher MoS2 concentration than the deep position. Therefore, the generated MoS2-rich tribofilm is considered to reduce friction. In addition, as the MoS2 tribofilm wears out, friction increases. In conclusion, we have developed a MoDTC-derived tribofilm formation model using a new method of in situ optical measurement.

    DOI: 10.1016/j.triboint.2021.107128

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  40. Improved wear imbalance with multilayered nanocomposite nanocrystalline Cu and tetrahedral amorphous carbon coating Reviewed International coauthorship

    Kim Jae-Il, Kim Jongkuk, Kim Do Hyun, Jang Young-Jun, Umehara Noritsugu

    CERAMICS INTERNATIONAL   Vol. 47 ( 18 ) page: 25664 - 25673   2021.9

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    DOI: 10.1016/j.ceramint.2021.05.292

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  41. The Tribological Properties of Hydrogenated DLC Coating Lubrication with Additive Having Glycerol and Phosphonate Structure Reviewed

    KANI Takumi, TOKOROYAMA Takayuki, UMEHARA Noritsugu, MURASHIMA Motoyuki, LEE Woo-Young, YAGISHITA Kazuhiro

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 66 ( 7 ) page: 570 - 578   2021.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    <p>In general, several mechanical parts are subjected to friction and wear. To prevent wear and high friction coefficient under lubrication, additives can work to reduce friction force, to build up thin film on surfaces which is so-called tribofilm. Recently, Diamond-Like Carbon (DLC) is focused because it has excellent low friction and high wear proof as solid lubricant. However, several researchers already reported that tetrahedral amorphous carbon (ta-C) showed abnormal wear when it rubbed with glycerol mono-oleate (GMO) that is a kind of additive, although it showed very low friction coefficient. To improve tribological properties, new additives were developed that had both phosphate-oxide structure derived from ZnDTP which had high wear resistance and hydroxyl group derived from GMO in one structure. To clarify the effects of the additives, friction tests were performed fixed-roller-on-disk type rotating friction tester. In the friction tests, hydrogenated amorphous carbon (a-C:H) disks, and a-C:H coated rollers were used under boundary lubrication condition at 20-80°C. Friction tests were conducted in Poly-α-olefin (PAO) oil with each GMO and the additives. The results exhibited that a-C:H gave ultra-low friction with the additive. Elemental analysis of the surface showed that tribofilm of phosphorus and oxygen was detected on the a-C:H surface in the additive used condition.</p>

    DOI: 10.18914/tribologist.21-00001

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  42. Wear acceleration of a-C:H coatings by molybdenum-derived particles: Mixing and temperature effects Reviewed International journal

    K. A.M. Kassim, T. Tokoroyama, M. Murashima, W. Y. Lee, N. Umehara, M. M.B. Mustafa

    Tribology International   Vol. 159   page: 106944 - 106944   2021.7

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    MoDTC has also been reported to degrade into other Mo-derived compounds. It is essential to analyze the effects of each type of MoDTC-degraded material on DLC. Therefore, we chose powder-type MoDTC, MoS2, Mo, MoO3, and Mo2C additives to be dispersed individually into a base oil and tested on an a-C:H sliding against a steel ball under boundary lubrication conditions at 80 °C. We then obtained surface-enhanced Raman scattering (SERS), which proved that MoS2 has the possibility of extracting hydrogen from the topmost surface as chemical wear (hydrogen content decreased from 30 to 35 at.% to 20 at.% of as-deposited) and that MoO3, MoDTC, and Mo have the possibility of catalytic reactions with carbon atoms. Mo2C exhibited abrasive accelerate of the a-C:H wear.

    DOI: 10.1016/j.triboint.2021.106944

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  43. Evaluation of Mechanical Characteristics of Tribofilm Formed on the Surface of Metal Material Due to Friction under Lubrication with Automatic Transmission Fluid Reviewed

    TOKOROYAMA Takayuki, NISHIMOTO Takashi, MURAKAMI Yasuhiro, HONDA Akiyuki, MITSUI Hideaki, TERAI Yusuke, MURASHIMA Motoyuki, LEE Woo-Young, UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 66 ( 6 ) page: 461 - 469   2021.6

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    <p>In this study, nano-scratch tests were conducted using atomic force microscope (AFM) to clarify the hardness of a tribofilm derived from an additive (Fluid A or Fluid B in automatic-transmission fluid) formed on an SKS3 cold work tool steel substrate surface. Comparisons between nano-indentation hardness tests and AFM nano-scratch tests were performed for each specimen. Prior to these tests, the tribofilms on the SKS3 substrate were examined with energy-dispersive spectroscopy (EDS). In order to calculate the hardness of the tribofilm from the nano-scratch results, we assumed that the AFM diamond tip acted as an abrasive to plough the tribofilm. The phosphorus-derived tribofilm formed from Fluid A was harder than the sulfur-derived tribofilm from Fluid B, and it was calculated that the phosphorus-derived tribofilm was approximately 2.64 GPa and the sulfur-derived tribofilm was 1.89 GPa. After 10 nano-indentation hardness tests on each tribofilm, the maximum indentation depth into the tribofilm formed from Fluid A was approximately 31 nm, while it was approximately 36 nm for Fluid B. These results are qualitatively consistent with the hardness results obtained by the AFM nano-scratch test method.</p>

    DOI: 10.18914/tribologist.20-00020

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  44. Realization of A Novel Morphing Surface using Additive Manufacturing and its Active Control in Friction Reviewed International journal

    Motoyuki Murashima, Yusuke Imaizumi, Masato Kawaguchi, Noritsugu Umehara, Takayuki Tokoroyama, Toshiyuki Saito, Masayuki Takeshima, Yosuke Tsukiyama, Isami Nitta

    ASME, Journal of Tribology   Vol. 143 ( 5 ) page: 1 - 29   2021.5

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    <title>Abstract</title>
    As the need for higher efficiency of engineering components increases, so does the demand for functional surfaces. While various tribosurfaces (e.g., texturing and coatings) have been developed, many researches are aimed at static functionality. On the other hand, due to a wide range of environmental adaptability and active control, active-morphing surfaces can be highly efficient and robust. In this paper, we demonstrate a novel morphing surface and its realization using additive manufacturing (AM). By using a diaphragm structure, morphing performance is achieved even if a hard resin material is used. When air pressure is applied to the backside of the diaphragm, it changes to a convex shape, and vice versa. The concept requires a complex structure for arranging airflow and a solid morphing system. The AM is one great technique to create such complex structure. As a result of actual manufacturing, the created morphing structure realizes a large morphing of 600 µm or more. In addition, the shape changes reversibly depending on the air pressure. The surface also exhibits very interesting tribological characteristics. The surface shows a friction coefficient of 0.5-1.7 with a convexity, and then decreases to about 0.3 with a concavity. A real-contact area measurement reveals that the novel property occurs due to change in the real-contact area depending on surface morphology. In conclusion, the present paper provides a new concept of a novel morphing tribosurface, which selectively performs as a low-friction or break-like surface, created using AM.

    DOI: 10.1115/1.4050269

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  45. Active Friction Control in Lubrication Condition Using Novel Metal Morphing Surface Reviewed International journal

    M. Murashima, T.Tokoroyama, N. Umehara

    Tribology International   Vol. 156   page: 1 - 9   2021.5

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  46. Nanotextured Mold Surface with DLC Coating for Reduction in Residual Ceramic Particles Reviewed International journal

    Motoyuki Murashima, Koki Hojo, Shigehiro Ito, Noritsugu Umehara, Takayuki Tokoroyama, Tomonori Takahashi, Minoru Imaeda

    LANGMUIR   Vol. 37 ( 12 ) page: 3563 - 3574   2021.3

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    In the ceramic industry, ceramic particles remain on a mold surface due to which the mold requires frequent cleaning during press molding, reducing productivity. Surface texturing and tetrahedral amorphous carbon (ta-C) coatings are well-known surface-energy controllable treatments developed for low adhesion, low friction, and high wear resistance. In the present paper, we demonstrate the effect of reducing ceramic residues using nanotexturing, ta-C coatings, and their combination. We compare two surface morphologies (i.e., 770 nm pitch nanotexturing and flat) and five materials (i.e., nonhardened steel, hardened steel, ta-C, and two types of nitrogen-doped ta-C (ta-CNx). Molding test results show that the ta-C coating on flat surfaces with the highest hardness of 30 GPa shows the lowest residual amount of 5.9 mu g for Al2O3 ceramic particles. The amount is 82% less than that of the nonhardened steel. The ta-CNx(20), made with a nitrogen flow rate of 20 sccm, shows the lowest residual amount of 234 mu g for SiO2 ceramic particles, which is 81% less than that of the nontextured ta-CNx(20). In conclusion, we provide design guidelines for nanotextured mold surfaces including the texturing pitch should be small enough for ceramic particles; the mold surface should be sufficiently hard; the lower the surface energy per unit area, the less residues of ceramic particles.

    DOI: 10.1021/acs.langmuir.0c03435

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  47. The Clarification of Friction Mechanism in Oil Lubrication for CN<i><sub>x</sub></i> Coating by <i>In-Situ</i> Observation of Friction Area with Reflectance Spectroscopy Reviewed International journal

    Okamoto Tatsuya, Umehara Noritsugu, Murashima Motoyuki, Saito Koji, Manabe Kazuyoshi, Hayashi Keiji

    Tribology Online   Vol. 16 ( 1 ) page: 49 - 58   2021

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    <p>To clarify the low friction mechanism of CN<i><sub>x</sub></i> coating in PAO oil lubrication, we measured reflectance spectrum at friction area <i>in-situ </i>by reflectance spectroscopy during friction test against a sapphire hemisphere pin in PAO oil. We observed and estimated the thickness of PAO oil film, the surface roughness of CN<i><sub>x</sub></i> coating, thicknesses, and polarizability of the transformed layer formed on bulk CN<i><sub>x</sub></i> coating during friction test by analyzing reflectance spectrum. We proposed that the decreasing of load ratio of boundary lubrication mode to total load is the one of governing factor to reduce friction on the basis of the increasing of <i>Λ</i> value. Also we proposed the increasing of adsorption of PAO oil to the CN<i><sub>x</sub></i> transformed layer is the second governing factor on the basis of the increasing of polarizability of PAO oil and transformed layer, that leads to the increasing of van der Waals force between transformed layer and PAO oil as low friction mechanism of CN<i><sub>x</sub></i> in PAO oil lubrication.</p>

    DOI: 10.2474/trol.16.49

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  48. Evaluation of Mechanical Characteristics of Tribofilm Formed on the Surface of Metal Material Due to Friction under Lubrication with Automatic Transmission Fluid Reviewed International journal

    Tokoroyama Takayuki, Nishimoto Takashi, Murakami Yasuhiro, Honda Akiyuki, Mitsui Hideaki, Terai Yusuke, Murashima Motoyuki, Lee Woo-Young, Umehara Noritsugu

    Tribology Online   Vol. 16 ( 4 ) page: 255 - 262   2021

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    <p>In this study, nano-scratch tests were conducted using atomic force microscope (AFM) to clarify the hardness of a tribofilm derived from an additive (Fluid A or Fluid B in automatic-transmission fluid) formed on an SKS3 cold work tool steel substrate surface. Comparisons between nano-indentation hardness tests and AFM nano-scratch tests were performed for each specimen. Prior to these tests, the tribofilms on the SKS3 substrate were examined with energy-dispersive spectroscopy (EDS). In order to calculate the hardness of the tribofilm from the nano-scratch results, we assumed that the AFM diamond tip acted as an abrasive to plough the tribofilm. The phosphorous-derived tribofilm formed from Fluid A was harder than the sulfur-derived tribofilm from Fluid B, and it was calculated that the phosphorous-derived tribofilm was approximately 2.64 GPa and the sulfur-derived tribofilm was 1.89 GPa. After 10 nano-indentation hardness tests on each tribofilm, the maximum indentation depth into the tribofilm formed from Fluid A was approximately 31 nm, while it was approximately 36 nm for Fluid B. These results are qualitatively consistent with the hardness results obtained by the AFM nano-scratch test method.</p>

    DOI: 10.2474/trol.16.255

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  49. The Tribological Properties of Hydrogenated DLC Coating Lubrication with Additive Having Glycerol and Phosphonate Structure Reviewed International coauthorship International journal

    Kani Takumi, Tokoroyama Takayuki, Umehara Noritsugu, Murashima Motoyuki, Lee Woo-Young, Yagishita Kazuhiro

    Tribology Online   Vol. 16 ( 4 ) page: 263 - 270   2021

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    <p>In general, several mechanical parts are subjected to friction and wear. To prevent wear and high friction coefficient under lubrication, additives can work to reduce friction force, to build up thin film on surfaces which is so-called tribofilm. Recently, Diamond-Like Carbon (DLC) is focused because it has excellent low friction and high wear proof as solid lubricant. However, several researchers already reported that tetrahedral amorphous carbon (ta-C) showed abnormal wear when it rubbed with glycerol mono-oleate (GMO) that is a kind of additive, although it showed very low friction coefficient. To improve tribological properties, new additives were developed that had both phosphate-oxide structure derived from ZnDTP which had high wear resistance and hydroxy group derived from GMO in one structure. To clarify the effects of the additives, friction tests were performed fixed-roller-on-disk type rotating friction tester. In the friction tests, hydrogenated amorphous carbon (a-C:H) disks, and a-C:H coated rollers were used under boundary lubrication condition at 20-80°C. Friction tests were conducted in Poly-α-olefin (PAO) oil with each GMO and the additives. The results exhibited that a-C:H gave ultra-low friction with the additive. Elemental analysis of the surface showed that tribofilm of phosphorus and oxygen was detected on the a-C:H surface in the additive used condition.</p>

    DOI: 10.2474/trol.16.263

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  50. New study on tribological performance of AA7075-TiB2 nanocomposites Reviewed International coauthorship

    Pan Shuaihang, Saso Tomohiro, Yu Ning, Sokoluk Maximilian, Yao Gongcheng, Umehara Noritsugu, Li Xiaochun

    TRIBOLOGY INTERNATIONAL   Vol. 152   2020.12

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    DOI: 10.1016/j.triboint.2020.106565

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  51. The Clarification of Friction Mechanism in Oil Lubrication for CNx Coating by <i>In-Situ</i> Observation of Friction Area with Reflectance Spectroscopy Invited

    UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 65 ( 11 ) page: 684 - 687   2020.11

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    DOI: 10.18914/tribologist.65.11_684

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  52. ポリ塩化ビニル溶媒への交流電場援用マイクロプラスチック突起の創製 Reviewed

    山田雄聖,野老山貴行,村島基之,梅原徳次

    日本機械学会論文集   Vol. 86 ( 892 ) page: 20-00228   2020.11

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    DOI: https://doi.org/10.1299/transjsme.20-00228

  53. Re-Organization of Technical Support Staffs in Nagoya University Invited

    UMEHARA Noritsugu, KOGA Kazushi, FUJIWARA Fumiharu, SAWAKI Koji, YAMAMOTO Kouji, TACHIBANA Kazushi, MIZUGUCHI Ikuyo

    Journal of the Japan Society for Precision Engineering   Vol. 86 ( 9 ) page: 662 - 665   2020.9

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society for Precision Engineering  

    DOI: 10.2493/jjspe.86.662

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  54. The Clarification of Friction Mechanism for Carbonaceous Hard Coatings by <i>in-situ</i> Observation of Friction Area with Reflectance Spectroscopy Invited

    UMEHARA Noritsugu

    Journal of The Surface Finishing Society of Japan   Vol. 71 ( 9 ) page: 547 - 550   2020.9

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Surface Finishing Society of Japan  

    DOI: 10.4139/sfj.71.547

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  55. コーティング電気メス先端の炭化物付着抑制手法の開発 Reviewed

    野老山貴行,小林将大,村島基之,梅原徳次,小川航生,萬隆行,内田淳一

    日本機械学会論文集   Vol. 86   page: 20-00273   2020.9

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  56. Enhancement of speed of surface roughness improvement by using a two mixed abrasive slurry method to polish glass surfaces Reviewed

    TAKENO Hiroaki, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, UMEHARA Noritsugu, CHIBA Shogo

    Journal of the Japan Society for Abrasive Technology   Vol. 64 ( 8 ) page: 428 - 435   2020.8

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    <p>This study was performed to find a method to reduce the consumption of expensive diamond abrasive grains in polishing glass substrates, and to mix low-hardness abrasives with diamond abrasives to reduce costs and achieve early improvement of surface roughness. The effects of the size of the GC abrasives (approximately 127 μm, 75 μm, and 13 μm), abrasive concentration, and types of abrasives (WA and B<sub>4</sub>C) were clarified for low-hardness abrasives. The abrasive grains were fluorescently stained with rhodamine B to determine their behavior on the polished surface in-situ. The results indicated improved surface roughness by using two types of mixed abrasive grains. In addition, the large-grain GC abrasives moved or were shown to be trapped in the gaps of the fibers of the natural silk polishing pad used for polishing. On the other hand, diamond grains with an average grain size of 1.0 μm moved between the natural silk polishing pad and the glass substrate regardless of the fiber orientation.</p>

    DOI: 10.11420/jsat.64.428

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  57. 金ナノ粒子法を用いた表面増強ラマン分析による炭素系薄膜の極表面分析 Reviewed

    野老山貴行,梅原徳次,村島基之

    トライボロジスト   Vol. 65 ( 8 ) page: 517 - 525   2020.8

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  58. New study on tribological performance of AA7075-TiB2 nanocomposites Reviewed International coauthorship International journal

    Shualihang Pan, Tomohiro Saso, Ning Yu, Maximillan Sokoluk, Gongcheng Yao, Noritsugu Umehara, Xiaochun Li

    Tribology International   Vol. 152   page: 106565   2020.8

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    DOI: 10.1016/j.tribint.2020.106565

  59. The wear classification of MoDTC-derived particles on silicon and hydrogenated diamond-like carbon at room temperature Reviewed International journal

    K. A.M. Kassim, T. Tokoroyama, M. Murashima, N. Umehara

    Tribology International   Vol. 147   page: 106176   2020.7

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    Molybdenum dithiocarbamate (MoDTC) is well-known as a friction-modifier in engine oil but has wear accelerating effects on DLC/steel sliding contact. Since MoDTC was reported degradable to other materials, the effect of each material on wear acceleration has not been clarified yet. Therefore, it is necessary to divide which Mo-derived compound has a major role to enhance wear. Thus, powder-type MoDTC, MoO3, Mo2C, MoS2, and Mo were dispersed into Poly-alpha-olefin (PAO), and tested on a-C:H and Si-DLC against steel ball at room temperature. For Mo2C, MoDTC, and MoO3, the specific wear rate of a-C:H was approximately 3.4 × 10−5, 3.2 × 10−6 and 1.5 × 10−6 mm3/Nm, respectively. MoDTC indicated higher affection than MoO3 regardless of the particles’ hardness. Si-DLC showed better wear prevention compared to a-C:H.

    DOI: 10.1016/j.triboint.2020.106176

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  60. Effect of mesh structure of tetrahedral amorphous carbon (ta-C) coating on friction and wear properties under base-oil lubrication condition Reviewed International coauthorship International journal

    Mohd Muhyiddin Bin Mustafa, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima, Akinori Shibata, Yoshiharu Utsumi, Hideki Moriguchi

    TRIBOLOGY INTERNATIONAL   Vol. 147   page: 105557   2020.7

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    This study examined the tribological properties of novel mesh tetrahedral amorphous carbon (Mesh ta-C). Subsequently, comparison was made with conventional ta-C and a-C:H coatings under base-oil lubrication via cylindrical-pin-on-disk tribo-tester. Analysis of wear track was conducted using field-emission-scanning-electron-microscope (FE-SEM), atomic-force-microscopy (AFM), and Raman-spectroscopy. The friction coefficient for Mesh ta-C and conventional ta-C revealed a similar pattern with regard to loads. The Mesh ta-C had excellent wear resistance, where the wear rates at loads of 20 N was five and 20 times lower than conventional a-C:H and ta-C, respectively. High wear resistance of Mesh ta-C characterized by inhibition of brittle micro-fracture propagation, less in abrasive particle created during friction test, and suppressing the effect of graphitization-induced wear on the contact surface.

    DOI: 10.1016/j.triboint.2019.01.016

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  61. Effect of defects on wear behavior in ta-C coating prepared by filtered cathodic vacuum arc deposition Reviewed International coauthorship International journal

    Woo-Young Lee, Young-Jun Jang, Takayuki Tokoroyama, Motoyuki Murashima, Noritsugu Umehara

    DIAMOND AND RELATED MATERIALS   Vol. 105   page: 107789 - 107789   2020.5

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    This study examined the tribological behavior of a ta-C coating fabricated at a substrate bias of -100 V via filtered cathodic vacuum arc (FCVA) deposition. Defects in the ta-C coating were categorized as droplets, pores, and spikes, considering the morphological, structural, and mechanical properties of the ta-C surface. A friction test was conducted at 170 degrees C in ambient air using a ball-on-disk tribometer. The friction coefficient was 0.08 during the steady state and the wear rate was 4.3 x 10(-6) mm(3)/Nm. To explain the friction and wear behavior, the morphological and structural properties of the defects in the designated area were compared among different sliding cycles.

