Faculty Profiles - TOKOROYAMA, Takayuki

Papers - TOKOROYAMA, Takayuki

Division display >> ／ All the affair displays 1 - 287 of about 287

Corrosion and tribological properties of ta-C/ta-C: Ta coatings: Analysis of the influence of Ta-O/Ta-C ratio Reviewed

Li, LL; Tokoroyama, T; Zhang, RX; Umehara, N

TRIBOLOGY INTERNATIONAL Vol. 198 2024.10

Effect of the graphite domain direction on the friction coefficient of tetrahedral amorphous carbon nitride Reviewed

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

DIAMOND AND RELATED MATERIALS Vol. 143 2024.3

The 1 μm wear particles entrainment in situ observation via fluorescent staining silica particles by silane coupling with Rhodamine B Reviewed

Tokoroyama, T; Okashita, M; Fusetani, N; Murashima, M; Hashizume, N; Tsuboi, R; Shiomi, H; Umehara, N

FRONTIERS IN MECHANICAL ENGINEERING-SWITZERLAND Vol. 10 2024.2

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

Tanaka, K; Tokoroyama, T; Umehara, N; Murashima, M; Oshio, T; Yagishita, K

TRIBOLOGY LETTERS Vol. 71 ( 2 ) 2023.6

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

Kim, JI; Lee, WY; Tokoroyama, T; Umehara, N

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

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

Kim, JI; Lee, WY; Tokoroyama, T; Umehara, N

CARBON Vol. 204 page： 268 - 283 2023.2

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

Tokoroyama, T; Tanaka, K; Kani, T; Murashima, M; Lee, WY; Umehara, N; Oshio, T; Yagishita, K

TRIBOLOGY LETTERS Vol. 70 ( 4 ) 2022.12

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

Tokoroyama, T; Tagami, Y; Murashima, M; Lee, WY; Umehara, N; Kousaka, H

TRIBOLOGY INTERNATIONAL Vol. 168 2022.4

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

Kassim, KAM; Tokoroyama, T; Murashima, M; Lee, WY; Umehara, N; Mustafa, MMB

TRIBOLOGY INTERNATIONAL Vol. 159 2021.7

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

Tokoroyama, T; Nishimoto, T; Murakami, Y; Honda, A; Mitsui, H; Terai, Y; Murashima, M; Lee, WY; Umehara, N

TRIBOLOGY ONLINE Vol. 16 ( 4 ) page： 255 - 262 2021

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

Kani, T; Tokoroyama, T; Umehara, N; Murashima, M; Lee, WY; Yagishita, K

TRIBOLOGY ONLINE Vol. 16 ( 4 ) page： 263 - 270 2021

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

Kassim, KAM; Tokoroyama, T; Murashima, M; Umehara, N

TRIBOLOGY INTERNATIONAL Vol. 147 2020.7

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

Lee, WY; Jang, YJ; Tokoroyama, T; Murashima, M; Umehara, N

DIAMOND AND RELATED MATERIALS Vol. 105 2020.5

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

Tokoroyama, T; Murashima, M; Umehara, N

TRIBOLOGY ONLINE Vol. 15 ( 5 ) page： 300 - 308 2020

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 Reviewed

岡本竜也，梅原徳次，野老山貴行，村島基之

日本機械学会論文集 Vol. 85 ( 875 ) page： transjsme.19-00071 2019.7

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

T. Tokoroyama, T. Kamiya, N.A.B.H. Ahmed, N. Umehara

JSME Mechanical Engineering Letters Vol. 4 page： 18-00089 2018.12

境界潤滑条件における模擬摩耗粒子の摩擦面その場観察 Reviewed

千葉翔悟，伊神汰一，野老山貴行

材料試験技術協会論文集 Vol. 63 ( 1 ) page： 17-21 2018.1

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 Reviewed

野老山貴行，大須賀未都，梅原徳次，上坂裕之

日本機械学会論文集 Vol. 83 ( 845 ) page： 16-00123 2017.1

往復式及び回転式シェーバーによる人工毛切断挙動観察 Reviewed

野老山貴行，中西直哉，梅原徳次

日本機械学会論文集 Vol. 82 ( 844 ) page： 16-00187 2016.12

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 2016.11

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

Influence of UV irradiation for low frictional performance of CNx coatings Reviewed International coauthorship

T. Tokoroyama, M. Kamiya, N. UMEHARA, C. Wang, D.F. Diao

Lubrication Science Vol. 24 ( 3 ) page： 129- - 139 2012.4

Development of a Radio Knife Suppressing the Adhesion of Coagulated Blood Reviewed

Yuya Nakashima, Noritsugu Umehara, Takayuki Tokoroyama and Yoichi Akagami

Vol. 78 ( 786 ) page： 605-614 2012.2

The influence of interlayer for frictional property and adhesion of IBAD CNx coating Reviewed

M. Wakayama, Y. Tsukiyama, T. Tokoroyama, H. Kousaka, N. Umehara, M. Wang and T. Toihara

Vol. 77 ( 781 ) page： 3502- - 3510 2011.10

Reduction of adhesion of coagulation to a radio knife tip with filled micro-grooves Reviewed

Yuya NAKASHIMA, Noritsugu UMEHARA, Takayuki TOKOROYAMA and Yoichi AKAGAMI

Vol. 77 ( 779 ) page： 2916 - 2921 2011.7

The Effect of Ultraviolet Irradiation on Friction Coefficient of Diamond-Like Carbon Coating in Air Reviewed

Takayuki TOKOROYAMA*, Takuya HATANO, Noritsugu UMEHARA, and Yoshio FUWA

Journal of Japanese Society of Tribologists Vol. 56 ( 4 ) page： 256 - 263 2011.4

The Effect of Substrate Temperature, Nitrogen Ionbeam Acceleration Voltage, and Deposition Rate on Hardness of Carbon Nitride Coating Reviewed

T. TOKOROYAMA, R. SAITO, N. UMEHARA and Y. FUWA

Vol. 77 ( 775 ) page： 624 - 630 2011.3

窒素中で超低摩擦を発現するCNx膜の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） Vol. 76 ( 772 ) page： 3794 - 3799 2010.12

The Effect of Ultraviolet Irradiation on Friction Coefficient of Diamond-Like Carbon Coating in Air Reviewed

T. Tokoroyama, T. Hatano, N. Umehara, Y. Fuwa

Vol. 76 ( 771 ) page： 3166 - 3171 2010.11

窒化炭素膜のトライボロジー特性に及ぼす紫外線照射の影響 Reviewed

野老山貴行，梅原徳次，神谷真人，不破良雄

トライボロジスト Vol. 55 ( 9 ) page： 659 - 665 2010.9

The influence of micro-grooves for friction dependant on sliding velocity in slide bearing under oil lubrication Reviewed

Shotaro OZU, Takayuki TOKOROYAMA, Atsushi KORENAGA, Shinya SASAKI and Noritsugu UMEHARA

Transactions of the Japan Society of Mechanical Engineers, Series C Vol. 75 ( 754 ) page： 1866 - 1871 2009.6

Influence of the