    DOI: 10.1016/j.diamond.2020.107789

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  62. The Surface Enhanced Raman Scattering Analysis for Carbonaceous Coating by Using Au Nano-Particles Reviewed International journal

    T. Takayuki, M. Murashima, N. Umehara

    TRIBOLOGY ONLINE   Vol. 15 ( 5 ) page: 300 - 308   2020.5

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  63. Tribology in Shaver

    TOKOROYAMA Takayuki, UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 65 ( 4 ) page: 236 - 241   2020.4

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    <p>From time immemorial, shaving one’s beard has been continued. Using razor or electric shaver is common for all male adult to show their cleanliness recently. The custom for shaving my beard by myself was harbingered by World War I and II. Tremendous safety razors were provided by US government to frontline infantry, then they acquired a custom of “shaving by myself”. An electric shaver was invented early of the 20<sup>th </sup>century, and it is divided two shaving motion, a rotation or a reciprocation. In this article, investigating the relation between inner blade’s edge radiuses and pulling force, clarifying differences of shaving mechanism of a rotation or a reciprocation type shaver by a high speed camera with measuring pulling force simultaneously are explained.</p>

    DOI: 10.18914/tribologist.65.04_236

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  64. New Droplet Removal Polishing Method for Diamond-Like Carbon with Carbon Fiber Brush Reviewed International journal

    Murashima Motoyuki, Imaizumi Yusuke, Umehara Noritsugu, Tokoroyama Takayuki

    International Journal of Automation Technology   Vol. 14 ( 2 ) page: 190 - 199   2020.3

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    <p>In this paper, we propose a new polishing method for diamond-like carbon (DLC) coatings using a carbon fiber brush (CFB). Surface finishing is an important process for DLC coating applications. A lapping process is widely used for attaining tetrahedral amorphous carbon (ta-C) coatings, which are a type of DLC coating containing many droplets, to obtain fine flat surfaces. The lapping process removes protuberant parts of droplets rather than the entire droplet. In this paper, we propose a new polish brush material made of carbon fiber, called CFB. Carbon fiber has both mechanical strength due to its hard carbonaceous material and flexibility due to its fiber structure. In polishing tests, CFB removed droplets from ta-C coatings and the removal effect increased with the shortening of the brush length. The surface profiles of the polished surfaces indicated that a shorter brush length yielded deep scratch marks on ta-C surfaces. Consequently, the arithmetic average surface roughness of the polished ta-C surfaces, <i>S</i><sub>a</sub>, had almost the same value as that of a non-polished surface. Here, we show the ability of CFB to remove the droplets without an increase in the surface roughness. The CFB with the longest brush length in the present study (12 mm) showed a ten-point average roughness <i>S</i><sub>ZJI<i>S</i></sub>= 75 nm and <i>S</i><sub>a</sub>= 4.7 nm, which were 59% and 22% lower than those of the non-polished surface, respectively. Furthermore, the longest CFB removed the entire droplets whereas a shorter CFB merely removed the protuberant part of the droplets. The result indicates that CFB polishing can remove entire droplets, which result in abrasive wear or deterioration. From other polishing tests, the optimum polishing distance was determined. Shorter polishing distances could not remove droplets sufficiently whereas longer polishing distances caused deep scratches on ta-C surfaces due to the material transferred to the CFB. Accordingly, the polishing distance of 600 m showed the best surface finishing with <i>S</i><sub>ZJIN</sub>= 25 nm and <i>R</i><sub>a</sub>= 0.43 nm, which were 86% lower than and similar to those of the non-polished ta-C surface, respectively.</p>

    DOI: 10.20965/ijat.2020.p0190

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  65. 二液分離油の反射分光摩擦面その場観察装置を用いたしゅう動部油膜その場分析 Reviewed

    山田高澄, 梅原徳次, 野老山貴行, 村島基之, 佐藤卓, 大原健司, 羽生田清志

    日本機械学会論文集   Vol. 86 ( 884 ) page: 1900315   2020.3

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    DOI: doi.org/10.1299/transjsme.19-00315

  66. ディーゼルエンジンオイル中ナノメートルサイズPMの交流電場による凝集を用いたろ過手法の開発 Reviewed

    野老山 貴行, 柴沢 穂高, 梅原 徳次

    日本機械学会論文集   Vol. 86 ( 884 ) page: 2000016   2020.3

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    DOI: doi.org/10.1299/transjsme.20-00016

  67. Development of Surface Roughness Generation Model for CFRTP Manufactured by LFT-D Reviewed International journal

    Murashima Motoyuki, Murooka Takaharu, Umehara Noritsugu, Tokoroyama Takayuki

    International Journal of Automation Technology   Vol. 14 ( 2 ) page: 208 - 216   2020.3

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    <p>In this study, we propose a new surface generation model for carbon fiber reinforced thermoplastics (CFRTP) manufactured by the long fiber thermoplastic-direct (LFT-D) method. CFRTP are considered to be a next-generation structural material because of their high productivity as well as high mechanical strength and lightness. Conversely, CFRTP have a rough surface, which does not meet the automotive outer panel standard of a “class A surface.” In the present study, we establish a surface roughness generation model based on a thermal shrinkage mismatch of thermoplastic resin to carbon fiber and non-uniform carbon fiber distribution. Furthermore, we construct a surface roughness estimation formula based on the model. In the calculation, a cross-sectional image of CFRTP is divided into many vertical segments. Subsequently, the thermal shrinkage of each segment is calculated with a standard deviation, an average, and a probability density of the amount of carbon fiber in each segment. The surface roughness of the manufactured CFRTP was measured using a surface profilometer. The result showed that the arithmetic surface roughness increased with the volume fraction of carbon fiber. We applied the surface roughness calculation to cross-sectional images of the specimens. Consequently, the estimated surface roughness showed the same tendency, in which the surface roughness increased with the volume fraction of carbon fiber. The slope of a regression line of the estimated surface roughness with respect to the volume fraction was 0.010, which was almost the same (0.011) as the slope of a regression line of the measured surface roughness. Furthermore, the estimation formula using a thermal shrinkage effective depth of 395 μm was able to estimate the surface roughness within a 3% average error. Using the estimation formula, it was predicted that the surface roughness increased with the standard deviation of the amount of carbon fiber in a segment. To confirm the reliability of the model and the formula, we measured the standard deviation of the amount of carbon fiber in CFRTP specimens, showing that the trend for CFRTP specimens matched the estimated values.</p>

    DOI: 10.20965/ijat.2020.p0208

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  68. Effect of Mating Material and Graphitization on Wear of a-C:H Coating in Boundary Base Oil Lubrication Reviewed International journal

    Kouami Auxence Melardot Aboua, Noritsugu Umehara, Hiroyuki Kousaka, Takayuki Tokoroyama, Motoyuki Murashima, Mohd Muhyiddin Bin Mustafa, Yutaka Mabuchi, Tsuyoshi Higuchi, Masahiro Kawaguchi

    Tribology Letters   Vol. 68 ( 1 ) page: 24   2020.1

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    Hydrogenated amorphous carbon (a-C:H) coating exhibits different wear behaviors depending on its counterpart material in boundary lubricated sliding contact. In previous works, tribological behaviors of a-C:H coating were investigated against steel, chromium, and germanium counterpart materials. The specific wear rate of a-C:H coating was found to decrease with the ability of its counterpart material to react with or dissolve carbon. The present study investigated how graphitization of a-C:H coating's top layers and interactions of the counterpart material with carbon influence wear behaviors of a-C:H coating in boundary lubrication. Results show that a-C:H coating shows graphitization of its top layers regardless the counterpart material. Correlation with differences in wear behaviors of the a-C:H coating leads to the conclusion that graphitization will induce high wear of a-C:H coating only when there are also atomic interactions between the DLC coating and its counterpart material.

    DOI: 10.1007/s11249-019-1248-6

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  69. EFFECTS OF LUBRICATION CONDITION ON FRICTION AND WEAR IN OIL LUBRICATION FOR ALUMINIUM ALLOY BEARINGS WITH VARIOUS CARBONACEOUS HARD COATINGS

    Umehara Noritsugu, Kitamura Tomoki, Tokoroyama Takayuki, Murashima Motoyuki

    7TH INTERNATIONAL CONFERENCE INTEGRITY-RELIABILITY-FAILURE (IRF2020)     page: 1045 - 1046   2020

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  70. The tribological property of DLC under lubrication with GDOP and GDTP additives having glycerin and phosphate structure

    KANI Takumi, TOKOROYAMA Takayuki, UMEHARA Noritsugu, MURASHIMA Motoyuki, YAGISHITA Kazuhiro

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2020 ( 0 ) page: S11311   2020

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    <p>In general, several mechanical parts are subjected to friction and wear. To prevent unfavorable wear and high friction coefficient, additives can work to reduce friction force, to build up thin film on the surfaces which is so-called tribofilm. Recently, Diamond-Like Carbon (DLC) is focused because it has excellent low friction and high wear proof as solid lubricant. However, several researchers already reported that ta-C showed abnormal wear when it rubbed with GMO that is a kind of additive, although it showed very low friction coefficient. To improve friction property, GDTP and GDOP was developed that has structure of GMO and dithio-phosphate functional group derived from ZnDTP which has high wear resistance. To clarify the effects of GDOP, we performed XPS analysis after the friction tests. In the friction tests, an a-C:H coating, and SUJ2 balls were used under boundary lubrication condition at 20, 50 and 80 ℃, and applying normal load was 1 N. Friction tests were conducted in PAO (Poly-α-olefin) oil, PAO with each GMO, GDTP and GDOP additives. In PAO with GDOP situation, the friction coefficient decreased down to 0.05. And the specific wear rate of SUJ2 ball was larger than with GMO and GDTP. The result of XPS analysis, although the binding energy of PO<sub>4</sub> was observed, that of FePO4 was hardly observed. This suggests that when GDOP was added, the tribofilm that increased friction coefficient was not formed because PO4 and Fe hardly reacted. As a result, the wear of an SUJ2 ball was small volume.</p>

    DOI: 10.1299/jsmemecj.2020.s11311

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  71. "FRICTIONLESS" DIAMOND-LIKE COATINGS AND IN-SITU OBSERVATION USING REFLECTANCE SPECTROSCOPY

    Umehara, N

    7TH INTERNATIONAL CONFERENCE INTEGRITY-RELIABILITY-FAILURE (IRF2020)     page: 7 - 8   2020

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  72. The Surface Enhanced Raman Scattering Analysis for Carbonaceous Coating by Using Au Nano-Particles Reviewed

    Tokoroyama Takayuki, Murashima Motoyuki, Umehara Noritsugu

    Tribology Online   Vol. 15 ( 5 ) page: 300 - 308   2020

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    <p>In general, Raman analysis is one of the useful candidates to obtain structure of carbonaceous coatings. To improve the depth resolution of Raman analysis, surface-enhanced Raman Scattering (SERS) using gold nanoparticles (Au nanoparticles: AuNPs) and Au sputtered particles were investigated. The analysis was conducted to approximately 1.7, 2.4, 4.7, and 10.0 nm thickness of carbon coatings on silicon substrate with a 532 nm incident wavelength laser. The results indicated that the underlying silicon substrate was detected in the results of the Au sputtering method. Contrastingly, the underlying silicon substrate was not detected by the AuNPs method. This result clarified that using the AuNPs method, the detection depth of the carbon film was approximately 1.7 nm or less. The a-C:H coating was processed using a calotester, and SERS measurements at different depths were performed for the 633 and 532 nm wavelengths using the AuNPs method. As a result, the <i>I</i><sub>G</sub><i> </i>peak position tended to increase from the vicinity of the inter face between the a-C:H coating and the substrate to the surface. In addition, the <i>I</i><i><sub>D</sub></i><i>/I</i><sub>G</sub> ratio was as low as 0.28 near the substrate and 0.72 at 3800 nm.</p>

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  73. Effect of doped tantalum in ta-CNx film or tantalum as counterpart material on the friction and wear properties of ta-CNx Reviewed

    HOJO Koki, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki

    Transactions of the JSME (in Japanese)   Vol. 86 ( 888 ) page: 20-00018 - 20-00018   2020

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    <p>In order to clarify the effect of Ta (tantalum) content on the friction and wear characteristics of the ta-CNx (tetrahedral amorphous carbon nitride) coating, an IBA-FAD (Ion Beam Assisted Filtered Arc Deposition method) was applied to generate hard carbonaceous coating to achieve low friction coefficient in ambient air. Following research works clarified that Ta containing carbon nitride (CNx:Ta) showed friction coefficient lower than 0.05 in ambient air, however, the coating only had around 10 GPa hardness which was assumed to be soft in industrial fields. To confirm Ta containing to the ta-CNx coating on friction and wear properties, ta-CNx:Ta coating was synthesized by IBA-FAD and an arc plasma gun which supplied different amount of Ta by using pulse discharge technique (100 or 200 pulse/min.). The hardness of ta-CNx was approximately 54 GPa, then the hardness of Ta containing ta-CNx became softer than ta-CNx such as approximately 33 GPa (ta-CNx:Ta200). After the ball-on-disk friction test between those coatings and SUJ2 disk, a specific wear rate of those coatings did not along with its hardness. From the XPS (x-ray photoelectron spectroscopy) analysis, oxygen/carbon ratio of the topmost coating surface decreased by containing Ta. Those results implied that Ta in the coating may have a possibility to prevent oxidation of carbonaceous coating. The friction coefficient of ta-CNx, ta-CNx:Ta100 and ta-CNx:Ta200 showed around 0.15 during friction test. To confirm the importance of Ta transformed layer on low friction property, friction test between ta-CNx coating and thin Ta coated SUJ2 disk was conducted. The friction coefficient of the pair became the lowest among them which value was approximately 0.08.</p>

    DOI: 10.1299/transjsme.20-00018

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  74. Preventing coagulated-blood adhesion on a coated electrosurgical knife Reviewed

    TOKOROYAMA Takayuki, KOBAYASHI Masahiro, MURASHIMA Motoyuki, UMEHARA Noritsugu, OGAWA Koki, YOROZU Takayuki, UCHIDA Junichi

    Transactions of the JSME (in Japanese)   Vol. 86 ( 889 ) page: 20-00273 - 20-00273   2020

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    <p>In the past several decades, electro medical equipment has been developing to enhance surgical technologies. Using electro surgical knife is very common in everywhere of medical scene now a days. An electro surgical knife is consisted with power supply, metal tip and return electrode. In the case of using it to stop bleeding by coagulation mode, the tip surface is frequently covered by coagulated blood, then it is not able to discharge again. It means that the surgeons should replace it to new metal tip to continue surgical operation. In order to overcome this problem, some tips are covered by silicon type coating to prevent coagulated blood adhesion. However, it still has problems of continuous using, low heat invasiveness for human organs and how design such tip surface. In this study, three different type coating tips and a non-coated tip were prepared to compare temperature rising abilities and coagulated blood adhesion on the surface. As a result, fully surface coated types and blade’s edge uncovered type realized excellent prevention ability of blood coagulation adhesion onto surface. Especially for the side edge uncovered type, it exhibited low temperature rising ability after the temperature exceeded 100 degree C. This result indicated that side edge uncovered type is one of the suitable design to prevent exceed temperature rising.</p>

    DOI: 10.1299/transjsme.20-00273

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  75. In –situ analysis of two phase lubricant oil film with a reflectance spectroscopy Reviewed

    YAMADA Takazumi, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, SATO Taku, OHARA Kenji, HANYUDA Kiyoshi

    Transactions of the JSME (in Japanese)   Vol. 86 ( 884 ) page: 19-00315 - 19-00315   2020

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    <p>Two phase lubricant has attracted attention as a lubricating oil with little change in viscosity with temperature change. The two phase lubricant consist of the low and high viscosity base oils which are miscible at high temperature but not at lower temperature. For exmaple, Mineral or synthetic base oil are used as a low viscosity lubricant and PAG(polyalkylene glycol). In the high temperature region, PAG dissolves into mineral or synthetic base oil and the viscosity reduction is relieved. However, the structure and frictional characteristics of the oil film at the sliding part have not been elucidated. In this paper, in-situ analysis of the oil film formed on the friction surface was carried out with a reflection spectroscopic film thickness meter. And, this paper clarified the influence of the oil film structure and oil film thickness of the two phase lubricant and its friction characteristics. As a result, it was suggested that the oil film of the two phase lubricant in the sliding part was a multilayer due to the adsorption layer of PAG. In addition the two phase lubricant showed a friction coefficient lower by about 0.03 to 0.07 at the experimental temperature compared to PAO, and it was clarified that a thick oil film was formed.</p>

    DOI: 10.1299/transjsme.19-00315

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  76. The micro-meter-sized plastic asperities by AC electric field for Poly-vinyl chloride solvent Reviewed

    YAMADA Yusei, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, UMEHARA Noritsugu

    Transactions of the JSME (in Japanese)   Vol. 86 ( 892 ) page: 20-00228 - 20-00228   2020

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    <p>In order to create an inexpensive micrometer-sized plastic asperities, a polyvinyl chloride solvent dissolved in acetone was prepared so that the solvent droplet was put on silicon substrate and placed between parallel plate electrodes (the gap was 5 mm). The effects of concentration, DC/AC and their combination voltage on the creation of micrometer-sized plastic asperities were clarified. As a result, asperities with a height of more than 10 μm were observed from a solvent concentration more than 2.51 mg/ml. It was found that the asperities height increased linearly from around 10 μm to 14 μm with the applied voltage of 0.1 kV to 2.0 kV between the parallel plate electrodes. The effect of DC or AC of 2.0 kV on asperities height and number per unit area were conducted, then the height of asperities decreased from 14 μm to 10 μm when frequency was applied to 11 Hz. To confirm the effect of applying AC voltage on motion of the solvent droplet, high-speed camera observation was carried out. It was revealed that the droplet oscillated by applied AC voltage between parallel plates. The dimensionless height of the droplet increased and reached a maximum at AC 11 Hz. Finally, to clarify the effect of the initial voltage application method on the formation of asperities, a voltage was applied between the parallel plate electrodes under the conditions of DC/AC and no voltage for an initial evaporation time of 3 min. By applying AC 11 Hz during solvent evaporation period, it was clarified that the asperities dispersed most on the surface, then variations in asperities height were reduced.</p>

    DOI: 10.1299/transjsme.20-00228

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  77. The development of nano-sized PM filtration for a diesel engine oil using coagulation by an alternating electric field Reviewed

    TOKOROYAMA Takayuki, SHIBASAWA Hotaka, UMEHARA Noritsugu

    Transactions of the JSME (in Japanese)   Vol. 86 ( 884 ) page: 20-00016 - 20-00016   2020

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    <p>In general, a diesel engine does not have ignition system and it can ignite by self-ignition. It has pros that engine manufactures can consist engine components less than normal gasoline engines. However, diesel engines emit more particle matter (PM) rather than normal gasoline engine, so that diesel engines should have diesel particulate filter (DPF) to accumulate them even if it is in not only a exhaust gas but also an engine oil region. In this study, the authors clarified the possibility of PM accumulation method by using an alternating electric field applying between a metal needle and a plate to coagulate them as large particles more than 0.8 μm. The important parameters were an electric field intensity, frequency and applying time. The FESEM observation results indicated that approximately 100 nm-sized particles coagulated to be a large particle. Then, EDS analysis revealed that the particle did not include conventional engine additives such as zinc, molybdenum and calcium. Those results clearly indicated that the alternative electric field method can accumulate nano-sized PM.</p>

    DOI: 10.1299/transjsme.20-00016

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  78. Intelligent tribological surfaces: from concept to realization using additive manufacturing Reviewed International journal

    M. Murashima, S. Yoshino, M. Kawaguchi, N. Umehara

    Int J Mech Mater Des   Vol. 15 ( 4 ) page: 757 - 766   2019.12

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    DOI: 10.1007/s10999-018-9435-4

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  79. Investigating running-in behavior to understand wear behavior of ta-C coating with filtered cathodic vacuum arc deposition Reviewed International coauthorship International journal

    Woo-Young Lee, Takayuki Tokoroyama, Motoyuki Murashima, Noritsugu Umehara

    JURNAL TRIBOLOGI   Vol. 23   page: 38 - 47   2019.12

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    In this study, to clarify running-in cycle and role of carbon transfer layer on wear, ta-C coatings were subjected to friction tests under 200 degrees C in air with a different sliding cycles. The steady state friction coefficient of 0.02 was obtained after finishing a running-in cycles approximately 2,000 cycles. During the steady state, wear rate of ta-C decreased with increasing number of cycles. Such the decrease of wear rate was explained by polished defects presented on surface and form carbon transfer layer on the counter-part material. The mechanism of those tribological properties was analyzed by Raman spectroscopy, scanning electron microscope observation and 3D measuring laser microscope.

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  80. The tribological potential of graphene growth from solid waste Reviewed International coauthorship International journal

    Noor Ayuma Mat Tahir, Fakulti Kejuruteraan Mekanikal, Mohd Fadzli Bin Abdollah, Noreffendy Tamaldin, Hilmi Amiruddin, Mohd Rody Bin, Mohamad Zin, Takayuki Tokoroyama, Noritsugu Umehara

    Progress in Industrial Ecology   Vol. 13 ( 4 ) page: 401 - 413   2019.9

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  81. Effect of Carbon Diffusion on Friction and Wear Behaviors of Diamond-Like Carbon Coating Against Germanium in Boundary Base Oil Lubrication Reviewed International coauthorship International journal

    Kouami Auxence Melardot Aboua, Noritsugu Umehara, Hiroyuki Kousaka, Takayuki Tokoroyama, Motoyuki Murashima, Yutaka Mabuchi, Tsuyoshi Higuchi, Masahiro Kawaguchi

    Tribology Letters   Vol. 67 ( 2 ) page: 65   2019.6

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    Diamond-like carbon (DLC) coatings are designed to work under severe lubrication conditions. Depending on working environment, lubrication condition, and counterpart material, DLC coatings can exhibit crucial variations in their tribological behaviors. In the search of a counterpart material to improve tribological performances of DLC coatings in desired environment, we found out in previous work that carbon diffusion is an important parameter that influences the tribological behaviors of amorphous hydrogenated (a-C:H) coating in boundary lubrication. a-C:H coating exhibits high wear against steel counterpart material that has a high carbon affinity/solubility, while its exhibits lower wear against chromium counterpart material that has lower carbon affinity/solubility than steel. These recent findings imply that consideration of the carbon affinity/solubility when choosing a counterpart material for a-C:H coating in boundary lubrication might be of significant importance to improve tribological performances of a-C:H coating. This research investigates tribological behaviors of a-C:H coating against germanium counterpart material that has extremely low carbon affinity/solubility. Results show that there is no atomic interaction between a-C:H coating and germanium during friction and wear test, followed with a very low wear of a-C:H coating.

    DOI: 10.1007/s11249-019-1179-2

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  82. The tribological potential of graphene growth from solid waste Reviewed International coauthorship

    Noor Ayuma Mat Tahir, Fakulti Kejuruteraan Mekanikal, Mohd Fadzli Bin Abdollah*, Noreffendy Tamaldin, Hilmi Amiruddin, Mohd Rody Bin Mohamad Zin, Takayuki Tokoroyama and Noritsugu Umehara

    Progress in Industrial Ecology – An International Journal   Vol. 13 ( 4 ) page: 401 - 413   2019.4

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  83. Effect of oxygen on degradation of defects on ta-C coatings deposited by filtered arc deposition Reviewed International journal

    Murashima Motoyuki, Deng Xingrui, Izuoka Hiroto, Umehara Noritsugu, Kousaka Hiroyuki

    SURFACE & COATINGS TECHNOLOGY   Vol. 362   page: 200 - 207   2019.3

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    DOI: 10.1016/j.surfcoat.2019.01.115

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  84. Tribological properties of ta-CNx coating sliding against steel and sapphire in unlubricated condition Reviewed International journal

    Xiaoxu Liu, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima

    TRIBOLOGY INTERNATIONAL   Vol. 131   page: 102 - 111   2019.3

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    Tribo-behavior of tetrahedral amorphous carbon nitride (ta-CNx) coating in unlubricated condition was investigated in this study. Sliding against steel, low nitrogen content ta-CNx exhibits much lower friction and wear as temperature increases, with less adhesion wear than ta-C and remained relatively higher hardness (45.01 GPa). Nevertheless, against sapphire ta-C outperforms ta-CNx greatly, and graphitization could be found at 120 degrees C. With atmosphere humidity increasing, ta-CNx shows significantly decreased friction, implying the tribo-character of high sp(3) bonding structure. Meanwhile, dry air seems to be the harshest condition for ta-CNx, since O-2 in the atmosphere might lead to oxidized wear of ta-CNx even under room temperature. Furthermore, in humid N-2, as an inert gas with high humidity, ta-CNx shows the lowest friction and wear.

    DOI: 10.1016/j.triboint.2018.10.022

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  85. Processing thin (<10 µm), dense, flexible α-Al<sub>2</sub>O<sub>3</sub> films from nanopowders Reviewed International coauthorship International journal

    TAKEUCHI Makoto, NIEDERMAIER Matthias, JANSOHN Monika, UMEHARA Noritsugu, LAINE Richard M.

    Journal of the Ceramic Society of Japan   Vol. 127 ( 2 ) page: 81 - 89   2019.2

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    <p>Normally, it is very difficult to process thin ceramic films (<10 µm) except by vapor deposition methods. This is because in traditional ceramics processing, initial powder particle sizes (typical average particle sizes, APSs >200 nm) make it difficult to realize mechanically robust thin films after sintering to full density due to excessive grain growth. One solution to this problem is to start with nanopowders (APSs <100 nm). Here we present efforts to use simple, easily available nano δ-Al<sub>2</sub>O<sub>3</sub> (transition or <i>t</i>-Al<sub>2</sub>O<sub>3</sub>) nanopowders (NPs) to process the subject films. Thus <i>t</i>-Al<sub>2</sub>O<sub>3</sub> NPs when properly dispersed, doped with 0.5–5 wt.% MgO and ball milled with a polymeric binder provide castable systems. Wire wound roller drawing/tape casting provides access to <i>thin green films</i> (10–30 µm) with ≈75 wt.% ceramic loadings. Following binder burnout and careful sintering to temperatures of up to 1500°C/7 h/air but preferably slightly lesser conditions leads to dense ≤10 µm films with average α-Al<sub>2</sub>O<sub>3</sub> grain sizes of 500–800 nm. At higher MgO concentrations, spinel phase separates during sintering likely inhibiting grain growth. These relatively dense films are flexible and translucent. Such films, because of their flexibility, may offer utility as catalyst supports, electronic substrates or as hard facings for other materials.</p>

    DOI: 10.2109/jcersj2.18099

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  86. The clarification of low friction mechanism in base oil lubrication of ta-CNx coating by in-situ observation with reflectance spectroscopy Reviewed

    OKAMOTO Tatsuya, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki

    Transactions of the JSME (in Japanese)   Vol. 85 ( 875 ) page: 19-00071 - 19-00071   2019

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    <p>Among DLC (Diamond-Like Carbon), ta-C (tetrahedral amorphous Carbon) coatings have been applied to improve fuel efficiency in automobile engines. Furthermore, it has been reported that a ta-CNx (tetrahedral amorphous Carbon Nitride) coating showed more than 50% lower friction coefficient in base oil lubrication compared to ta-C coating. On the other hand, the low friction mechanism of the ta-CNx coating has not been clarified. From the previous research, low friction mechanism of the ta-CNx coating in oil lubrication is considered that the increment of oil film thickness in accordance with increasing the oiliness of the transformed layer is important. However, the effects of oil film thickness and oiliness of the transformed layer on friction coefficient have not been quantitatively clarified, because oil film thickness and oiliness of the transformed layer have not been measured during friction. Therefore, in this research, the objective was set to clarify the low friction mechanism of the ta-CNx coating in oil lubrication by in-situ observation with reflectance spectroscopy, and oil film thickness and physical properties (polarizability, chemical bonding fraction) of the transformed layer was measured by in-situ observation with reflectance spectroscopy. Using in-situ observation with reflectance spectroscopy, film thickness, refractive index <i>n</i> and extinction coefficient <i>k</i> can be measured during friction test. And polarizability and chemical bonding fraction of the transformed layer were estimated from refractive index and extinction coefficient. From in-situ observation with reflectance spectroscopy, low friction mechanism of the ta-CNx coating in oil lubrication was proposed as shown below. The transformed layer was formed during friction and the polarizability of the transformed layer increased in accordance with decreasing C-Csp<sup>2</sup> bonding fraction of the transformed layer, and PAO4 oil molecules were physically adsorbed on the transformed layer. As a result, oil film thickness increased and low friction occurred.</p>

    DOI: 10.1299/transjsme.19-00071

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  87. Effect of Pillar and Mesh Structure of Tetrahedral Amorphous Carbon (ta-C) Coatings on the Wear Properties and Fracture Toughness of the Coating Reviewed International coauthorship International journal

    Bin Mustafa Mohd Muhyiddin, Umehara Noritsugu, Tokoroyama Takayuki, Murashima Motoyuki, Shibata Akinori, Utsumi Yoshiharu, Moriguchi Hideki

    Tribology Online   Vol. 14 ( 5 ) page: 388 - 397   2019

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    <p>Wear by fracture is among the factors associated with the DLC coating failures in the tribological application. The current study investigated the link between the wear and the fracture-toughness on the novel Pillar and Mesh structure ta-C coatings, in addition to conventional ta-C coatings. The tribological properties of these coatings were examined under base-oil lubrication via ball-on-disk tribo-tester and micro indentation technique was used to characterize the fracture toughness. The wear track and the indentation mark were analyzed using the optical microscope, 3D laser microscope and FE-SEM. The friction coefficient for ta-C, Pillar ta-C and Mesh ta-C are within the range of 0.071 to 0.106. Mesh ta-C indicated the highest wear resistance, followed by the Pillar ta-C and conventional ta-C. Also, Mesh ta-C demonstrated the highest fracture-toughness value with 16.6 MPa·m<sup>1/2</sup>, followed by Pillar ta-C with 13.4 MPa·m<sup>1/2</sup> in contrast to ta-C. Greater resistance to wear for ta-C with Pillar and Mesh structure was detected with an increased fracture-toughness and improvement in crack propagation inhibition. Moreover, the Pillar and Mesh ta-C provides superior rate of crack-energy dissipation as compared to the ta-C.</p>

    DOI: 10.2474/trol.14.388

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  88. The tribological potential of graphene growth from solid waste Reviewed International coauthorship International journal

    Tahir N.A.M., Abdollah M.F.B., Tamaldin N., Amiruddin H., Zin M.R.B.M., Tokoroyama T., Umehara N.

    Progress in Industrial Ecology   Vol. 13 ( 4 ) page: 401 - 413   2019

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    This study aimed to identify the tribological potential of graphene growth from solid waste products on copper substrate via the chemical vapour deposition method. The study focused on graphene growth from fruit cover plastic waste (FCPW) and oil palm fibre (OPF), the graphene structure was zexamined using Raman spectroscopy. Then, the tribological testing was performed using a ball-on-disc tribometer, and the hardness was performed using a nano-indenter on both the worn and unworn surfaces. The results show that graphene was successfully grown from both sources. Meanwhile, the tribological study found that both coatings showed a higher coefficient of friction (μ) compared to pure copper. However, the wear rate (k) was contradicted by the μ where the k was found to be 60% to 75% lower than pure copper. Finally, the hardness analysis revealed that the coating was damaged at 100 m sliding as the surface hardness increased.

    DOI: 10.1504/PIE.2019.102864

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  89. Investigating running-in behavior to understand wear behavior of ta-C coating with filtered cathodic vacuum arc deposition Reviewed International coauthorship International journal

    Lee W.Y., Tokoroyama T., Murashima M., Umehara N.

    Jurnal Tribologi   Vol. 23   page: 38 - 47   2019

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    In this study, to clarify running-in cycle and role of carbon transfer layer on wear, ta-C coatings were subjected to friction tests under 200 °C in air with a different sliding cycles. The steady state friction coefficient of 0.02 was obtained after finishing a running-in cycles approximately 2,000 cycles. During the steady state, wear rate of ta-C decreased with increasing number of cycles. Such the decrease of wear rate was explained by polished defects presented on surface and form carbon transfer layer on the counter-part material. The mechanism of those tribological properties was analyzed by Raman spectroscopy, scanning electron microscope observation and 3D measuring laser microscope.

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  90. Effect of Carbon Diffusion on Friction and Wear Behaviors of Diamond-Like Carbon Coating Against Cr-Plating in Boundary Base Oil Lubrication Reviewed International journal

    Aboua Kouami Auxence Melardot, Umehara Noritsugu, Kousaka Hiroyuki, Tokoroyama Takayuki, Murashima Motoyuki, Mabuchi Yutaka, Higuchi Tsuyoshi, Kawaguchi Masahiro

    Tribology Online   Vol. 13 ( 5 ) page: 290 - 300   2018.12

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    <p>Investigations on tribological behaviors of Diamond-like Carbon (DLC) coating against other materials are strongly needed for scientific and industrial purposes. Recently, carbon diffusion has been found to play a key role in the wear of hydrogenated amorphous carbon (a-C:H) DLC coating when it is rubbed against steel counterpart material in boundary lubrication. Chromium has been reported to decrease carbon diffusion due to increase of the activation energy. In this research, we investigated on the effects of carbon diffusion on friction and wear properties of a-C:H coating when rubbed against Cr plating material. Results show that compared to steel counterpart, a-C:H coating exhibits lower friction coefficient, lower wear rate, and lower carbon diffusion rate when rubbed against Cr plating counterpart.</p>

    DOI: 10.2474/trol.13.290

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  91. The Clarification of Friction Mechanism in Oil Lubrication for CN<i>x </i>Coating by <i>In-Situ </i>Observation of Friction Area with Reflectance Spectroscopy Reviewed

    OKAMOTO Tatsuya, UMEHARA Noritsugu, MURASHIMA Motoyuki, SAITO Koji, MANABE Kazuyoshi, HAYASHI Keiji

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 63 ( 11 ) page: 755 - 767   2018.11

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    <p>To clarify the low friction mechanism of CN<i>x </i>coating in PAO oil lubrication, we measured reflectance spectrum at friction area <i>in-situ </i>by reflectance spectroscopy during friction test against a sapphire hemi-sphere pin in PAO oil. We observed and estimated thickness of PAO oil film, surface roughness of CN<i>x </i>coating, thicknesses and polarizability of transformed layer formed on bulk CN<i>x </i>coating during friction test by analyzing reflectance spectrum. We proposed that the decreasing of load ratio of boundary lubrication mode to total load is the one of governing factor to reduce friction on the basis of the increasing of Λ value. Also we proposed the increasing of adsorption of PAO oil to the CN<i>x </i>transformed layer is the second governing factor on the basis of the increasing of polarizability of PAO oil and transformed layer, that leads to the increasing of van der Waals force between transformed layer and PAO oil as low friction mechanism of CN<i>x </i>in PAO oil lubrication.</p>

    DOI: 10.18914/tribologist.17-00023

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  92. Effect of ZnDTP Triboflim's Morphology on Friction Behaviors of DLC Coatings: Tribofilm Characterization by 3D Scanning Electron Microscope Observation Reviewed International coauthorship

    K. A. M. Aboua, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, H. Abdullah Tasdemir, Y. Mabuchi, T. Higuchi

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   Vol. 12 ( 7 )   2018.11

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  93. Deposition of ta-C:B Coating by FCVA Using Boron Doped Target and Its Tribological Behaviors at Elevated Temperature up to 300℃ Reviewed

    NEMOTO Kouki, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, TAKIMOTO Yuji, NAKAMICHI Kenji

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 63 ( 10 ) page: 699 - 705   2018.10

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    <p>Boron doped tetrahedral amorphous carbon (ta-C:B) coatings were deposited with Filtered Cathodic Vacuum Arc (FCVA) method using boron doped graphite target (B=0, 5 and 10 at. %). The material properties and tribological properties of ta-C:B coatings were obtained at 23~300℃. The amount of boron contents in ta-C:B coatings are from 0 to 5.1 at. %, and the hardness of coatings ware more than 30 GPa. The friction coefficient of ta-C:B3.1 at 300℃ is about 0.02 in air. The specific wear rate of ta-C:B coating were lower than normal ta-C coating by 34% and 46% for ta-C:B<sub>3.1</sub> and ta-C:B<sub>5.1</sub>, respectively. The sp<sup>2</sup>/(sp<sup>2</sup>+ sp<sup>3</sup>) ratio measured by XPS and O/C ratio measured by AES increased through the friction at 300℃ for ta-C, on the other hand both values did not change for ta-C:B. Friction coefficients of ta-C:B<sub>3.1</sub> were shown as 0.055 at 23℃ and about 0.02 at 100~300℃. The specific wear rate of ta-C:B<sub>3.1</sub> at 23~300℃ in air was about 2.0 × 10<sup>−6 </sup>mm<sup>3</sup>/Nm. From these results, we confirmed that ta-C:B shows lower friction and higher specific wear resistance at 23~300℃ in air than ta-C.</p>

    DOI: 10.18914/tribologist.18-00003

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  94. The effects of oil additives and mating materials to the friction, wear and seizure characteristics of a-C:H coating Reviewed International coauthorship International journal

    Mohd Taufik bin Taib, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima

    JURNAL TRIBOLOGI   Vol. 18   page: 1 - 19   2018.9

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    In this study, friction and wear behaviour of amorphous hydrogenated carbon (a-C:H) DLC coating slide against SUJ2, TiC and TiN mating material disks in Base and ZnDTP+MoDTC oils boundary lubrication is comparatively investigated to determine the most favourable DLC/mating material/lubricant and interrelated tribofilm formation mechanism on each mating mating materials. Tribological tests were executed by utilizing roller on disk friction tester, nano-indentation hardness test, 3D optical surface profiler, and EDS-SEM were used to characterize the tribofilm formed on both worn roller and disk surfaces. The results showed that the wear volume of a-C:H/TiC tribo-pair in ZnDTP+MoDTC marked a tremendous wear volume reduction compared to than that of in Base oil. EDS investigation on tribofilm element investigation revealed that SUJ2 and TiN mating material disk attracted high concentration of Molybdenum at% on its surface that later caused high wear volume on both roller and disk sliding surfaces. TiC mating material disk however, formed a low at% yet helpful tribofilm consisting of a fraction of Zn phosphate from ZnDTP attached on both roller and disk which assisted the reduction of wear volume.

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  95. The Effect of UV Irradiation to a-C:H on Friction and Wear Properties under PAO Oil Lubrication Including MoDTC and ZnDTP Reviewed International journal

    bin Taib Mohd Taufik, Umehara Noritsugu, Tokoroyama Takayuki, Murashima Motoyuki

    Tribology Online   Vol. 13 ( 3 ) page: 119 - 130   2018.7

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    <p>One of the solutions to reduce friction between two sliding surfaces in automobile engine is by applying DLC coating to engine components. However, it is critical that the effect of lubricant additives to DLC coating to be clarified before hands as to avoid components failure. In this study, tribological friction test between SUJ2 balls and as-deposited plus UV irradiated a-C:H coatings was conducted to clarify the effect of ultraviolet irradiation to DLC coating in four different additives added lubricant oils. AFM, nano-indentation hardness test, ellipsometery, Zygo, and EDS-SEM were used to investigate the effect of UV irradiation to a-C:H DLC before and after friction test. Prior the friction test, the results showed that UV irradiation presented no significant change in terms of hardness and roughness but the irradiation did penetrate into topmost surface of the a-C:H coating to several degree and created dangling bonds available to interact with lubricant additives elements. Friction test results showed that UV irradiated a-C:H coatings presented lower friction coefficient than as deposited a-C:H coatings. Worn surface analysis revealed that UV irradiated a-C:H coatings attracted more lubricant additives element to attach on its surface thus created thicker tribofilm on its own surface and its counter materials, resulted in lower friction coefficient than the as-deposited a-C:H coatings.</p>

    DOI: 10.2474/trol.13.119

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  96. Chemical modification at and within nanopowders: Synthesis of core-shell Al2O3@TiON nanopowders via nitriding nano-(TiO2)(0.43)(Al2O3)(0.57) powders in NH3 Reviewed International coauthorship International journal

    You Fei, Sun Kai, Yi Eongyu, Nakatani Eitaro, Umehara Noritsugu, Laine Richard M

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Vol. 101 ( 4 ) page: 1441 - 1452   2018.4

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    DOI: 10.1111/jace.15303

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  97. Effect of nanoparticles as lubricant additives on friction and wear behavior of tetrahedral amorphous carbon (ta-C) coating Reviewed

    Li Xiang, Murashima Motoyuki, Umehara Noritsugu

    JURNAL TRIBOLOGI   Vol. 16   page: 15-29   2018.3

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  98. Effect of nanoparticles as lubricant additives on friction and wear behavior of tetrahedral amorphous carbon (ta-C) coating Reviewed International coauthorship International journal

    Li Xiang, Murashima Motoyuki, Umehara Noritsugu

    JURNAL TRIBOLOGI   Vol. 16   page: 15-29   2018.3

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  99. Effect of Substrate Bias and Temperature on Friction and Wear Properties for ta-C Coating Prepared under Different Substrate Bias Voltages with Filtered Cathodic Vacuum Arc Deposition Reviewed International coauthorship International journal

    Lee Woo-Young, Tokoroyama Takayuki, Jang Young-Jun, Umehara Noritsugu

    Tribology Online   Vol. 13 ( 5 ) page: 241 - 247   2018

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    <p>In this paper, the tribological behaviors of 1 μm of tetrahedral amorphous carbon (ta-C) coatings deposited with a different substrate bias of -0 V, -100 V and -300 V are examined under elevated temperature up to 600°C. It is found that wear behavior could be divided into two distinct regions according to testing temperature. The variation trend of the specific wear rate of ta-C coatings in region I at 23, 100 and 200°C are affected by abrasive particles which coincide with sp<sup>3</sup> content of ta-C coatings. In region II at 300, 400 and 500°C, the transfer layer play a major role in reduction of wear rate as a function of substrate bias.</p>

    DOI: 10.2474/trol.13.241

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  100. Collecting micrometer-sized wear particles generated between DLC/DLC surfaces under boundary lubrication with an electric field

    TOKOROYAMA Takayuki, KAMIYA Toru, AFMAD Nazeef Afifi Bin Hafiz, UMEHARA Noritsugu

    Mechanical Engineering Letters   Vol. 4 ( 0 ) page: 18-00089 - 18-00089   2018

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    <p>Carbonaceous coatings such as Diamond-Like Carbon (DLC) are attractive candidates for reducing friction under boundary lubrication. However, the wear particles generated from the DLC are believed to form hard slurries that scratch surfaces like an abrasive, and they can shorten the lifetime of the DLC itself. Generally, in conventional automobiles, these wear particles are collected by oil filters. Modern engine bearings are required to reduce the friction coefficient to low levels so that low-viscosity lubricants are used to reduce resistance to flow. However, using a low-viscosity lubricant result in direct solid contact between surfaces, which disrupts the hydrodynamic lubrication and generates numerous wear particles. In this study, we carried out friction tests between DLC/DLC surfaces with kerosene as a boundary lubricant at room temperature. The friction tests were conducted over 12,000 cycles, and we replaced the lubricant after every 2000 cycles without changing the contact pair. Wear particles were collected from the lubricant using an electric field with the electrophoresis effect. The wear particles gathered near the positive electrode and fell onto a glass plate. Finally, after the kerosene evaporated, scanning electron microscope and laser optical microscope observations showed the relations between particle size and shape, the number of wear particles, and the friction coefficient.</p>

    DOI: 10.1299/mel.18-00089

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  101. Effect of ZnDTP triboflim's morphology on friction behaviors of DLC coatings: Tribofilm characterization by 3D scanning electron microscope observation Reviewed International journal

    ABOUA Kouami Auxence Melardot, UMEHARA Noritsugu, KOUSAKA Hiroyuki, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, TASDEMIR Haci Abdullah, MABUCHI Yutaka, HIGUCHI Tsuyoshi

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   Vol. 12 ( 7 ) page: JAMDSM0129 - JAMDSM0129   2018

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    <p>ZnDTP antiwear additive for lubricating oil is known to absorb strongly on sliding surfaces in boundary lubricated tribosystems, forming a tribofilm, which is able to reduce the wear of involved surfaces. It is also known to increase the friction coefficient in most DLC/DLC contacts, with the exception of ta-C DLC / ta-C DLC contact, for which the difference in friction behaviors between a base oil + ZnDTP additive lubricated tribosystem and a base oil lubricated tribosystem is not very significant. In this study we investigate a characterization method of the shape of the tribofilm formed on different types of DLC coatings and on the relation between the shape of the tribofilm and the friction behavior of the related DLC coating. Results show that compared to other investigated DLC types, the tribofilm formed on ta-C DLC has some unique characteristic topography features that promote lower friction coefficient.</p>

    DOI: 10.1299/jamdsm.2018jamdsm0129

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  102. Comparative study on effects of load and sliding distance on amorphous hydrogenated carbon (a-C:H) coating and tetrahedral amorphous carbon (ta-C) coating under base-oil lubrication condition Reviewed

    Xiang Li, Xingrui Deng, Hiroyuki Kousaka, Noritsugu Umehara

    Wear   Vol. 392   page: 84 - 92   2017.12

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    In this study, the lubricated friction and wear associated with diamond-like coatings (DLCs) of amorphous hydrogenated carbon (a-C:H) and hydrogen-free tetrahedral amorphous carbon (ta-C) were comparatively analyzed. The effects of load and sliding distance on the wear and friction behaviors of the coatings were studied under a boundary-lubrication condition using a poly-alpha-olefin base oil. The DLC-coated cylindrical specimens were slid with their central axes perpendicular to the sliding direction against a rotating steel counterface. The results show that the friction coefficient of the ta-C coating was lower than that of the a-C:H coating, though a graphitized layer was detected both inside and outside the wear scar of the a-C:H coating. Under a relatively low applied load (5 N), the specific wear rate of the ta-C coating was considerably lower than that of the a-C:H coating. When the load was increased to a critical value of 10 N, the specific wear rate of the ta-C coating increased rapidly to 3–5 times that of the a-C:H coating. However, the specific wear rate of the a-C:H coating decreased significantly when the load exceeded 10 N, which was consistently maintained thereafter. With the increase in the sliding distance, the specific wear rate of the ta-C coating increased rapidly. In comparison to the ta-C coating, the specific wear rate of the a-C:H coating decreased only slightly with the increase in the sliding distance
    moreover, when the sliding distance exceeded 125 m, the specific wear rate of the a-C:H coating became much lower than that of the ta-C coating. The results of Raman spectroscopy, atomic force microscopy, and scanning electron microscopy show that the coatings were influenced by different types of wear mechanisms when slid under pure base-oil boundary-lubrication conditions.

    DOI: 10.1016/j.wear.2017.09.009

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  103. Effect of mating materials on wear properties of amorphous hydrogenated carbon (a-C:H) coating and tetrahedral amorphous carbon (ta-C) coating in base oil boundary lubrication condition Reviewed International journal

    Li Xiang, Sawaki Toshiya, Kousaka Hiroyuki, Murashima Motoyuki, Umehara Noritsugu

    JURNAL TRIBOLOGI   Vol. 15   page: 1-20   2017.12

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  104. Effect of oil temperature and counterpart material on the wear mechanism of ta-CNx coating under base oil lubrication Reviewed

    Xiaoxu Liu, Ryo Yamaguchi, Noritsugu Umehara, Motoyuki Murashima, Takayuki Tokoroyama

    WEAR   Vol. 390-391   page: 312 - 321   2017.11

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    Tetrahedral amorphous carbon nitride (ta-CNx), as an emerging and promising diamond-like carbon (DLC), has better mechanical properties than amorphous carbon nitride (a-CNx) to ensure the sufficient durability, and overcomes the limit of high internal stress of tetrahedral amorphous carbon (ta-C), which makes ta-CNx coatings of great worth of research for the tribological and mechanical applications. In this study, we present the effects of oil temperature and counterpart material on the wear behavior of ta-CNx coatings under base-oil lubrication, and further clarify the wear mechanism. ta-C and ta-CNx coatings with N/C atomic ratio of 2.2% and 11.0% were deposited by an ion beam assisted filtered arc deposition (IBA-FAD) system, and the tribological tests were performed using a ball-on-disk tribo-tester with ta-C and ta-CNx coated steel ball sliding against uncoated disk under base-oil lubrication. The results show that nitrogen doping tends to decrease the hardness and Young's modulus by reducing the sp(3) structure. Sliding against steel disk, with increase of sliding distance ta-CNx shows obviously distinct wear behavior compared to ta-C, much more slowly increasing wear volume, exhibiting excellent wear resistance. Increasing oil temperature from room temperature to 120 degrees C results in rising wear rates of all the three coatings, with totally worn out ta-C and much lower wear rate of ta-CNx, which decreases by more than half than ta-C for high nitrogen content ta-CNx. However, as the counterpart material changed from steel to alumina, the wear rate presents oppositely increasing tendency with N/C ratio, probably caused by the change of deciding factor to hardness in this mechanical wear. It is found that the wear performance of ta-CNx coating has a clear dependence on the oil temperature and counterpart material. Based on the results, the better wear resistance of softer ta-CNx against steel could be attributed to the less tribo-chemical wear between carbon and iron, due to the nitrogen doping partial passivation effect.

    DOI: 10.1016/j.wear.2017.08.012

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  105. Effect of carbon diffusion on friction and wear properties of diamond-like carbon in boundary base oil lubrication Reviewed International journal

    Kouami Auxence Melardot Aboua, Noritsugu Umehara, Hiroyuki Kousaka, Xingrui Deng, Haci Abdullah Tasdemir, Yutaka Mabuchi, Tsuyoshi Higuchi, Masahiro Kawaguchi

    Tribology International   Vol. 113   page: 389 - 398   2017.9

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    In order to control wear and friction in industry, Diamond like carbon (DLC) hard coatings are widely applied in recent years due to their well appreciated mechanical and tribological properties. However, those properties are not yet well understood, as well as behavior of DLC hard coatings when rubbed against other materials. Other researchers reported that DLC hard coatings film show high wear when rubbed against steel counterpart and their durability decrease with the increase of the temperature. In this research, we investigated on friction and wear properties of DLC coatings and the results reveal that carbon diffusion has a key role in the wear and friction behavior of DLC coatings when rubbed against steel.

    DOI: 10.1016/j.triboint.2016.10.047

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  106. Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy Reviewed

    Hidenori Nishimura, Noritsugu Umehara, Hiroyuki Kousaka, Motoyuki Murashima

    TRIBOLOGY INTERNATIONAL   Vol. 113   page: 383 - 388   2017.9

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    In order to clarify a low friction mechanism of CNx (Carbon Nitride) coating in PAO (Poly Alpha Olefin) oil lubrication, we measured reflectance spectrum at friction area in-situ by reflectance spectroscopy. And we obtained thicknesses and polarizabilities of oil film and transformed layer formed on bulk CNx coating during friction test by analyzing reflectance spectrum. From results, we concluded that the increments of polarizabilities of transformed layer and oil film had an effect on increasing thickness of oil film, and then the lubricated condition changed from boundary to mixed lubrication. Finally CNx coating showed low friction coefficient in PAO oil lubrication.

    DOI: 10.1016/j.triboint.2016.10.029

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  107. The effects of temperature, pressure and dissolved oxygen concentration (DO) in water on the wear of the hydrogenated diamond-like carbon (HDLC) at high temperature and pressurized water Reviewed

    Mohd Rody Bin Mohamad Zin, Yuji Yagi, Keiji Sasaki, Naruhiko Inayoshi, Takayuki Tokoroyama, Noritsugu Umehara, Hiroyuki Kousaka, Shingo Kawara

    Tribology International   Vol. 109   page: 48 - 57   2017.5

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    The aim of this study is to clarify the wear mechanism of hydrogenated diamond-like carbon (HDLC) coating in high temperature and pressurized water. A new reciprocating autoclave wear tester was developed to conduct the wear test between DLC coated pins against SUS316 plate in high temperature and pressurized water. The results showed that the wear of HDLC in water was greatly influenced by water temperature from 23 °C to 300 °C and dissolved oxygen concentration (DO) from 0.73 mg O/L to 47.5 mg O/L (mg O/L:milligrams oxygen per liter) in water. On the other hand, water pressure in the chamber did not have significant effect on the wear of HDLC when pressure was increased from 10 MPa to 30 MPa at 300 °C. Based on surface analysis by XPS, AFM nano scratch, Raman spectroscopy, and AES on the top most surface of the wear scar of HDLC, softening and oxidation of top layer of wear scar of HDLC was found to be the mechanisms of high wear of HDLC in high temperature and pressurized water. The transformation of sp3 to sp2 at higher water temperature is believed to be responsible for the reduced hardness of the top most surface of HDLC. Oxidation also provided softening of top layer of HDLC at higher DO in water.

    DOI: 10.1016/j.triboint.2016.12.010

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  108. Microscopic origin of ultra-low friction coefficient between the wear track formed on carbon nitride coating and transfer layer on sliding ball in friction tests under dry N-2

    Inoue Hiroshi, Muto Shunsuke, Arai Shigeo, Wasada Hiroaki, Umehara Noritsugu

    SURFACE & COATINGS TECHNOLOGY   Vol. 313   page: 31 - 39   2017.3

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    Carbon nitride (CNx) coatings have been found to exhibit an ultra-low friction coefficient (less than 0.01) after repeated sliding against a silicon nitride (Si3N4) ball in a dry nitrogen gas (N2) atmosphere. However, the mechanism for this has not yet been fully elucidated with respect to analyzing changes in the space structure of CNx. In the present study, we examined the microscopic structural changes in the near-surface structural transition layers of the wear track in the CNx coating and the transfer layer of the Si3N4 ball, using scanning transmission electron microscopy and electron energy-loss spectroscopy. We investigated the nitrogen concentration, density, and curvature of fragmented graphitic planes in the structural transition layers of both the CNx coating and the transfer layer of the Si3N4 ball by analyzing the plasmon peak and carbon K-edge. In addition, we theoretically examined the chemical bonding states of nitrogen doping in various model clusters using an ab initio molecular orbital method to clarify the role of nitrogen in the ultra-low friction behavior. The mechanism behind the ultra-low friction behavior is explained by nano-graphitization of the fragmented carbon structure with optimal nitrogen concentration passivating the contacting counter surfaces of the coating and ball formed during sliding.

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  109. Effect of Electric Field on Adhesion of Thermoplastic Resin against Steel Plate, Reviewed

    M. Murashima, N. Umehara, H. Kousaka, X. Deng

    Tribology Online   Vol. 12 ( 2 ) page: 42-48   2017.2

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  110. Microscopic origin of ultra-low friction coefficient between the wear track formed on carbon nitride coating and transfer layer on sliding ball in friction tests under dry N2. Reviewed International journal

    H. Inoue, S. Muto, S. Arai, H. Wasada, N. Umehara

    Surface Coatings & Technology   Vol. 313   page: 31-39   2017.2

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  111. Effects of Ceramic Counterpart Material on Wear Property of a-C:H Coating under Reviewed

    T. Yamanouchi, X. Deng, Y. Tanaka, N. Umehara, H. Kousaka

    Tribologist   Vol. 62 ( 1 ) page: 52-58   2017.1

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  112. Clarification of effect of transformed layer and oil film on low friction coefficient of CNx coating in PAO oil lubrication by in-situ observation of friction area with reflectance spectroscopy Reviewed

    H. Nishimura, N. Umehara, H. Kousaka, M. Murashima

    Tribology International   Vol. 113   page: 383-388   2017.1

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  113. Depth Profile of Oxygen of Diamond-Like Carbon Sliding Under Pressurized Hot Water Reviewed

    M. R. B. Mohamad Zin, K. Okuno, N. Umehara, N. Inayoshi, K. Sasaki, S. Kawara,H. Kousaka

    Tribology Online   Vol. 12 ( 1 ) page: 8-17   2017.1

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  114. Tribological properties of ta-CNx coatings with different nitrogen content under oil lubrication conditions Reviewed

    Deng Xingrui, Hattori Takafumi, Umehara Noritsugu, Kousaka Hiroyuki, Manabe Kazuyoshi, Hayashi Keiji

    THIN SOLID FILMS   Vol. 621   page: 12 - 18   2017.1

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    Carbon nitride (CNx) coatings exhibit a wide range of attractive properties that make them suitable for demanding mechanical and tribological applications. In this study, an ion beam assisted filtered arc deposition (IBA-FAD) method has been developed for the deposition of tetrahedral amorphous carbon nitride (ta-CNx) coatings. The ta-CNx coatings with various nitrogen contents were deposited by controlling the nitrogen flow to investigate the effects of nitrogen content on their tribological behavior. The composition and structure of the ta-CNx coatings were evaluated using X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The tribological properties were examined using a ball-on-disk tribo-tester under oil lubrication condition. The results showed that nitrogen contents of ta-CNx coatings were restricted to the range of 0–11 at.% by nitrogen ion density. The hardness decreased with an increase in the nitrogen content as nitrogen decreased the fraction of sp3 carbon in the coatings. The ta-CNx coatings exhibit low friction under oil lubrication and the maximum value was obtained for samples containing 8 at.% of nitrogen. ta-CNx with 8–11 at.% of nitrogen exhibited markedly low wear rate.

    DOI: 10.1016/j.tsf.2016.11.025

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  115. Tribological properties of ta-CNx coatings with different nitrogen content under oil lubrication conditions Reviewed International journal

    X. Deng, T. Hattori, N. Umehara, H. Kousaka, K. Manabe, K. Hayashi

    Thin Solid Films   Vol. 616   page: 134-140   2017.1

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  116. Clarification of high wear resistance mechanism of ta-CNx coating under poly alpha-olefin (PAO) lubrication Reviewed

    Xiaoxu Liu, Ryo Yamaguchi, Noritsugu Umehara, Xingrui Deng, Hiroyuki Kousaka, Motoyuki Murashima

    TRIBOLOGY INTERNATIONAL   Vol. 105   page: 193 - 200   2017.1

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    Tetrahedral amorphous carbon nitride (ta-CNx) is suitable for tribological application due to its excellent mechanical and adhesion properties. In this study, ta-CNx coatings with N/C ratios (0-11%) are deposited by ion beam assisted filtered arc deposition (IBA-FAD), and the tribological properties are investigated with a ball on-disk tribo-tester. The results show that nitrogen doping decreases the fraction of sp(3) bonding, hardness, Young's modulus and roughness. In oil ta-CNx presents slightly decreasing friction coefficient and improving wear resistance with the N/C ratio, indicating softer ta-CNx with better wear resistance. The lower surface roughness after friction of high nitrogen content ta-CNx makes it more likely to transit to mixed lubrication, resulting in lower contact load that can explain the better wear resistance.

    DOI: 10.1016/j.triboint.2016.10.016

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  117. Future of Tribology and Technology Education with Tribology

    UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 62 ( 10 ) page: 609 - 609   2017

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    DOI: 10.18914/tribologist.62.10_609

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  118. Fabrication of Thin Solid Coating and Tribology with Plasma and Ion Beam Process

    KOUSAKA Hiroyuki, UMEHARA Noritsugu

    Journal of the Japan Society for Precision Engineering   Vol. 83 ( 4 ) page: 319 - 324   2017

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    DOI: 10.2493/jjspe.83.319

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  119. Effect of drill surface texturing on back burr height with solid lubricating sheet in titanium alloy drilling Reviewed

    OYAMA Shintaro, UMEHARA Noritsugu, KOUSAKA Hiroyuki, DENG Xingrui, MURASHIMA Motoyuki, HORIE Shigeru, MATSUYAMA Yousuke

    Transactions of the JSME (in Japanese)   Vol. 83 ( 849 ) page: 16-00378 - 16-00378   2017

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    <p>This paper describes about the effect of drill surface texturing on height of back burr in titanium alloy drilling process with solid lubricating sheet. Titanium alloy is difficult to conduct drilling because titanium alloy is hard and ductile material. And the workers cannot use plenty of liquid coolant for preventing the productivity decline when the work places are above their heads in production fields. Therefore drills are exchanged frequently even though the cost increases. In this study, we measured the cutting force by a loadcell to know the effect of drill surface texturing and solid lubricating sheet on drilling process of work pieces made of Ti-6Al-4V. As the results, drill with rough textured rake surface showed high burr height in exit of Ti-6Al-4V. On the other hand, drill with rough textured flank surface showed low burr height only if drilling with solid lubricating sheet. Moreover, drill with the specific texturing on flank surface by wire electric discharge machining showed low burr height.</p>

    DOI: 10.1299/transjsme.16-00378

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  120. Analysis of Wear Track on DLC Coatings after Sliding with MoDTC-Containing Lubricants Reviewed International journal

    Ohara Kenji, Hanyuda Kiyoshi, Kawamura Yasushi, Omura Kentaro, Kameda Imari, Umehara Noritsugu, Kousaka Hiroyuki

    TRIBOLOGY ONLINE   Vol. 12 ( 3 ) page: 110-116 - 116   2017

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    DOI: 10.2474/trol.12.110

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  121. Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC Reviewed International journal

    Komori Kentaro, Umehara Noritsugu

    Tribology Online   Vol. 12 ( 3 ) page: 123 - 134   2017

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    In this study, we investigated tribological properties of “tetrahedral” Si-containing hydrogenated DLC coating (TMS coating) during sliding against steel or cast-iron lubricated with engine-oil containing MoDTC and ZnDTP additives. TMS coatings derived from only tetramethylsilane were prepared using PACVD with high-bias process. TMS coating had the highly carbon sp<sup>3</sup> bonded structure induced by Si (over 20 at.%) with high hydrogen content (30 at.%). TOF-SIMS analysis showed that TMS coating could form the additive-derived tribofilm on both of the non-ferrous coating surface and the ferrous counter surface to promote Mo-sulfide formation effectively, leading a low friction coefficient. The tribo-chemical reactions were related not only to Mo-sulfides formation, but also reduction of Mo-oxides. Mo-oxides could react with DLC material and induce hydrogen evolution and transformation into further weak carbon structure, causing an increasing wear of hydrogenated DLCs. TMS coating showed no significant wear in spite of plenty hydrogen content. Si induced sp<sup>3</sup> bond and could act so as not to induce clustering of the sp<sup>2</sup> phase. This could inhibit increasing wear of the DLC in the presence of MoDTC. The effectiveness of TMS coating in friction and wear behavior was shown to depend on tribo-chemical reactions and transformation of carbon bond structure.

    DOI: 10.2474/trol.12.123

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  122. Proposal of lightweight and low starting torque slide bearing with looped carbon fibers brush Reviewed

    SHITAKA Takuya, MURASHIMA Motoyuki, UMEHARA Noritsugu, TSUKIYAMA Yosuke, NITTA Isami, KOUSAKA Hiroyuki, DENG Xingrui

    Transactions of the JSME (in Japanese)   Vol. 83 ( 854 ) page: 17-00252 - 17-00252   2017

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    <p>This paper addresses a novel lightweight and low starting torque bearing with looped carbon fiber brush (LCFB). LCFB simulates bristle of living being. Moreover, the static friction coefficient is nearly equal to the kinetic friction coefficient. By applying LCFB to a slide bearings, where a shaft is supported by multiple LCFBs, it is realized low starting torque bearings as well as lightness compared to conventional ball bearings. In this paper, we manufacture prototype LCFB slide bearings. With the bearings, we compare friction torque between LCFB slide bearings, slide bearings and deep groove ball bearings. As results, the ratio of starting torque to regular torque of LCFB slide bearing is from 0.93 to 1.07 which is smaller than that of the slide bearing. When micro-spline shaft is used as a mating material of LCFB slide bearing, the torque reduces because of decrease of real contact area between LCFB and mating materials. In addition, since LCFB utilize elastic deformation of fibers, LCFB slide bearings are not endurable in heavy radial load as high as load rating of ball bearing. Therefore, we define the load capacity of LCFB slide bearing from buckling load of a carbon fiber bundle to avoid overload state. We propose the load capacity as a design guideline of LCFB slide bearings.</p>

    DOI: 10.1299/transjsme.17-00252

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  123. Depth Profile of Oxygen of Diamond-Like Carbon Sliding under Pressurized Hot Water Reviewed International coauthorship International journal

    Bin Mohamad Zin Mohd Rody, Okuno Kiichi, Sasaki Keiji, Inayoshi Naruhiko, Umehara Noritsugu, Kousaka Hiroyuki, Kawara Shingo

    Tribology Online   Vol. 12 ( 1 ) page: 8 - 17   2017

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    The wear mechanism of diamond-like carbon (DLC) in hot, pressurized water has been studied by the oxygen depth profile of DLC films pre and post a sliding test. The sliding test between DLC films coated on chromium molybdenum steel (JIS SCM420) pins and austenitic stainless steel (JIS SUS316) plates was conducted in a water environment by using high temperatures of 100, 200, 250 and 300°C and a high-pressured (10 MPa) autoclave friction tester. The dissolved oxygen concentration (<i>DO</i>) was 0.52 mg/L for oxygen-poor water and 40 mg/L for oxygen-rich water. The experimental results showed that the specific wear rate of DLC was strongly related to the water temperature and the <i>DO</i> concentration. The specific wear rate in both cases of oxygen-poor and oxygen-rich water showed a temperature dependency. When the temperature was below 200°C, the specific wear rate of DLC did not depend on the <i>DO</i> concentration. On the other hand, when the water temperature was more than 200°C, the specific wear rate drastically increased with the <i>DO</i> concentration. In order to prove the effect of oxidation on the wear rate of DLC, the depth profile of the oxygen concentration was compared to that of the carbon concentration on the inside and outside of the wear scar of DLC after sliding tests in hot, pressurized water. When the concentration of <i>DO</i> in the water was low at 0.52 mg/L, the O/C ratio was not affected by the water temperature. On the other hand, when the concentration of <i>DO</i> in water was high at 40 mg/L, the O/C ratio of the top surface increased from 0.05 to 0.18 with an increase in the water temperature on the inside of the wear scar of DLC, where the O/C ratio on the inside of the wear scar was higher than that on the outside of the scar. On the basis of the estimated rate of reaction between DLC and oxygen, determined from a linear relationship between ln (Oxidation wear volume) and the inverse temperature, it was concluded that the oxidation of DLC governed the wear of DLC in hot, pressurized water. Friction was found to enhance the oxidation wear of DLC from the estimated activation energy.

    DOI: 10.2474/trol.12.8

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  124. Effect of Electric Field on Adhesion of Thermoplastic Resin against Steel Plate Reviewed International journal

    Murashima Motoyuki, Umehara Noritsugu, Kousaka Hiroyuki, Deng Xingrui

    Tribology Online   Vol. 12 ( 2 ) page: 42 - 48   2017

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    This work shows new method which controls adhesion strength between acrylic resin and metal mold with electric field. Usage of electric field is considered as a new solution to control adhesion of thermoplastic resin in Carbon-Fiber-Reinforced ThermoPlastic (thermoplastic CFRP) stamping process because this method can prevent CFRP from its degradation. In this work, we establish new adhesion tester which can apply Direct Current (DC) or Alternating Current (AC) field on metal specimens. In the results, when DC −12 V/mm is imposed on metal specimens, adhesion strength increases to 0.81 MPa which is 57% higher than that of no field condition. Negative component of surface energy after imposing DC −12 V/mm on metal specimens is 7.6 mJ/m<sup>2</sup>. This value is 56% smaller than that of no field condition. When AC electric fields is imposed, adhesion strength decreases from no electric field condition. The most effective AC field condition is AC 10 V/mm with 1 MHz, in which case adhesion strength is 0.29 MPa. This value is 44% lower than that of no field condition.

    DOI: 10.2474/trol.12.42

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  125. <i>In-Situ</i> Observation Apparatus for Structure Change of Topmost Layer of Cabonaceous Hard Coatings during Sliding with Refrectance Spectroscopty

    NISHIMURA Hidenori, KOUSAKA Hiroyuki, UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 62 ( 7 ) page: 461 - 464   2017

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    DOI: 10.18914/tribologist.62.07_461

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  126. Development of radio knife tip to prevent adhesion of coagulated blood by separate type thermosyphon Reviewed

    TOKOROYAMA Takayuki, OSUKA Misato, UMEHARA Noritsugu

    Transactions of the JSME (in Japanese)   Vol. 83 ( 845 ) page: 16-00123 - 16-00123   2017

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    <p>Radio knives are common tools in surgery. The adhesion of the tip of a radio knife to the human body through the coagulation of blood is a severe problem. A solution to this problem, suggested by other authors, is to cool the tip of the radio knife. However, introducing a cooling system, such as circulating water inside the tip with a pump, requires additional wires and pipes and may also distract the surgeons. To overcome these issues, we consider the possibility of embedding a separate type thermosyphon to cool the radio knife tip without any additional wires and pipes. The important parameters are the tip length, tip diameter, inner tip diameter, enclosure ratio of the working fluid, and grip length. First, to clarify the heat-transport possibilities, the top of the tip of a separate type thermosyphon radio knife was heated by a ceramic heater; this was done to measure the temperature difference between the radio knife tip surface and a heat release part. Second, suitable values for the tip length, diameter and other important parameters were considered. It was concluded that the highest cooling efficiency is obtained when the heating area is limited between 200 and 250 mm<sup>2</sup> of the knife tip surface area. The inner pipe was indispensable to transport generated heat from the tip to the radio knife end. Consequently, it was revealed that the effective diameter of inner pipe was 0.48 mm in this research. To simulate the conventional surgery situations, the radio knife tip was immersed to blood and applied voltage to generate heat at the tip. It demonstrated 45.9 degree C at the maximum temperature while it was activated. Furthermore, the coagulation at the peripheral of the tip was observed, accordingly, the separate type thermosyphon radio knife exhibited a stop bleeding ability.</p>

    DOI: 10.1299/transjsme.16-00123

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  127. Effects of ceramic counterpart material on wear property of a-C:H coating under various temperatures Reviewed

    Yamanouchi T., Xingrui D., Tanaka Y., Umehara N., Kousaka H.

    Toraibarojisuto/Journal of Japanese Society of Tribologists   Vol. 62 ( 1 ) page: 52 - 58   2017

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    Carbon coatings have a keen attention according to its low friction, high hardness and high wear resistance properties. There are needs to apply carbon coatings into ceramic mechanical parts, such as mechanical seal. However the tribological properties of carbon coatings when slid against ceramics are still not investigated sufficiently. Generally tribological behaviors are affected by a counterpart material. Therefore more fundamental researches about counterpart material are necessary. In this research tribological behaviors of carbon coating when slid against various counterpart material, including SiC, SiC(O) that is SiC after annealing at 1000°C, Si3N4, Al2O3, Al2O3(Si) that includes more Si atomic concentration than Al2O3and Si wafer at various temperatures in air have been investigated. Carbon coating when slid against SiC showed the lowest wear rate at 23°C, and carbon coating when slid against Si3N4showed the lowest wear rate at 140°C and carbon coating when slid against SiC(O) showed the lowest friction coefficient at all temperature.

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  128. Effect of Carbon Diffusion on Friction and Wear Properties of Diamond-Like Carbon in Boundary Oil Lubrication Reviewed

    K. A. M. ABOUA, N. UMEHARA, H. KOUSAKA, X. Deng, H. A. TASDEMIR, Y. MABUCHI, T. HIGUCHI, M. KAWAGUCHI

    Tribology International   Vol. 103   page: 388-393   2016.12

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  129. The cutting behaviour observation of the artificial hair by oscillation and rotation shaver Reviewed

    T. TOKOROYAMA, N. NAKANISHI and N. UMEHARA

    Trans. of the JSME   Vol. 82 ( 844 )   2016.11

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    DOI: 10.1299/transjsme.16-00187

  130. Tribological Properties of High Hardness ta-CNx Coatings Deposited by Filtered Arc Deposition with Block-on-Ring Tribotester

    T. Hattori, N. Umehara, H. Kousaka, X. Deng, K. Manabe, K. Hayashi

    Procedia Manufacturing   Vol. 5   page: 1224-1233   2016.11

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  131. Structure analysis of topmost layer of CNx after repeated sliding using scanning transmission electron microscopy electron energy-loss spectroscopy Reviewed

    H. Inoue, S. Muto, X. Deng, S. Arai, N. Umehara

    Thin Solid Films   Vol. 616   page: 134-140   2016.10

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  132. Mechanical and electrical properties of micron-thick nitrogendoped tetrahedral amorphous carbon coatings Reviewed

    Y.-J. Jang, Y.-J. Kang, K. Kitazume, N. Umehara, J.-K. Kim

    Diamond and Related Materials     2016.8

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    DOI: 10.1016/j.diamond

  133. Ultra-low friction properties of carbon nitride tantalum coatings in the atmosphere Reviewed

    T.Tokoroyama, T. Hattori, N. Umehara, H. Kousaka, K. Manabe, M. Kishi, Y. Fuwa

    Tribology International   Vol. 103   page: 388-393   2016.5

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  134. Effect of Nano-Texturing on Adhesion of Thermoplastic Resin against Textured Steel Plate Reviewed

    M. Murashima, N. Umehara, H. Kousaka

    Tribology Online   Vol. 11 ( 3 ) page: 159-167   2016.4

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  135. The Clarification of Low Friction Mechanism for Hydrogenated Amorphous Carbon by In-situ Observation of Frictional Area Reviewed

    H. Nishimura, N. Umehara, H. Kousaka, X. Deng

    Tribology Online   Vol. 11 ( 2 ) page: 341-347   2016.2

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  136. Clarification of relationship between friction coefficient and transformed layer of CNx coating by in-situ spectroscopic analysis Reviewed

    H. Nishimura, N. Umehara, H. Kousaka, T. Tokoroyama

    Tribology International   Vol. 93   page: 102-112   2016.1

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  137. Suggestion of the development guideline of lubricating sheet in drilling titanium alloy for aircraft Reviewed

    Takayuki KAWASAKI, Noritsugu UMEHARA, Hiroyuki KOUSAKA, Takayuki TOKOROYAMA, Shigeru HORIE, Yousuke MATSUYAMA

      Vol. 81 ( 831 ) page: 15-00247   2015.11

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  138. Effect of metal surface temperature on adhesion between thermoplastic resin and metal surface Reviewed

    Motoyuki MURASHIMA, Noritsugu UMEHARA, Hiroyuki KOUSAKA and Takayuki TOKOROYAMA

      Vol. 81 ( 822 ) page: 14-00098   2015.2

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  139. Effect of surface morphology of diamond-likecarbon coating on friction, wear behavior and tribo-chemical reactions under engine-oil lubricated condition Reviewed

    Kentaro Komori and Noritsugu Umehara

    Tribology International   Vol. 84   page: 100-109   2015.2

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  140. The effect of oil temperature and additive concentration on the wear of non-hydrogenated DLC coating Reviewed

    H. Abdullah Tasdemir, Masaharu Wakayama, TakayukiTokoroyama, Hiroyuki Kousaka , Noritsugu Umehara, Yutaka Mabuchi, Tsuyoshi Higuchi

    TribologyInternational   Vol. 77   page: 65-71   2014.12

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  141. Deposition and tribological behaviors of ternary BCN coatings at elevated temperatures Reviewed

    Xingrui Deng, Hiroyuki Kousaka, Takayuki Tokoroyama, Noritsugu Umehara

    Surface Coatings & Technology   Vol. 259   page: 2-6   2014.11

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  142. Oil-lubricated friction characteristic of Si-containing hydrogenated carbon nitride films deposited by PECVD Reviewed

    Kazutaka KITAZUME, Hiroyuki KOUSAKA, Takayuki TOKOROYAMA, Noritsugu UMEHARA, Yoshio FUWA and Kazuyoshi MANABE

      Vol. 80 ( 820 ) page: 14-00346   2014.10

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  143. Effect of hydrophilized PTFE brush structure on seizure resistance in water Reviewed

    Shingo KAWARA, Noritsugu UMEHARA, Takayuki TOKOROYAMA, Masahiro SUZUKI,Toshiyuki SAITO and Hirokazu ARAI

      Vol. 80 ( 816 ) page: 14-00048   2014.8

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  144. 潤滑油中におけるDLC 膜同士の摩擦により発生した摩耗粒子の分析手法 Reviewed

    大原 健司,野老山 貴行,上坂 裕之,梅原 徳次

    トライボロジスト   Vol. 59 ( 7 ) page: 429-436   2014.7

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  145. Proposals of high frictional and low aggressive abrasion(The effect of abrasive shape and disc material for degree of wear) Reviewed

    Miho SUMIGAMA, Noritsugu UMEHARA, Takayuki TOKOROYAMA and Hiroyuki KOUSAKA

      Vol. 80 ( 815 ) page: SMM0182   2014.7

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    DOI: 10.1299/transjsme.2014smm0182

  146. Influence of zinc dialkyldithiophosphate tribofilm formation on thetribologicalperformance of self-mated diamond-like carbon contacts under boundary lubrication Reviewed

    H. Abdullah Tasdemir, Takayuki Tokoroyama, Hiroyuki Kousaka, Noritsugu Umehara, Yutaka Mabuchi

    Thin Solid Films   Vol. 562   page: 389-397   2014.6

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    DOI: 20140601

  147. Effect of tetramethylsilane flow on the deposition and tribological behaviors of silicon doped Diamond-like carbon rubbed against polyoxymethylene Reviewed

    Xingrui Deng, Yankuang Lim, Hiroyuki Kousaka, Takayuki Tokoroyama and Noritsugu Umehara

    Jpn. J. Appl. Phys.   Vol. 52   page: 11NA01   2014.5

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  148. Proposals of high frictional and low aggressive abrasion Reviewed

    Miho SUMIGAMA, Noritsugu UMEHARA, Takayuki TOKOROYAMA and Hiroyuki KOUSAKA

      Vol. 80 ( 811 ) page: SMM0038   2014.3

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    DOI: 10.1299/transjsme.2014smm0038

  149. Tribological behaviors of tetrahedral amorphous carbon (ta-C) coatings at elevated temperature Reviewed

    Xingrui Deng, Hiroyuki Kousaka, Takayuki Tokoroyama, Noritsugu Umehara

    Tribology International   Vol. 75   page: 98-103   2014.2

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  150. Study on effects of Ph12SQ on the thermal stability and mechanical properties of high temperature vulcanized (HTV) silicone rubber Reviewed

    Mitra Khiabani Moghadam, Jalil Morshedian, Morteza Ehsani, Richard Laine, Lim Yan Kuang, Noritsugu Umehara

    IEEE Transactions on Dielectrics and Electrical Insulation   Vol. 21 ( 1 ) page: 244-252   2014.1

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  151. Influence of carbon black in engine oil on wea rof H-free diamond-like carbon coatings Reviewed

    Y.Mabuchi, T.Higuchi, D.Yoshimura, M.Murashima, H.Kousaka, N.Umehara

    Tribology International   Vol. 73   page: 138-147   2014.1

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  152. Axial uniformity of diamond-like carbon film deposited on metal rod by using microwave sheath voltage combination plasma Reviewed

    Xingrui Deng, Yasuyuki Takaoka, Hiroyuki Kousaka, Noritsugu Umehara

    Surface and Coatings Technology   Vol. 238 ( 15 ) page: 80-86   2014.1

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  153. Effect of Plasma-On Time on the Axial Distribution of Film Thickness in Internal Diamond-Like Carbon Coating with Microwave-Excited High-Density Plasma Reviewed

    Ryosuke Matsui, Hiroyuki Kousaka, and Noritsugu Umehara

    Jpn. J. Appl. Phys.   Vol. 52   2013.12

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    DOI: 11NA01

  154. Wear behavior of tetrahedral amorphous diamond-like carbon (ta-C DLC) in additive containing lubricants Reviewed

    H. Abdullah Tasdemir, Masaharu Wakayama, Takayuki Tokoroyama,Hiroyuki Kousaka, Noritsugu Umehara, Yutaka Mabuchi, Tsuyoshi Higuchi

    Wear   Vol. 307   page: 1-9   2013.11

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  155. Effect of Texturing on Friction Properties of CNx Coating Layer under Oil Lubrication with Imitation Wear Debris Reviewed

    Takayuki TOKOROYAMA, Tomoyo KANEKO, Yosuke TSUKIYAMA, Noritsugu UMEHARA,Tetsuya SATO and Tadashi SUZUKI

      Vol. 79 ( 806 ) page: 3895-3903   2013.10

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  156. Hardness effect of DLC on tribological properties for sliding bearing under boundary lubrication condition in additive-free mineral base oil Reviewed

    Nor Azmmi Bin Masripan, Kenji Ohara, Noritsugu Umehara, Hiroyuki Kousaka, Takayuki Tokoroyama, Shigeru Inami, Koji Zushi, Masahito Fujita

    Tribology International   Vol. 65   page: 2265-2269   2013.10

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  157. Ultra-low friction of tetrahedral amorphous diamond-like carbon (ta-C DLC) under boundary lubrication in poly alpha-olefin (PAO) with additives Reviewed

    H. Abdullah Tasdemir, Masaharu Wakayama, Takayuki Tokoroyama,Hiroyuki Kousaka, Noritsugu Umehara, Yutaka Mabuchi, Tsuyoshi Higuchi

    Tribology International   Vol. 65   page: 286-294   2013.10

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  158. Evaluation of the transformed layer of DLC coatings after sliding in oil using spectroscopic reflectometry Reviewed

    Kenji Ohara, Nor Azmmi Bin Masripan, Noritsugu Umehara, Hiroyuki Kousaka , Takayuki Tokoroyama, Shigeru Inami, Koji Zushi, Masahito Fujita

    Tribology International   Vol. 65   page: 2265-2269   2013.10

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  159. Wear analysis of hydrogen-free diamond-like carbon coatings under a lubricated condition Reviewed

    Y. Mabuchi, T.Higuchi, Y.Inagaki, H.Kousaka, N.Umehara

    Wear   Vol. 298-299   page: 48-56.   2013.9

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  160. Internal DLC coating of narrow metal tubes using high-density near plasma sustained by microwaves propagating along plasma-sheath interfaces Reviewed

    H. Kousaka, K. Mori, N. Umehara, N. Tamura, and T. Shindo

      Vol. 229 ( 25 ) page: 65-70   2013.8

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  161. Clarification of peeling off mechanism of DLC film during heating/cooling process Reviewed

    D. Sannomiya, H. Kousaka, T. Tokoroyama, N. Umehara

      Vol. 79 ( 799 ) page: 858-865   2013.7

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  162. Optimization of Photochemical Fluorinated Gasket for Medical Syringe without Silicone Oil Reviewed

    Tougo OGURA. Keisuke USAMI, Hiroyuki KOUSAKA, Noritsugu UMEHARA and Takayuki TOKOROYAMA

      Vol. 79 ( 803 ) page: 2506-2516   2013.7

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  163. Clarification of Hysteresis Mechanism in the Indentation of the High-Densed Carbon Nanotube Film Reviewed

    Masaharu WAKAYAMA, Yosuke TSUKIYAMA, Takayuki TOKOROYAMA, Hiroyuki KOUSAKA and Noritsugu UMEHARA

      Vol. 79 ( 801 ) page: 日本機械学会論文集(C編)   2013.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  164. Effect of the plasma irradiation on the friction of carbon fiber Reviewed

    Daiki SANNOMIYA, Noritsugu UMEHARA, Takayuki TOKOROYAMA and Hiroyuki KOUSAKA

      Vol. 79 ( 801 ) page: 1827-1836   2013.5

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  165. Wear analysis of hydrogen-free diamond-like carbon coatings under a lubricated condition Reviewed

    Y. Mabuchi, T.Higuchi, Y.Inagaki, H.Kousaka, N.Umehara

      Vol. 298-299   page: 48-56   2013.2

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  166. 炭化ケイ素基板研磨のための電界砥粒分布制御研磨法に関する研究 –電界による研磨率向上メカニズムの検討- Reviewed

    久住孝幸,佐藤安弘,池田 洋,赤上陽一,梅原徳次

    精密工学会誌   Vol. 79 ( 1 ) page: 87-92   2013.1

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  167. Surface Modification of Surface Wave-Excited Plasma Treated Chloride-Isobutene Rubber for Adhesion Reduction Reviewed

    J-H. Kim, H. Kousaka, N. Umehara, M. Shimada, and M. Hasegawa

    Journal of Materials and Manufacturing Processes   Vol. 27 ( 11 ) page: 1257-1261   2012.12

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  168. Observation of Source Gas Depletion in Narrow Metal Tube During Internal Diamond-Like Carbon Coating with Microwaves Reviewed

    R. Matsui, K. Mori, H. Kousaka, and N. Umehara

    Diamond and Related Materials   Vol. 31   page: 72-82   2012.6

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  169. Investigation of Affecting factors on the Hardness of Fluorine-Containing Amorphous Carbon Film Coated by Pulsed-Plasma Ablation Reviewed

    Shingo Kawara, Eri Hamajima, Hiroyuki Koizumi, Hiroyuki Kousaka, Kazuhiko Yamada, Noritsugu Umehara and Yoshihiko Arakawa

      Vol. 40 ( 7 ) page: 1820-1828   2012.6

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  170. Tribological Characteristics on the Helical Gear in Cold Forging Mold Reviewed

    Won Sik Choi, Jea Hwan Son, Inh Lee, Eun Young Jin, Ju Ri Kwon, Young Moon Lee, Noritsugu Umehara

    Materials Science Forum Vols. 704-705 (2012) pp 277-283   Vol. 704-705   page: 277-283   2012.5

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  171. Influence of UV irradiation in low frictional performance of CNx coatings Reviewed

    LUBRICATION SCIENCE, Vol.24, No.3, (2012-4), pp.129-139.   Vol. 24 ( 3 ) page: 129-139   2012.4

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  172. Deformation and wear map of DLC coating under cyclic impacts Reviewed

    Mohd Fadzli Bin Abdollah, Yuto Yamaguchi, Tsuyoshi Akao, Naruhiko Inayoshi, Nobuyuki MIYAMOTO, Takayuki Tokoroyama,Noritsugu Umehara

    Wear,Vol.274-275,No.27, (2012-2), pp.435-441.   Vol. 274-275 ( 27 ) page: 435-441   2012.2

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  173. 加振式及び冷却式血液凝固付着抑制電気メスの開発 Reviewed

    中島悠也,野老山貴行,梅原徳次,赤上陽一

    日本機械学会論文集(C編),78, 786(2012-2),pp.605-614.   Vol. 78 ( 786 ) page: 605-614   2012.2

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  174. イオンビームミキシング法によるCNx膜の摩擦特性と密着性に及ぼす中間層の影響 Reviewed

    若山幹晴,月山陽介,野老山貴行,梅原徳次,Wang Mei,戸井原正臣

    日本機械学会論文集(C編),77, 781(2011-9),pp.3502-3510.   Vol. 77 ( 781 ) page: 3502-3510   2011.9

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  175. 材料充填した微小溝の付与による電気メスチップの焦げ付き抑制 Reviewed

    中島悠也,野老山貴行,梅原徳次,赤上陽一

    日本機械学会論文集(C編),77, 779(2011-7),pp.2916-2921.   Vol. 77 ( 779 ) page: 2916-2921   2011.7

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  176. CNx膜の摩擦面その場観察手法を用いたトライボマイクロプラズマの観察と移着膜形成が摩擦係数に及ぼす影響 Reviewed

    宮平裕生,野老山貴行,梅原徳次,不破良雄

    トライボロジスト,56,6(2011-6)pp.378-384.   Vol. 56 ( 6 ) page: 378-384   2011.6

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  177. The Effect of Maximum Normal Impact Load, Absorbed Energy, and Contact Impulse, on the Impact Crater Volume/Depth of DLC Coating Reviewed

    Mohd Fadzli Bin Abdollah, Yuto Yamaguchi, Tsuyoshi Akao, Naruhiko Inayoshi, Takayuki Tokoroyama, Noritsugu Umehara

    Tribology Online, Vol.6, 6(2011), pp.257-264.   Vol. 6 ( 6 ) page: 257-264   2011.6

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  178. ダイヤモンドライクカーボン膜の潤滑中摩擦係数に及ぼす紫外線照射の影響 Reviewed

    野老山貴行,羽田野拓也,梅原徳次,不破良雄

    トライボロジスト,56,4(2011-4)pp.256-263.   Vol. 56 ( 4 ) page: 256-263   2011.4

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  179. CNx膜の硬さに及ぼす成膜時基板温度・窒素イオンビーム加速電圧・成膜速度の影響 Reviewed

    野老山貴行,齋藤諒介,梅原徳次,不破良雄

    日本機械学会論文集(C編),77, 775(2011-3),pp.624-631.   Vol. 77 ( 775 ) page: 624-631   2011.3

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  180. 窒素中で超低摩擦を発現する極表面層の機械的特性の評価 Reviewed

    木村徳博,月山陽介,野老山貴行,梅原徳次

    日本機械学会論文集(C編),76, 772(2010-12),3794-3799.   Vol. 76 ( 772 ) page: 3794-3799   2010.12

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  181. ダイヤモンドライクカーボン膜の大気中摩擦係数に及ぼす紫外線照射の影響 Reviewed

    野老山貴行,羽田野拓也,梅原徳次,不破良雄

    日本機械学会論文集(C編),76, 771(2010-11),3166-3171.   Vol. 76 ( 771 ) page: 3166-3171   2010.11

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  182. Phase transformation studies on the a-C coating under repetitive impacts Reviewed

    Mohd Fadzli Bin Abdollah, Yuto Yamaguchi, Tsuyoshi Akao, Naruhiko Inayoshi, Noritsugu Umehara,Takayuki Tokoroyama

    Surface & Coatings Technology   Vol. 205   page: 625-631   2010.10

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  183. The Effect of Ultraviolet Ray Irradiation on Tribology Property of Carbon Nitride Coating Reviewed

    Trans. of the JAST, Vol.55, No. 9, (2010), pp.659-665   Vol. 55 ( 9 ) page: 659-665   2010.9

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  184. Improvement of ashering strength of DNA for polycarbonate substrate including Titaniumu Oxide with ion beam irradiation Reviewed

    Yasuhito DEMIZU, Noritsugu UMEHARA, Mikio MURAOKA, Jun IMAI, Yoichi AKAGAMI, and Shingo KANDA

    Trans. of the JSME, C   Vol. 76 ( 768 )   2010.8

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  185. Micro Texturing of Polycarbonate Plate with Ion Beam Irradiation and its Friction Properties in Water Reviewed

    Noritsugu Umehara, Yasuhito Demizu, Junichi Nishio and Takayuki Tokoroyama

    Key Engineering Materials   Vol. 447-448   page: 576-678   2010.8

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  186. Effect of Oxide on Friction of Rail-steel Roller/Plate Contact Reviewed

    Takamitsu TANAGAKI, Noritsugu UMEHARA, Kazuhiro TOYAMA, Makoto ISHIDA,Ying JIN and Shoji KAMIYA

    Trans. of the JSME, C   Vol. 76 ( 764 ) page: 968-973   2010.4

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  187. Nanoscale Friction Behaviors of Hierarchical Superhydrophobic Structute of Diamond Like Carbon Films with Various Humidity Conditions Reviewed

    Young-Jun JANG, Hiroyuki KOUSAKA, Noritsugu UMEHARA

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   Vol. 4 ( 1 ) page: 336-343   2010

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  188. The evaluation of fracture energy at the interface between grilled fish protein and metal Reviewed

    Naoko HONDA, Noritsugu UMEHARA, Takayuki TOKOROYAMA, Ryusei OHASHI and Akira HANAFUSA

    Tribology Online   Vol. 5 ( 1 ) page: 46-51   2010

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  189. Reduction of adhesion between steel and grilled fish protein with Ultra-Hydrophobic DLC Reviewed

    Naoko HONDA, Makoto KAJIYA, Young-Jun JANG, Hiroyuki KOUSAKA, and Noritsugu UMEHARA

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   Vol. 4 ( 1 ) page: 356-364   2010

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  190. Effect of micro-scale Young's modulus and surface roughness on adhesion property to plasma-treated rubber surface Reviewed

    Jong-Hyoung Kim, Noritsugu Umehara, Hiroyuki Kousaka, Mamoru Shimada and Mitsuru Hasegawa

    Journal of Mechanical Science and Technology   Vol. 24   page: 119-122   2010

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  191. Reduction of adhesion force between chloride-isobutene rubber and stainless steel ball after oxygen plasma treatment Reviewed

    Jong-Hyoung Kim, Hiroyuki Kousaka, Noritsugu Umehara, Mamoru Shimada, Mitsuru Hasegawa

    Journal of Materials and Manufacturing Processes   Vol. 4 ( 1 ) page: 336-343   2010

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  192. Nanowear characteristics of carbon nanotube film made by surface decomposition of SiC Reviewed

    Yosuke Tsukiyama, Noritsugu Umehara, Michiko Kusunoki

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   Vol. 4 ( 1 ) page: 373-382   2010

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  193. Development of functional surface by nano-plastic forming Reviewed

    Masahiko Yoshino, Noritsugu Umehara and Sivanandam Aravindan

    Wear   Vol. 266   page: 581-584   2009

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  194. Experimental and Numerical Simulation Study on Low-Surface Energy Slider with Thermal Flying-Height Control Function Reviewed

    Y. Shimizu, K. Ono, N. Umehara, and X. Junguo

    IEEE TRANSACTIONS ON MAGNETICS, 45 (2009), 10, 2620-3623.   Vol. 45 ( 10 ) page: 2620-2623   2009

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  195. Lapping of Glass Plate with Magnetic Fluid and Magnetic Field Reviewed

    Noritsugu Umehara, Hideki Aoyagi and Akira Shimomura

    Trans. of the JSME, C   Vol. 75 ( 757 ) page: 2423-2428   2009

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  196. The Influence of Micro-Grooves for Friction Dependant on Sliding Velocity in Sliding Bearing under Oil Lubrication Reviewed

    Shotaro Ozu, Takayuki Tokoroyama, Atsushi Korenaga, Shinya Sasaki and Noritsugu Umehara

    Trans. of the JSME, C   Vol. 75 ( 754 ) page: 1866-1871   2009

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  197. Influence of the Carbon-Overcoat on CNx Coating for the friction and Wear Properties Reviewed

    Huaipemg Wang, Takayuki Tokoroyama, Noritsugu Umehara and Yoshio Fuwa

    Trans. of the JSME, C   Vol. 75 ( 754 ) page: 1859-1865   2009

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  198. Super low Friction Phenomena of Carbon Nitride Coatings Lubricated under 18 Carbon Atoms Unsaturated Fatty Acids Reviewed

    Takayuki Tokoroyama, Noritsugu Umehara, Yuichiro Ogawa and Yoshio Fuwa

    Trans. of the JAST   Vol. 54 ( 6 ) page: 406-411   2009

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  199. Super low Friction Phenomena of Carbon Nitride Coatings in Oil Lubrication Reviewed

    Yuichiro Ogawa, Takayuki Tokoroyama, Noritsugu Umehara and Yoshio Fuwa

    Trans. of the JSME, C   Vol. 75 ( 752 ) page: 1088-1093   2009

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  200. Tribological Characteristics in 40 um Dimple Pattern for Hexagonal Array Reviewed

    Won Sik Choi, Toung Hoon Chae and Noritsugu Umehara

    Journal of the KSTLE   Vol. 25 ( 1 ) page: 25-30   2009

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  201. *ゴムと鋼の付着特性の影響因子の解明と制御手法の提案 Reviewed

    神谷友康,梅原徳次,中村研八

    日本機械学会論文集(C編   Vol. 74 ( 737 ) page: 192-197   2008

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    ゴムと鋼の付着に両面の表面エネルギーの極性基が重要であることを示し付着力減少のための鋼の表面処理の指針を明らかにした。更に、電圧印加による付着力の新低減方法を提案した。

  202. Wetting and Adhesion Behaviors of a-C:H Film Deposited on Nano-Scale Copper Dotted Surfaces Reviewed

    Young-Jun Jang and Norisugu Umehara

    Tribology Online   Vol. 3 ( 5 ) page: 294-297   2008

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  203. Friction and Wear Characteristics of Composite Materials for Architectural Membrane Reviewed

    Friction and Wear Characteristics of Composite Materials for Architectural Membrane

    Tribology Online   Vol. 3 ( 7 ) page: 376-380   2008

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  204. Strength at the Interface of CNT Films Made by Surface Decomposition of SiC Reviewed

    Yosuke Tsukiyama, Noritsugu Umehara and Michiko Kusunoki

    Tribology Online   Vol. 3 ( 7 ) page: 352-355   2008

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  205. In Situ Analysis of the Tribochemical Reaction of CNx by FTIR Reviewed

    Shingo Kanda, Takayuki Tokoroyama, Noritsugu Umehara and Yoshio Fuwa

    Tribology Online   Vol. 3 ( 2 ) page: 100-104   2008

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  206. Relationship between Real Contact Area and Adhesion Force of Plasma-Treated Rubber Sheets Against Stainless-Steel Ball Reviewed

    Jong-Hyoung Kim, Isami Nitta, Noritsugu Umehara, Hiroyuki Kousaka, Mamoru Shimada and Mitsuru Hasegawa

    Tribology Online   Vol. 3 ( 7 ) page: 361-365   2008

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  207. 大気中におけるCNx膜の摩擦摩耗特性の基板温度による制御 Reviewed

    吉川雄也,野老山貴行,梅原徳次

    日本機械学会論文集(C編)   Vol. 747 ( 74 ) page: 2791-2796   2008

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  208. 表面マイクロパターニングによるトライボロジー特性の改良 Reviewed

    梅原徳次

    機械の研究,60,8(2008), 843-849   Vol. 60 ( 8 ) page: 843-849   2008

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  209. Hydrogen-free carbon thin films prepared by new type surface-wave-sustained plasma (SWP) Reviewed

    Junqi Xu, Huiqing Fan, Hiroyuki Kousaka, Noritsugu Umehara and Weiguo Liu

    Surface and Coatings Technology   Vol. 201 ( 15 ) page: 6631-6634   2007

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  210. Evaluating Shaver Sharpness by Measuring the Pulling Force on Artificial Hair Reviewed

    T. Tokoroyama, Norhaswira MOHD, Noritsugu UMEHARA

    Journal of Advanced Mechanical Design, Systems, and Manufacturing, JSME   Vol. 1 ( 5 ) page: 661-668   2007

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  211. MAGIC砥石製作過程の数値解析(球形粒子体積分率の粒子分布への応用) Reviewed

    井門康司,稲垣貴文,梅原徳次

    日本AEM学会誌   Vol. 15 ( 3 ) page: 341-347   2007

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  212. 超微細塑性加工による単結晶純銅の結晶方位の変化 Reviewed

    吉野雅彦,南 那由多,木村英彦,松村 隆,梅原徳次

    日本機械学会論文集(A編   Vol. 73 ( 733 ) page: 1052-1057   2007

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  213. Tribology Properties Densely Packed Vertically Aligned Carbon Nanotube film on SiC Formed by Surface Decomposition Reviewed

    Koji Miyake, Michiko Kusunoki, Hatsuhiko Usami, Noritsugu Umehara and Shinya Sasaki

    Nano Letters   Vol. 7 ( 11 ) page: 3285-3289   2007

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  214. ナノ構造を制御したカーボン系材料としてのフラーレン及びナノチューブのトライボロジー Invited Reviewed

    梅原徳次

    真空   Vol. 50 ( 2 ) page: 76-81   2007

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  215. Growth and properties of hydrogen-free DLC films deposited by surface-wave-sustained plasma Reviewed

    Junqi Xu, Huiqing Fan, Hiroyuki Kousaka, Noritsugu Umehara, Dongfeng Diao and Weiguo Liu

    Diamond and Related Materials   Vol. 16 ( 1 ) page: 161-166   2007

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  216. CNx膜とステンレス鋼の摩擦摩耗特性に及ぼす印加電圧の影響 Reviewed

    山本崇寛、梅原徳次、不破良雄

    トライボロジスト   Vol. 51 ( 12 ) page: 900-905   2006

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  217. 磁場・電場を用いた研磨の制御 Invited Reviewed

    梅原徳次、赤上陽一

    トライボロジスト   Vol. 51 ( 7 ) page: 506-511   2006

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  218. Proposal for Die Polishing Using a New Bonding Abrasive Type Grinding Stone: Development of MAGIC Grinding Stone Reviewed

    S. Hagiwara, N. Kawashima, N. Umehara and I. Shibata

    Machining Science and Technology   Vol. 4   page: 267-279   2006

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  219. *A new apparatus for finishing large size/large batch silicon nitride (Si3N4) balls for hybrid bearing applications by magnetic float polishing (MFP) Reviewed

    N. Umehara, T. Kirtane, R. Gerlich, V.K. Jain and R. Komanduri

    International Journal of Machine Tools & Manufacture   Vol. 46   page: 151-169   2006

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  220. Air-bearing surface chemical modification for low-friction head–disk interface Reviewed

    Yuki Shimizu, Junguo Xu, Shozo Saegusa and Noritsugu Umehara

    Microsystem Technologies   Vol. 1   2006

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  221. Development of electrically controlled polishing with dispersion type ER fluid under AC electric field Reviewed

    Yoichi Akagami and Noritsugu Umehara

    Wear   Vol. 260 ( 3 ) page: 345-350   2006

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  222. Engineering surface and development of a new DNA micro array chip Reviewed

    Masahiko Yoshino, Takashi Matsumura, Noritsugu Umehara, Yoichi Akagami, Sivanandam Aravindan and Takenori Ohno

    Wear   Vol. 260 ( 3 ) page: 274-286   2006

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  223. Extension of surface-wave-excited high-density plasma column sustained along graphite rod target Reviewed

    Hiroyuki Kousaka and Noritsugu Umehar

    Vacuum   Vol. 80 ( 7 ) page: 806-809   2006

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  224. Computer simulation of structures and distributions of particles in MAGIC fluid Reviewed

    Yongsheng Zhu, Noritsugu Umehara, Yasushi Ido and Atsushi Sato

    Journal of Magnetism and Magnetic Materials   Vol. 302 ( 1 ) page: 96-104   2006

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  225. Pressure dependence of surface wave-excited plasma column sustained along metal rod antenna Reviewed

    Hiroyuki Kousaka, Junqi Xu and Noritsugu Umehara

    Vacuum   Vol. 80 ( 11-12 ) page: 1154-1160   2006

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  226. Plasma properties of a new surface-wave-sustained plasma source under the conditions of depositing DLC films Reviewed

    Junqi Xu, Hiroyuki Kousaka, Noritsugu Umehara and Dongfeng Diao

    Surface and Coatings Technology   Vol. 201 ( 1-2 ) page: 408-412   2006

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  227. Microwave-Excited High-Density Plasma Column Sustained along Metal Rod at Negative Voltage Reviewed

    . Kousaka, K. Ono, N. Umehara and J. Xu

    Japanese Journal of Applied Physics   Vol. 44 ( 36 ) page: L1154-1157   2005

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  228. CNx膜(窒化炭素膜)軸受実用化のため応用研究 Invited

    梅原徳次、野老山貴行、冨田博嗣

    潤滑経済   Vol. 4   page: 16-20   2005

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  229. 機能性表面創製技術とトライボロジー Invited Reviewed

    梅原徳次

    トライボロジスト   Vol. 50 ( 8 ) page: 572-577   2005

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  230. CNx膜によるすべり軸受の低摩擦化 Invited

    梅原徳次、野老山貴行、冨田博嗣

    月刊トライボロジー   Vol. 8   page: 19-21   2005

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  231. CNx膜の摩擦特性に及ぼす雰囲気ガスの影響と超低摩擦実現のための酸素濃度限界 Reviewed

    野老山貴行、中村隆、梅原徳次、冨田博嗣、竹之下雪徳

    トライボロジスト   Vol. 50 ( 9 ) page: 683-689   2005

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  232. Generation of Long and High-Density Plasma Column Using Metal-Antenna Surface Wave-Excited Plasma Sourc Reviewed

    H. Kousaka, J. Xu and N. Umehara

    Japanese Journal of Applied Physics   Vol. 44 ( 33 ) page: L1052-1055   2005

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  233. 摩耗研究から磁場援用研磨加工のビジネス化に向けて Invited Reviewed

    梅原徳次、芝田 勲

    トライボロジスト   Vol. 49 ( 2 ) page: 213-219   2004

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    Authorship:Lead author   Language:Japanese  

  234. Friction, wear and N2-lubrication of carbon nitride coatings : a review Invited Reviewed

    K. Kato, N. Umehara, K. Adachi

    Wear   Vol. 254   page: 1062-1069   2003

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    Language:English  

  235. CNx(窒化炭素)による潤滑技術 Invited

    梅原徳次

    潤滑経済   Vol. 4   page: 11-16   2003

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    Authorship:Lead author   Language:Japanese  

  236. CNx硬質皮膜の微視的損傷メカニズム Invited Reviewed

    梅原徳次

    トライボロジスト   Vol. 48 ( 10 )   2003

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  237. 窒化炭素膜の極低摩擦現象に及ぼす相手面表面粗さと移着膜の影響 Reviewed

    野老山貴行,梅原徳次,冨田博嗣,竹之下雪徳

    日本機械学会論文集(C編   Vol. 69 ( 686 ) page: 2824-2829   2003

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  238. MAGIC Polishing Reviewed

    N. Umehara

    Journal of Magnetisms and Magnetic Materials   Vol. 252   page: 341-343   2002

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  239. MAGIC砥石の特徴と可能性

    梅原徳次,萩原親作,芝田勲,川嶋徳道

    機械と工具   Vol. 10   page: 2-10   2002

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    Authorship:Lead author   Language:Japanese  

  240. 摩耗低減のためのコーティング膜の設計指針 Invited

    梅原徳次

    NOK技術技報   Vol. 10   page: 2-10   2002

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    Authorship:Lead author   Language:Japanese  

  241. 金型研磨の進展とトライボロジー Invited

    清水友治,岩渕明,梅原徳次

    トライボロジスト   Vol. 47 ( 6 ) page: 436-442   2002

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    Language:Japanese  

  242. Failure Modes of Carbon Nitride Coated Steel During Rolling Contact Reviewed

    Byung Young Choi, Koji Kato and Noritsugu Umehara

    J. of Kor. Instn. Met. and Mater.   Vol. 39 ( 9 ) page: 1016-1019   2001

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    Publishing type:Research paper (scientific journal)  

  243. 均一に配列させたマイクロ多刃工具による仕上げ加工の可能性  -異方性エッチングによるマイクロ多刃工具からMAGIC砥石へ- Invited

    梅原徳次

    砥粒加工学会誌   Vol. 45 ( 6 ) page: 283-287   2001

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  244. 磁場による砥粒制御と磁気配向性複合体によるエコ加工 Invited

    梅原徳次

    フルイドパワーシステム   Vol. 32 ( 3 ) page: 414-418   2001

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    Authorship:Lead author   Language:Japanese  

  245. イオンビームミキシング成膜法によるa-CNx膜のトライボロジー特性 Invited

    梅原徳次

    月刊トライボロジー   Vol. 8   page: 20-22   2001

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  246. MAGIC 砥石の開発とその応用(第1報)   -磁場配列を利用した新しい砥石による研磨の原理と基本特性ー Reviewed

    梅原徳次,萩原親作,芝田勲,枝村一弥

    砥粒加工学会誌   Vol. 45 ( 9 ) page: 431-436   2001

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  247. Effect of Coating Thickness on Rolling Contact Fatigue of CNx coated Steel Reviewed

    Byung Young Choi and Noritsugu Umehara

    J. of the Korean Society for Heat Treatment   Vol. 13 ( 5 ) page: 355-359   2000

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    Publishing type:Research paper (scientific journal)  

  248. 原子間力顕微鏡(AFM)によるナノメータスケールの摩耗機構の研究 Invited

    梅原徳次

    機械の研究   Vol. 52 ( 4 ) page: 430-438   2000

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    Authorship:Lead author   Language:Japanese  

  249. Micro-Wear Properties of Carbon Nitride Coatings Reviewed

    K. Kato, H. Koide and N. Umehara

    Wear   Vol. 238   page: 40-44   2000

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    Language:English   Publishing type:Research paper (scientific journal)  

  250. 粒子分散型機能性流体を用いた精密研磨方法の開発 Reviewed

    赤上陽一,浅利孝一,藤田豊久,B.ジャヤデワン,梅原徳次

    日本機械学会論文集(C編)   Vol. 66 ( 649 ) page: 3168-3173   2000

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  251. Nanoindentation and FEM study of the effect of internal stress on micro/nano mechanical property of thin CNx films Reviewed

    M. Bai, K. Kato, N. Umehara, Y. Miyake, J. Xu, H. Tokisue

    Thin Solid Films   Vol. 376 ( 1-2 )   2000

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    Language:English   Publishing type:Research paper (scientific journal)  

  252. Friction and wear properties of hard coating materials on textured hard disk sliders Reviewed

    L. Zhou, K. Kato, N. Umehara, Y. Miyake

    Wear   Vol. 243   page: 133-139   2000

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    Language:English   Publishing type:Research paper (scientific journal)  

  253. Mechanical characterization and tribological evaluation of ion-beam-assisted sputter coatings of carbon with nitrogen incorporation Reviewed

    Dong F. Wang, Koji Kato and Noritsugu Umehara

    Surface and Coatings Technology   Vol. 123 ( 2-3 ) page: 177-184   2000

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    Language:English   Publishing type:Research paper (scientific journal)  

  254. The effects of texture height and thickness of amorphous carbon nitride coating of a hard disk slider on the friction and wear of the slider against a disk Reviewed

    Lin Zhou, Koji Kato, Noritsugu Umehara and Yoshihiko Miyake

    Tribology International   Vol. 33 ( 9 ) page: 665-672   2000

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    Language:English   Publishing type:Research paper (scientific journal)  

  255. トライボロジーと研磨技術 Invited

    梅原徳次

    表面技術協会誌   Vol. 49 ( 9 ) page: 922-927   1998

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    Authorship:Lead author   Language:Japanese  

  256. トライボロジーのかくれた主役:接触面間のミクロ粒子 Invited

    梅原徳次

    日本機械学会誌   Vol. 101 ( 952 ) page: 160-161   1998

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    Authorship:Lead author   Language:Japanese  

  257. 磁性流体研磨 Invited

    梅原徳次

    トライボロジスト   Vol. 41 ( 6 ) page: 476-481   1996

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  258. 浮子を用いた磁性流体研磨 Invited

    梅原徳次,加藤康司

    トライボロジスト   Vol. 36 ( 6 ) page: 434-439   1991

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    Authorship:Lead author   Language:Japanese  

  259. 従来より100倍早いセラミック球研磨法 Invited

    加藤康司,梅原徳次

    Trigger(別冊)     page: 134-135   1989

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▼display all

Books 17

  1. Novel Magnetic Fluid Polishing with the Control of Force and Distribution of Non-magnetic Abrasives International journal

    Umehara N.( Role: Joint author)

    Material Aspects of Ferrofluids  2023.1  ( ISBN:9781032227986

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    Language:English Book type:Scholarly book

    Magnetic fluid has attractive properties that can be applied to machines and devices. Magnetic fluid seal, magneto hydrostatic separation and dampers are successful examples that have been invented in the past. However, magnetic fluid has not been well applied in manufacturing. Childs and Yoon have calculated a float’s magnetic field and magnetic buoyant force using a finite difference method. However, in their method, the physical meaning of each effect of magnetic fluid properties, magnet properties and apparatus geometry on the magnetic field and magnetic buoyant force of a float could not be understood easily. In order to polish the aspherical glass lens in a proper shape and smooth surface, a local area of 1 mm is needed to be polished uniformly. For polishing such a tiny area, the moving stroke of the tip tool is also tiny less than 1 mm. Hence the distribution of free abrasives on the tip tool should be uniform.

    DOI: 10.1201/9781003274247-7

    Scopus

  2. 炭素繊維およびその繊維複合材料における分析試験,評価解析に関する最新事例集

    梅原徳次他71名( Role: Contributor)

    (株)技術情報協会  2019.6 

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    Total pages:987   Language:Japanese Book type:Scholarly book

  3. Subtractive Processes - Non-Traditional Operations

    Yamaguchi H., Williams R., Wang J., Shih A., Altena H., Lei S., Kuriyagawa T., Umehara N.

    Handbook of Manufacturing  2019.1  ( ISBN:9789813271012

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    Language:Japanese

    DOI: 10.1142/9789813271029_0003

    Scopus

  4. 数値解析と表面分析によるトライボロジーの解明と制御

    佐々木信也、梅原徳次、他83名( Role: Joint author ,  第1節摩耗の基礎)

    (株)テクノシステムズ  2018.3 

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    Language:Japanese Book type:Scholarly book

  5. 数値解析と表面分析によるトライボロジーの解明と制御

    佐々木信也, 梅原徳次( Role: Joint author ,  第1節摩耗の基礎)

    (株)テクノシステムズ  2018.3 

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    Responsible for pages:37-45   Language:Japanese Book type:Scholarly book

  6. DLCの基礎と応用展開

    梅原徳次他共著( Role: Sole author)

    株)シーエムシー出版  2016.6 

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    Language:Japanese Book type:Scholarly book

  7. CFRPの繊維/樹脂界面制御の成形加工技術

    梅原徳次、他53名( Role: Joint author)

    (株)技術情報協会  2015.5  ( ISBN:978-4-86104-587-5

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    Language:Japanese

  8. MICRO-NANO MECHATRONICS

    Toshio Fukuda, Tomohide Niimi and Goro Obinata, Noritsugu Umehara and so on( Role: Joint author)

    INTECH  2013.3  ( ISBN:978-953-51-1104-7

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    Language:English

  9. 機械屋のための分析装置ガイドブック 日本塑性加工学会編

    梅原徳次,吉野雅彦,他29名( Role: Joint author)

    コロナ社  2012.8  ( ISBN:978-4-339-04626-7

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    Language:Japanese

  10. 微細構造から考える表面機能

    諸貫信行,菊田久雄,梅原徳次,太田稔,枡田正美( Role: Joint author)

    工業調査会  2010.4  ( ISBN:978-4-7693-1292-5

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    Language:Japanese

  11. 固体潤滑ハンドブック

    梅原徳次,他57名( Role: Joint author)

    養賢堂  2009.12 

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    Language:Japanese

  12. エレクトロニクス用途におけるガラスの超精密加工 技術全集

    梅原徳次他49名( Role: Joint author)

    技術情報協会  2008.3 

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    Language:Japanese

  13. トライボロジーの新展開と応用

    梅原徳次他共著( Role: Joint author)

    (株)シーエムシー出版  2007 

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    Language:Japanese

  14. 微細加工と表面機能

    梅原徳次他共著( Role: Joint author)

    リアライズ社  2007 

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    Language:Japanese

  15. セラミックスのトライボロジー -基礎と応用-

    梅原徳次他共著( Role: Joint author)

    養賢堂,日本トライボロジー学会編  2003 

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    Language:Japanese

  16. 薄膜の機械的特性と評価・制御技術

    梅原徳次他共著( Role: Joint author)

    技術情報協会  2001 

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    Language:Japanese

  17. Magnetic Fluid and Application Handbook.

    B. Berkovski, V Bashtovoy, K.Kato, N. Umehara et al.( Role: Joint author)

    UNESCO, Begell House Publishers, New York  1996 

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    Language:English

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MISC 5

  1. 光学特性から推定した分極率による低摩擦メカニズムの力学的解明を目指して(学会賞受賞論文のポイント) Invited

    梅原 徳次

    日本機械学会誌   Vol. 126 ( 1252 ) page: 38 - 39   2023.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemag.126.1252_38

    CiNii Research

  2. 異なる表面粗さを有する金属表面においてゴムの劣化が静止摩擦に及ぼす影響—The Effect of Rubber Deterioration on Static Friction on Metal Surfaces with Different Surface Roughness Characteristics Invited

    村島 基之, 佐宗 朋洋, 梅原 徳次, 野老山 貴行, 平野 遼, 沖舘 亮

    日本パーカライジング技報 = Technical report / Nihon Parkerizing Co., Ltd   ( 35 ) page: 25 - 38   2023

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    Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:日本パーカライジング総合技術研究所  

  3. コーティング電気メス先端の炭化物付着抑制手法の開発—Preventing Coagulated-Blood Adhesion on a Coated Electrosurgical Knife Invited

    野老山 貴行, 小林 将大, 村島 基之, 梅原 徳次, 小川 航生, 萬 隆行, 内田 淳一

    日本パーカライジング技報 = Technical report / Nihon Parkerizing Co., Ltd   ( 33 ) page: 3 - 11   2021

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    Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:日本パーカライジング総合技術研究所  

  4. The Surface Enhanced Raman Scattering Analysis for Carbonaceous Coating by Using Au Nano-Particles Invited

    TOKOROYAMA Takayuki, MURASHIMA Motoyuki, UMEHARA Noritsugu

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   Vol. 65 ( 8 ) page: 517 - 525   2020.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:Japanese Society of Tribologists  

    <p>In general, Raman analysis is one of the useful candidates to obtain structure of carbonaceous coatings. To improve the depth resolution of Raman analysis, surface-enhanced Raman scattering (SERS) using gold nanoparticles (Au nanoparticles: AuNPs) and Au sputtered particles were investigated. The analysis was conducted to approximately 1.7, 2.4, 4.7, and 10.0 nm thickness of carbon coatings on silicon substrate with a 532 nm incident wavelength laser. The results indicated that the underlying silicon substrate was detected in the results of the Au sputtering method. Contrastingly, the underlying silicon substrate was not detected by the AuNPs method. This result clarified that using the AuNPs method, the detection depth of the carbon film was approximately 1.7 nm or less. The a-C:H coating was processed using a calotester, and SERS measurements at different depths were performed for the 633 and 532 nm wavelengths using the AuNPs method. As a result, the <i>I</i><sub>G </sub>peak position tended to increase from the vicinity of the inter face between the a-C:H coating and the substrate to the surface. In addition, the <i>I</i><sub>D</sub>/<i>I</i><sub>G </sub>ratio was as low as 0.28 near the substrate and 0.72 at 3800 nm.</p>

    DOI: 10.18914/tribologist.20-00001

    CiNii Research

  5. プラズマイオンプロセスによる薄膜製造技術

    上坂 裕之, 梅原 徳次

    機械の研究 = Science of machine   Vol. 69 ( 8 ) page: 651 - 660   2017.8

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    Language:Japanese   Publisher:養賢堂  

    CiNii Books

Presentations 15

  1. Evaluation of the Effect of Tribofilm Derived from MoDTC on Friction Properties of ta-C Coating by Using in-situ Reflectance Observation Invited International conference

    Noritsugu Umehara

    8th Internnational Conference on Mechanics and Materials in Designb Integrity, Reliabiloity and Failure  2022.7.28 

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    Event date: 2022.7

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Funchal   Country:Portugal  

  2. Effect of Fracture Properties and Surface Morphology on Wear of DLC Coatings at Severe Contact Condition Invited International conference

    Noritsugu Umehara

    The 8th Mechanical Engineering Research Day  2022.7.13 

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    Event date: 2022.7

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Malaysia  

  3. Improvement of surface quality with solid lubricating sheet for drilling aircraft materials Invited International conference

    Noritsugu Umehara

    K-TRIB2020 2nd Korea-Tribology International Symposium  2020.11.29 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Korea, Republic of  

  4. In-situ observation of friction surface with reflectance spectroscopy Invited International conference

    Noritsugu Umehara

    MERD 20  2020.12.16 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Malaysia  

  5. ベース油中CNx の摩擦界面その場反射分光分析観察による 摩擦メカニズムの解明 Invited

    梅原徳次

    トライボロジー会議2020秋 別府  2020.11.2  日本トライボロジー学会

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    Event date: 2020.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  6. "FRICTIONLESS" DIAMOND-LIKE COATINGS ANDIN-SITU OBSERVATION USINGREFLECTANCESPECTROSCOPY Invited International conference

    Noritsugu Umehara

    7th Internnational Conference on Integrity, Reliabiloity and Failure  2020.9.6 

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    Event date: 2020.9

    Language:English   Presentation type:Oral presentation (keynote)  

    Venue:Funchal   Country:Portugal  

  7. カーボン系材料薄膜の超低摩擦現象

    梅原徳次

    2008年秋季第69回応用物理学会学術講演会シンポジウム 

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    Event date: 2008.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  8. Effect of Electric Field on Friction Properties of DLC Films during Lubrication

    KINDT Sean, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki

    The Proceedings of the Machine Design and Tribology Division meeting in JSME  2021  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    <p>In recent years, an increase of energy efficiency of machines became worldwide request. Therefore, the reduction of friction loss in the sliding part has become an urgent issue. Generally, under high pressure conditions, the oil thickness decreases, resulting in a boundary lubrication condition where direct contact between two sliding surfaces occurs, and the friction coefficient increases. In order to reduce friction in this boundary lubrication condition, diamond-like carbon (DLC) coatings, which are carbon-based hard coatings, has many applications parts. The present paper demonstrates a fundamental study of a new method using electronic field at contact surfaces. We conducted the friction test using a pin-on-disk friction tester. The friction tester had a SUJ2 ball or ta-CNx-coated ball and a soda-lime glass plate. We used 30-μL propylene glycol (PG) as lubricant, and applied DC voltage to contact area during the friction tests. As a result, the friction test with the ta-CNx-coated ball showed a low friction coefficient but no lower friction by electronic field. On the other hand, the electric bias reduced the friction coefficient with the SUJ2 ball.</p>

    DOI: 10.1299/jsmemdt.2021.20.2211

    CiNii Research

  9. Effect of nitrogen gas supply to graphite target on properties of ta-CNx films deposited by FCVA method International coauthorship

    GOTO Taiga, Woo-Young Lee, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki

    The Proceedings of Mechanical Engineering Congress, Japan  2022  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    <p>It has been reported that ta-CNx coatings deposited by the IBA-FAD method show excellent low friction and wear properties, however the hardness decreases with the N/C ratio in the coating. Although, using an ion gun to mix nitrogen in the coating gives several pros to the coating, however, it rises initial cost of equipment. To overcome this situation, nitrogen ion generation by just supplying nitrogen gas close to an arc discharge area which is used in the FAD carbon ion generation was suggested by authors. The supplied nitrogen gas is ionized by the high voltage arc which is supplied to a graphite target. The effects on the N/C ratio was measured by AES, hardness was measured by nano-indentation tester, and tribological properties of the deposited ta-CNx coatings were examined. The results showed that ta-CNx coatings deposited by nitrogen gas supply method showed higher hardness than ordinally nitrogen ion beam deposition method.</p>

    DOI: 10.1299/jsmemecj.2022.s114-01

    CiNii Research

  10. Clarification of effect of a-C:H film’s hardness on wear characteristic of a-C:H under lubrication with MoDTC additives

    YASUGATA Hiasanori, UMEHARA Noritugu, MURASHIMA Motoyuki, TOKOROYAMA Takayuki, LEE Wooyoung, SHIROTANI Tomoyasu, IZUMIDA Manabu, WATANABE Airi, KATSUKI Hiromitu

    The Proceedings of Mechanical Engineering Congress, Japan  2021  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    <p>In this study, the effect of hardness on the wear characteristics of a-C:H films under MoDTC-containing lubrication was investigated. a-C:H films with hardness of Hv300, 600, 800 and 1200 were friction-tested with SUJ2 balls under base oil lubrication and MoDTC-containing lubrication. Under MoDTC lubrication, the a-C:H films with Hv300, 600, and 800, which have lower hardness than SUJ2 balls, showed higher specific wear than those under base oil lubrication. On the other hand, the a-C:H film of Hv1200, which has higher hardness than SUJ2 balls, shows a convex shape in the wear traces and the specific wear becomes negative. The EDS element mapping results showed that the molybdenum and sulfur reactions in the wear marks of the Hv1200 a-C:H film were clearer than those in the wear marks of the Hv300, 600, and 800 a-C:H films. The Vickers hardness of the SUJ2 balls used in this study was about Hv860, suggesting that the hardness of the mating material affects the wear properties of the a-C:H film.</p>

    DOI: 10.1299/jsmemecj.2021.s116-29

    CiNii Research

  11. Effect of UV irradiation on oxygen desorption in ta-C:Ta coatings

    TANIGAWA Asato, TOKOROYAMA Takayuki, UMEHARA Noritsugu, MURASHIMA Motoyuki

    The Proceedings of Mechanical Engineering Congress, Japan  2022  The Japan Society of Mechanical Engineers

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    <p>In recent years, the demand for lubrication in the atmosphere has been increasing, and carbon-based hard coatings Diamond-like Carbon (DLC) have been attracted attention. A tetrahedral type of DLC with tantalum (ta-C:Ta) has been exhibited ultra-low friction approximately 0.07 in the atmosphere. The friction coefficient is thought to decrease due to an increase in the graphite structure at the topmost surface which was formed by desorption of oxygen from carbon or tantalum and restructuring of carbon structure. Which is assumed to be driven by energy from the application of frictional heat or shearing. If the oxygen desorption phenomenon described above can be realized by applying energy other than friction, low friction can be obtained without friction beforehand. It has been reported that irradiating CNx coatings with ultraviolet light desorbs nitrogen atoms from the surface of the CNx coating, reducing the initial friction period by 91 %.</p><p>In this study, we clarified the effect of UV irradiation on the oxygen desorption in the ta-C:Ta0.024 coating (Ta content was 0.024) . AES and XPS revealed that UV irradiation caused C-O bond cleavage and oxygen desorption.</p>

    DOI: 10.1299/jsmemecj.2022.s115-26

    CiNii Research

  12. The Micro-meter-sized plastic texture made by PVC with carbon black and AC electric field to enhance thermal conductivity International coauthorship

    Zhang Liying, Tokoroyama Takayuki, Yamada Yusei, Murashima Motoyuki, Umehara Noritsugu

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP  2022  The Japan Society of Mechanical Engineers

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    Language:English   Presentation type:Oral presentation (general)  

    <p>In this study, we created a microplastic texture by a mixture of PVC (polyvinyl chloride)-acetone and carbon black (CB) solution at an alternative high voltage. The results showed that the contact angle when high voltage of 2 kV was applied was greater than that when no voltage was applied, and the surface contact angle showed a maximum of 142° when the CB concentration was 1.5 wt.% and the applied frequency was 0 Hz, while the surface head convex structure was found when the CB was 1.5 wt.% at 10 Hz when observed by field emission scanning electron microscopy (FE-SEM). And it was found that the surface spherical structure was sharper when the frequency was applied at 10 Hz than 5 Hz.</p>

    DOI: 10.1299/jsmeiip.2022.iip2r3-h08

    CiNii Research

  13. In –situ analysis of two phase lubricant oil film with a reflectance spectroscopy

    YAMADA Takazumi, UMEHARA Noritsugu, TOKOROYAMA Takayuki, MURASHIMA Motoyuki, Sato Taku, Ohara Kenji, Hanyuda Kiyoshi

    The Proceedings of Mechanical Engineering Congress, Japan  2018  The Japan Society of Mechanical Engineers

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    Language:Japanese   Presentation type:Oral presentation (general)  

    <p>Two phase lubricant has attracted attention as a lubricant oil with little change in viscosity with temperature change. The two phase lubricants consist of the low and high viscosity base oils which are miscible at high temperature but not at lower temperature.For exmaple, Mineral or synthetic base oil are used as a low viscosity lubricant and PAG is used as a high viscosity lubricant for two phase lubricant. In the high temperature region, PAG is mixed into mineral or synthetic base oil and the viscosity reduction is relieved. However, with this two phase lubricant, the structure and frictional characteristics of the oil film at the sliding part have not been elucidated. In this paper, in-situ analysis of the oil film formed on the friction surface was carried out using a reflection spectroscopic film thickness meter. In addition, focusing on the difference in molecular structure between PAG and PAO, oil film analysis was carried out using an oil film model having a three-layer structure in which a PAG adsorption layer having a functional group and a polar molecule exists. As a result of using two phase lubricant, it was shown that the frictional characteristics with temperature change are different.</p>

    DOI: 10.1299/jsmemecj.2018.s1110201

    CiNii Research

  14. Application of oil palm fiber in organic brake friction composite material International coauthorship International conference

    Bin Abdollah Mohd Fadzli, Amiruddin Hilmi, Nordin Mohamad Jabbar, Tokoroyama Takayuki, Umehara Noritsugu

    PROCEEDINGS OF MECHANICAL ENGINEERING RESEARCH DAY 2020 (MERD'20)  2020 

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    Presentation type:Oral presentation (general)  

  15. Important and Potential Field for Future Sustainable Development Additional Tips: Research to Publication Invited International conference

    Noritsugu Umehara

    UTiM Special lecture  2022.7.14 

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    Language:English   Presentation type:Oral presentation (keynote)  

    Country:Malaysia  

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Research Project for Joint Research, Competitive Funding, etc. 16

  1. ナノ構造を制御したカーボン系硬質膜の超低摩擦

    2020.4

    二国間交流事業(中国(NSFC)との共同研究) 

  2. 地熱発電技術研究開発/地熱エネルギーの高度利用化に係る技術開発/酸性熱水を利用した地熱発電システム実現に向けた耐酸性・低付着技術の研究開発

    2018.11

    NEDO 

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    Grant type:Competitive

  3. 地熱発電技術研究開発/地熱エネルギーの高度利用化に係る技術開発/酸性熱水を利用した地熱発電システム実現に向けた耐酸性・低付着技術の研究開発

    2018.11

    NEDO 

    富士電機

      More details

    Authorship:Principal investigator  Grant type:Collaborative (industry/university)

    Grant amount:\11710680 ( Direct Cost: \11631000 、 Indirect Cost:\79680 )

  4. エンジン軸受における境界潤滑領域での低摩擦を持続するスマートトライボ表面の開発

    2018.4 - 2019.3

    国内共同研究 

  5. カーボン系硬質膜の超低摩擦及び耐焼付性向上の指針の提案と実証

    2014.10 - 2019.3

    戦略的イノベーション創造プログラム 

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    Grant type:Competitive

  6. カーボン系硬質膜の超低摩擦及び耐焼付性向上の指針の提案と実証

    2014.4 - 2019.3

    受託研究 

  7. (財)JKA 小型自動車等機械工学振興事業補助金

    2011.4 - 2012.3

    (財)JKA 小型自動車等機械工学振興事業補助金 

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    Grant type:Competitive

  8. 血液の凝固付着を抑制する冷却電気メスチップの最適設計・加工法の探索

    2011.4 - 2012.3

    平成23年度第1回「研究成果最適展開支援プログラム(A-STEP) 

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    Grant type:Competitive

  9. 内燃機関軸受へのダイヤモンドライクカーボン材料適用の研究開発

    2010.10 - 2013.3

    NEDO 省エネルギー革新技術開発事業 

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    Grant type:Competitive

  10. マイクロポリマーブラシによる低速・高面圧下水潤滑の実現

    2010.4 - 2011.3

    メカトロニク技術高度化財団 研究助成 

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    Grant type:Competitive

  11. ベースオイル中で超低摩擦・耐摩耗のための厚膜CNx膜の最適化

    2010.4 - 2011.3

    国内共同研究 

  12. 血液の凝固付着を抑制する複合材電気メスチップの開発

    2009.7 - 2010.3

    (独)科学技術振興機構シーズ発掘 

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    Grant type:Competitive

  13. ベースオイル中で超低摩擦・耐摩耗のいための厚膜CNx膜の最適化

    2009.4 - 2010.3

    国内共同研究 

  14. DLCの油中における摩耗特性とそれに及ぼす構造変化の影響

    2008.4 - 2009.3

    国内共同研究 

  15. 負電圧印加による電子パッケージ材料の金型への付着抑制

    2008.4

    (独)科学技術振興機構シーズ発掘 

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    Grant type:Competitive

  16. CNx膜の超低摩擦現象の工作機械摺道面への適用

    2007

    (独)科学技術振興機構シーズ発掘 

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    Grant type:Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 20

  1. Development of Smart Tribosystem with Friction Induced Transformed Thin Layers

    Grant number:25220902  2013.5 - 2018.3

    Umehara Noritsugu

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    Authorship:Principal investigator 

    Grant amount:\151450000 ( Direct Cost: \116500000 、 Indirect Cost:\34950000 )

    Carbonaceous hard coatings as DLC and CNx are attracted keen attention to show not only high wear resistance but also ultra low friction that is less than 0.01 of friction coefficient under severe sliding condition that liquid lubricants can not work. We developed two novel evaluation systems as the evaluation method of transformed layer of carbonaceous hard coatings with a reflective spectroscopy and the evaluation method of surface energy of sliding surface of carbonaceous hard coatings with an Environmental Scanning Spectroscopy. The first evaluation systems showed that thickness, roughness and mechanical properties of transformed layer of coatings governed ultra low friction phenomena with a thin solid film lubrication theory. The second evaluation system confirmed that low surface energy of sliding scar provided low friction properties. From both clear findings for ultra low friction of carbonaceous hard coatings, new carbonaceous hard coatings as ta-CNx coatings was proposed.

  2. Lubricant-less super-environmental adaptive engineering brought by in-situ generation of lubricats on friction surfaces

    Grant number:22K18751  2022.6 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

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    Authorship:Coinvestigator(s) 

  3. Development of design proposal for ultla low friction by controlling of permittivity of nano transformed layer and adsorbed lubricants on carbonaceous hard coating

    Grant number:18H03751  2018.4 - 2022.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Umehara Noritsugu

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\43550000 ( Direct Cost: \33500000 、 Indirect Cost:\10050000 )

    Carbonaceous hard coatings as DLC and CNx are attracted keen attention to show not only high wear resistance but also ultra low friction. However oil lubrication does not provide ultra low friction for DLC. In order to overcome this issue, we measured reflectance spectrum at friction area of CNx in-situ in PAO oil. After the estimation of polarizability of PAO oil and transformed layer, we found that the friction coefficient has strong relationship to the polarizability of PAO oil and transformed layer, that leads to the increasing of van der Waals force between transformed layer and PAO oil. The1.4 times of increasing of product of both polarizabilities provided 20 % reduction of friction coefficient. Also XPS analysis of transformed layer of CNx confirmed the change of bonding status. And then MD simulation showed the possibility of the change of density and bonding structure of Carbonaceous hard coating during friction.

  4. Development of efficient manufacturing process of nano/micro metal resonators and application for development of optical fuctional devices

    Grant number:17H01240  2017.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Yoshino Masahiko

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    Authorship:Coinvestigator(s) 

    In this project, we developed nano plastic forming method and micro machining method for machining of molds with sub-micrometer size microstructures, and produced plastic molds by hot pressing using these molds. Then, we demonstrated that ultrafine metallic elements of sub-micrometer size can be fabricated from the plastic mold at high efficiency and low cost by means of the transfer printing method. In addition, we investigated the SERS effect of the micro-rhombic Au thin film structures by numerical analysis and experiments in order to clarify the optical functions of ultrafine metallic structures. Through these studies, we had shown the possibility of nano/micro machining technologies to the development of optical functional devices.

  5. ループ型カーボン繊維マイクロブラシによる軽量・低起動トルクすべり軸受の提案

    2014.5 - 2017.3

    科学研究費補助金  挑戦的萌芽研究,課題番号:23630040

    梅原 徳次

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    Authorship:Principal investigator 

  6. Development of nano manufacturing technology by combination of nano machining and self organization technique, and application to development of optical function.

    Grant number:26249007  2014.4 - 2018.3

    Yoshino Masahiko

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    Authorship:Coinvestigator(s) 

    This research was aimed to develop low cost and efficient manufacturing technology for metallic elements of submicrometer size on quartz glass substrates. Firstly, a combined machining device capable of nano/micro cutting and nano plastic forming was developed. Nano structured diamond tools used on the combined machining device were also develope, and those machining characteristics were investigated. Then, it was shown that metallic elements that induce unique optical properties, such as metal nanodot arrays and double nanorod arrays, can be fabricated by combination of nano/micro machining and self-organization process. In addition, thermal nanoimprinting method to transfer a nano/micro structures fabircated on a mother mold to a plastic film was developed. Chemical stamping method using the plastic mold was also proposed. It was show that the chemical stamping method is capable for efficient production of metallic elements of nano/micro meter size.

  7. The study on the correlation between characteristics of soft metallic layer in frictional interface and the tribological properties of soft-metal/DLC nano-composite coatings

    Grant number:26420093  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    GOTO Minoru, UMEHARA Noritsugu, TOKOROYAMA Takayuki, KANO Makoto, MIKI Hiroyuki, TAKENO Takanori, FONTAINE Julien

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    In this study, a silver/diamond-like carbon nanocomposite coating (Ag-DLC) and a copper/diamond-like carbon nanocomposite coating (Cu-DLC) have been prepared by RF magnetron sputter process using a concentric composite target (CCT) which composed of carbon base target and Ag or Cu tablet. The metal concentration in the coatings varied from less than 10 at.% to over 70 at.%, depending upon the tablet size in CCT. The tribological properties of those coatings were compared with both Ag-DLC and Cu-DLC deposited by different coating method. As a result, it is found that both the structure and hardness of films were not depending on the deposition methods, but tribological properties varied depending on the composition of the tribofilm formed on the counterface of film.

  8. カーボン系硬質膜の超低摩擦発現ナノ構造変化層のその場評価法の開発とその応用

    2013.4 - 2016.3

    科学研究費補助金  基盤研究(A)

    梅原徳次

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    Authorship:Principal investigator 

  9. カーボンマイクロブラシ膜の電場印加による高摩擦・耐摩耗機能発現

    2011.5 - 2013.4

    科学研究費補助金  萌芽研究,課題番号:23656120

    梅原 徳次

      More details

    Authorship:Principal investigator 

  10. 無潤滑超低摩擦・耐摩耗カーボン系硬質膜の静摩擦係数減少のための設計指針の確立

    2010.4 - 2013.3

    科学研究費補助金  基盤研究(B),課題番号:22360069

    梅原 徳次

      More details

    Authorship:Principal investigator 

  11. 硬質膜のなじみ過程制御による超低摩擦と超耐摩耗を両立した硬質膜設計指針の確立

    2007.4 - 2010.3

    科学研究費補助金  基盤研究(A)(一般),課題番号:19206020

    梅原 徳次

      More details

    Authorship:Principal investigator 

  12. 高配向カーボンナノチューブ膜の電場印加による高摩擦・耐摩耗機能発現

    2005.4 - 2008.3

    科学研究費補助金  萌芽研究,課題番号:17656060

    梅原 徳次

      More details

    Authorship:Principal investigator 

  13. MEMSのための機能性表面の創成法の開発と評価

    2004.4 - 2007.3

    科学研究費補助金  基盤研究(B),課題番号:16360066

    梅原 徳次

      More details

    Authorship:Principal investigator 

  14. CNx膜の窒素中超低摩擦現象(u<0.001)の解明と超低摩擦スライダーの設計 (環境制御型SEM内その場観察に基づく超低摩擦発現のための最適なじみ過程の解明)

    2001.4 - 2003.3

    科学研究費補助金  基盤(B)

    梅原徳次

      More details

    Authorship:Principal investigator 

  15. マイクロ凝集液滴の接触角を測定することによる表面エネルギー分布評価手法の提案(MEMSトライボロジーのためのマイクロ接触面における表面エネルギー分布の評価)

    2001.4 - 2003.3

    科学研究費補助金  萌芽

    梅原徳次

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    Authorship:Principal investigator 

  16. イオンビームミキシング法による窒化炭素膜に発現する超低摩擦現象の解明(Low friction mechanism map による低摩擦現象の体系的研究)

    1999.4 - 2001.3

    科学研究費補助金  基盤(C)2

    梅原徳次

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    Authorship:Principal investigator 

  17. 磁性流体中の非磁性粒子の3次元配列を利用した磁性流体凍結砥石の研究

    1997.4 - 1999.3

    科学研究費補助金  奨励研究A

    梅原徳次

      More details

    Authorship:Principal investigator 

  18. 磁性流体を用いたハードディスク基板の新テクスチャリング法に関する研究

    1996.4 - 1997.3

    科学研究費補助金  奨励研究A

    梅原徳次

      More details

    Authorship:Principal investigator 

  19. イオンビ−ムミキシング法における摩擦を利用したその場鏡面研磨に関する研究

    1995.4 - 1996.3

    科学研究費補助金  奨励研究A

    梅原徳次

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    Authorship:Principal investigator 

  20. 砥粒の長軸方向及び密度分布を磁場により制御する磁性流体研磨法の基礎研究

    1992.4 - 1993.3

    科学研究費補助金  奨励研究A

    梅原徳次

      More details

    Authorship:Principal investigator 

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Industrial property rights 64

  1. ドリルビット及び孔形成方法

    松山洋介、小柏尊明、梅原徳次、大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2018-158766  Date applied:2019.8

    Country of applicant:Domestic  

  2. ドリルビット及び孔形成方法

    松山洋介, 小柏尊明, 梅原徳次, 大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2018-158766  Date applied:2019.8

  3. 摺動部材およびその製造方法

    眞鍋 和幹、梅原徳次、上坂裕之、市村和之

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    Applicant:トヨタ自動車、名古屋大学

    Application no:特願2016-190212  Date applied:2018.9

    Country of applicant:Domestic  

  4. 摺動部材およびその製造方法

    眞鍋 和幹, 梅原徳次, 上坂裕之, 市村和之

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    Applicant:トヨタ自動車、名古屋大学

    Application no:特願2016-190212  Date applied:2018.9

  5. 切削加工用エントリーシート及び切削加工方法

    梅原徳次、松山洋介、堀江茂

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-168779  Date applied:2018.9

    Country of applicant:Domestic  

  6. 切削加工用エントリーシート及び切削加工方法

    梅原徳次, 松山洋介, 堀江茂

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-168779  Date applied:2018.9

  7. ドリルビット及び孔形成方法

    松山洋介、小柏尊明、梅原徳次、大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2018-157926  Date applied:2018.8

    Country of applicant:Domestic  

  8. ドリルビット及び孔形成方法

    松山洋介, 小柏尊明, 梅原徳次, 大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2018-157926  Date applied:2018.8

  9. 表面形状可変方法

    村島基之、梅原徳次、吉野笙太

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    Applicant:国立大学法人名古屋大学

    Application no:特願2017-104600  Date applied:2018.5

    Country of applicant:Domestic  

  10. 表面形状可変方法

    村島基之, 梅原徳次, 吉野笙太

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    Applicant:国立大学法人名古屋大学

    Application no:特願2017-104600  Date applied:2018.5

  11. ドリルビット及び孔形成方法

    松山洋介、小柏尊明、梅原徳次、大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-558758  Date applied:2018.5

    Country of applicant:Domestic  

  12. ドリルビット及び孔形成方法

    松山洋介、小柏尊明、梅原徳次、大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-558556  Date applied:2018.5

    Country of applicant:Domestic  

  13. ドリルビット及び孔形成方法

    松山洋介, 小柏尊明, 梅原徳次, 大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-558758  Date applied:2018.5

  14. ドリルビット及び孔形成方法

    松山洋介, 小柏尊明, 梅原徳次, 大山慎太郎

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-558556  Date applied:2018.5

  15. 繊維強化複合材又は金属の切削加工用エントリーシート及び該切削加工方法

    梅原徳次、野老山貴之行、松山洋介、堀江 茂、羽崎拓哉

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-80500  Date applied:2018.4

    Country of applicant:Domestic  

  16. 繊維強化複合材又は金属の切削加工用エントリーシート及び該切削加工方法

    梅原徳次, 野老山貴之行, 松山洋介, 堀江 茂, 羽崎拓哉

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2017-80500  Date applied:2018.4

  17. 摺動部品

    上坂裕之、梅原徳次、中谷英太郎

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    Applicant:名古屋大学

    Application no:特願2016-041592  Date applied:2018.3

    Announcement no:特開2017-155896 

    Country of applicant:Domestic  

  18. 摺動部品

    上坂裕之, 梅原徳次, 中谷英太郎

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    Applicant:名古屋大学

    Application no:特願2016-041592  Date applied:2018.3

    Announcement no:特開2017-155896 

  19. 耐摩耗部材およびこれを用いたメカニカルシール

    田中幸雄、梅原徳次、山之内卓弥

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    Application no:特願2016-123373  Date applied:2016.4

    Country of applicant:Domestic  

  20. 摺動部材およびその製造方法

    眞鍋和幹、梅原徳次、上坂裕之、服部貴文

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    Applicant:トヨタ自動車株式会社、名古屋大学

    Application no:特願2015-148058(P2015-148058)   Date applied:2015.7

    Announcement no:特開2017-25396(P2017-25396A) 

    Country of applicant:Domestic  

  21. 金属の切削加工方法

    松山洋介、小柏尊明、梅原徳次、川﨑貴之

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    Applicant:三菱瓦斯化学株式会社

    Application no:特願2015-122165(P2015-122165)  Date applied:2015.6

    Announcement no:特開2017-6996(P2017-6996A) 

    Country of applicant:Domestic  

  22. 摺動部材

    岸 美里、不破良雄、梅原徳次、野老山貴行、上坂裕之、北爪一孝

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    Applicant:トヨタ自動車株式会社、名古屋大学

    Application no:特願2015-26019(P2015-26019)  Date applied:2015.2

    Announcement no:特開2016-148088(P2016-148088A) 

    Country of applicant:Domestic  

  23. 摺動部材および摺動構造

    眞鍋和幹、新吉隆利、不破良雄、梅原徳次、野老山貴行、服部貴文

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    Applicant:トヨタ自動車株式会社、名古屋大学

    Application no:特願2013-215303(P2013-215303)  Date applied:2013.10

    Announcement no:特開2015-78406(P2015-78406A) 

    Country of applicant:Domestic  

  24. 摺動部材

    不破良雄、梅原徳次、野老山貴行、神谷真人、羽田野拓也、上坂裕之

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    Applicant:トヨタ自動車株式会社、名古屋大学

    Application no:特願2013-155677(P2013-155677)   Date applied:2013.7

    Announcement no:特開2013-256716(P2013-256716A) 

    Country of applicant:Domestic  

  25. 摺動部材とその製造方法

    鈴木雅裕、齊藤利幸、梅原徳次、河原真吾、野老山貴行、上坂裕之

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    Applicant:株式会社ジェイテクト、名古屋大学

    Application no:特願2013-56991(P2013-56991)  Date applied:2013.3

    Announcement no:特開2014-181762(P2014-181762A) 

    Country of applicant:Domestic  

  26. 摺動部材とその製造方法

    鈴木雅裕、齊藤利幸、梅原徳次、河原真吾、野老山貴行、上坂裕之

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    Applicant:株式会社ジェイテクト、名古屋大学

    Application no:特願2013-56992(P2013-56992)  Date applied:2013.3

    Announcement no:2014-181291(P2014-181291A) 

    Country of applicant:Domestic  

  27. 摺動部材とその製造方法

    鈴木雅裕、齊藤利幸、梅原徳次、河原真吾、野老山貴行、上坂裕之

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    Applicant:株式会社ジェイテクト、名古屋大学

    Application no:特願2013-56993(P2013-56993)  Date applied:2013.3

    Announcement no:特開2014-181292(P2014-181292A) 

    Country of applicant:Domestic  

  28. 成膜装置および成膜方法

    篠田健太郎、金田英樹、滝和也、梅原徳次、上坂裕之、高岡泰之

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    Applicant:ブラザー工業株式会社、名古屋大学

    Application no:特願2012-16960(P2012-16960)  Date applied:2012.1

    Announcement no:特開2013-155409(P2013-155409A) 

    Country of applicant:Domestic  

  29. 摺道部材,その製造方法及び摺道構造

    不破良雄,梅原徳次,上坂裕之,野老山貴行,榊原啓功

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    Application no:2011-14054  Date applied:2011.1

    Country of applicant:Domestic  

  30. 焼き網

    梅原徳次,野老山貴行,上坂裕之,本田直子,張英俊,加治屋誠

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    Application no:20090904  Date applied:2009.9

    Country of applicant:Domestic  

  31. 摺道部材,その製造方法,及び摺道方法

    不破良雄,梅原徳次,野老山貴行,神谷真人,羽田野拓也

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    Application no:2009-62601  Date applied:2009.3

    Announcement no:2010-215952 

    Country of applicant:Domestic  

  32. 摺道部材及びその製造方法

    不破良雄,梅原徳次,野老山貴行,神谷真人,羽田野拓也,上坂裕之

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    Application no:2009-62384  Date applied:2009.3

    Announcement no:2010-215950 

    Country of applicant:Domestic  

  33. バイアル用ゴム栓

    梅原徳次,上坂裕之,金鐘亨,長谷川満,島田衛

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    Application no:2008-119030  Date applied:2008.4

    Announcement no:2009-269613 

    Country of applicant:Domestic  

  34. 炭素質膜の製造方法および製造装置

    上坂裕之,小泉宏之,濱島絵里,梅原徳次,荒川義博

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    Applicant:国立大学法人名古屋大学,国立大学法人東京大学

    Application no:特願2008-548353  Date applied:2007.12

    Patent/Registration no:5232980  Date registered:2013.4 

    Country of applicant:Domestic  

    備考
    PCT/JP2007/073685
    WO2008/069311

  35. 摺道構造

    不破良雄,梅原徳次,野老山貴行,小河雄一郎

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    Application no:2007-179798  Date applied:2007.7

    Announcement no:2009-13371 

    Country of applicant:Domestic  

  36. 摺道構造

    不破良雄,梅原徳次,野老山貴行,小河雄一郎

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    Application no:2007-179794  Date applied:2007.7

    Country of applicant:Domestic  

  37. 複合硬質炭素膜及びその製造方法並びに摺道部材

    不破良雄,梅原徳次,野老山貴行,王懐鵬

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    Application no:2007-173168  Date applied:2007.6

    Country of applicant:Domestic  

  38. 樹脂製ナット,及び,すべりねじ装置

    石井卓哉,林 工,上坂裕之,平井大輔,梅原徳次

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    Application no:2007-97728  Date applied:2007.4

    Country of applicant:Domestic  

  39. すべりねじ装置用のナット,及び,すべりねじ装置

    石井卓哉,林 工,梅原徳次,上坂裕之,平井大輔,玉置友晴

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    Application no:2007-97675  Date applied:2007.4

    Country of applicant:Domestic  

  40. 樹脂製ナット,及び,すべりねじ装置

    石井卓哉,林 工,梅原徳次,上坂裕之,平井大輔,玉置友晴

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    Application no:2007-97691  Date applied:2007.4

    Country of applicant:Domestic  

  41. 樹脂製ナット,及び,すべりねじ装置

    石井卓哉,林 工,梅原徳次,上坂裕之,平井大輔,玉置友晴

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    Application no:2007-97708  Date applied:2007.4

    Country of applicant:Domestic  

  42. 摺道ユニット及び摺道方法

    不破良雄,梅原徳次

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    Applicant:名古屋大学,トヨタ自動車

    Application no:特許出願2005-261998  Date applied:2005.9

    Announcement no:特許公開2007-70565 

    Country of applicant:Domestic  

  43. SiC/カーボンナノチューブ複合材料およびその利用

    宇佐美初彦,楠美智子,三宅晃司,梅原徳次

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    Applicant:名城大学,日本ファインセラミックスセンター,産総研,名古屋大学

    Application no:特許出願2005-193923  Date applied:2005.7

    Announcement no:特許公開2007-7814 

    Country of applicant:Domestic  

  44. 疎水性高分子基板表面の親水性維持方法

    梅原徳次,赤上陽一,加藤勝,今井潤,吉田博,草場宣延

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    Applicant:名古屋大学,秋田県,岩手大学,ニプロ株式会社

    Application no:特許出願2005-105027  Date applied:2005.3

    Announcement no:特許公開2006-282871 

    Country of applicant:Domestic  

  45. 核酸マイクロアレイおよびその製造方法

    梅原徳次,赤上陽一,加藤勝,今井潤,吉田博,草場宣延

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    Applicant:名古屋大学,秋田県,岩手大学,ニプロ株式会社

    Application no:特許出願2005-105437  Date applied:2005.3

    Announcement no:特許公開2006-284395 

    Country of applicant:Domestic  

  46. 砥石及びその製造方法

    佐藤敦,二上伸太郎,梅原徳次

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    Applicant:ソニー

    Application no:特許出願2004-30360  Date applied:2004.2

    Announcement no:特許公開2005-219169 

    Country of applicant:Domestic  

  47. 磁性砥粒を利用する研磨方法、及び研磨装置

    下村彰,梅原徳次

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    Applicant:日の本研磨材

    Application no:特許出願2003-432964  Date applied:2003.12

    Announcement no:特許公開2005-186239 

    Country of applicant:Domestic  

  48. 電界により砥粒の分布及び配列を制御可能な砥石,その製造方法,表面仕上げ工法

    赤上陽一,梅原徳次

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    Date applied:2003.3

    Patent/Registration no:3686652 

    Country of applicant:Domestic  

  49. 研磨材、その製造方法及びそれを使用した研磨工具の製造方法

    川島徳道,萩原新作,梅原徳次,柴田勲,文柄俊

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    Applicant:桐蔭学園,萩原新作,梅原徳次,プラムス有限会社

    Application no:特許出願2002-236138  Date applied:2002.8

    Announcement no:特許公開2004-74332 

    Country of applicant:Domestic  

  50. DNAチップ用基板、DNAチップ、及びそれらの製造方法、並びに解析システム

    岩渕明,赤上陽一,梅原徳次,松村隆,吉野雅彦,小西智一

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    Applicant:秋田県

    Application no:特許出願2002-133818  Date applied:2002.5

    Announcement no:特許公開2003-329679 

    Country of applicant:Domestic  

  51. 自力真空水洗トイレ

    平野 芳久,小原 弘道, 梅原徳次,田代伸一,小西 奎二,登阪 繁行,本田 智

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    Applicant:弘久写真工業株式会社

    Application no:特許出願2001-403115  Date applied:2001.12

    Announcement no:特許公開2002-320650 

    Country of applicant:Domestic  

  52. 磁場配列を利用した研削用砥粒体の再生方法及び再生装置

    梅原徳次,枝村一弥,芝田勲

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    Applicant:梅原徳次,新技術マネイジメント,ニスカ

    Application no:特許出願2001-298187  Date applied:2001.9

    Announcement no:特許公開2003-103465 

    Country of applicant:Domestic  

  53. 研磨装置

    梅原徳次,萩原新作,芝田勲,文柄俊

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    Applicant:梅原徳次,萩原新作,芝田勲

    Application no:特許出願2001-281072  Date applied:2001.9

    Announcement no:特許公開2003-89052 

    Country of applicant:Domestic  

  54. 摺動装置

    梅原徳次,加藤康司

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    Applicant:オイレス工業株式会社, 梅原徳次

    Application no:特許出願2001-256094  Date applied:2001.8

    Announcement no:特許公開2002-339056 

    Country of applicant:Domestic  

  55. 砥石の製造方法、砥石、及び研磨方法

    梅原徳次,萩原新作,芝田勲

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    Applicant:梅原徳次,萩原新作,芝田勲

    Application no:特許出願2001-195010  Date applied:2001.6

    Announcement no:特許公開2003-11064 

    Country of applicant:Domestic  

  56. 研削用砥粒体

    梅原徳次,枝村一弥,芝田勲

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    Applicant:ニスか株式会社,新技術マネイジメント,梅原徳次

    Application no:特許出願平11-164369  Date applied:1999.6

    Announcement no:特許公開2000-351960 

    Country of applicant:Domestic  

  57. 研磨材、研磨材の製造方法及び研磨若しくは研削方法

    梅原徳次,芝田勲

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    Applicant:ニスか株式会社,梅原徳次

    Application no:特許出願平9-334243  Date applied:1997.12

    Announcement no:特許公開平11-165252 

    Country of applicant:Domestic  

  58. 研磨装置

    梅原徳次,芝田勲

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    Applicant:ニスか株式会社,梅原徳次

    Application no:特許出願平9-334242  Date applied:1997.12

    Announcement no:特許公開平11-165268 

    Country of applicant:Domestic  

  59. 中心に穴を有する浮子と砥粒を含む磁性流体の循環装 置のある球体の研磨方法及びその装置

    西山博,梅原徳次

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    Applicant:西山博

    Application no:特許出願平7-94552  Date applied:1995.3

    Announcement no:特許公開平8-257897 

    Country of applicant:Domestic  

  60. 磁性流体を用いた帯状物の研磨装置

    加藤康司,梅原徳次,安藤克巳

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    Applicant:新日本製鐵株式会社

    Application no:特許出願平5-69507  Date applied:1993.3

    Announcement no:特許公開平6-278012 

    Country of applicant:Domestic  

  61. 磁性流体を用いる球体の研磨方法及び研磨装置

    加藤康司,梅原徳次

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    Date applied:1991

    Patent/Registration no:1835317  Date registered:1993 

    Country of applicant:Domestic  

  62. 磁性流体を用いる研磨方法

    Mizuguchi,S., S.Ueda, Kato, K. and N.Umehara

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    Date applied:1991

    Patent/Registration no:5076026  Date registered:1991.12 

    Country of applicant:Foreign country  

  63. Microscopic Grinding Method and Microscopic Grinding Device

    加藤康司,梅原徳次

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    Date applied:1991

    Patent/Registration no:1831357  Date registered:1993 

    Country of applicant:Domestic  

  64. Method for Grinding Using a Magnetic Fluid an Apparatus Thereof

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    Date applied:1988

    Patent/Registration no:4821466  Date registered:1988.4 

    Country of applicant:Foreign country  

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Teaching Experience (On-campus) 6

  1. Foundations of Electromagnetics II

    2020

  2. Material Processing

    2020

  3. Manufacturing Processes 1 with Exercises

    2020

  4. Advanced Lectures on Manufacturing Processes Engineering

    2020

  5. Foundations of Electromagnetics II

    2011

  6. 機能性表面工学特論

    2010

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Teaching Experience (Off-campus) 2

  1. 機能表面工学

    2023.8 Hiroshima University)

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    Level:Postgraduate  Country:Japan

  2. マイクロマシン工学

    2008.4 - 2009.3 岐阜大学)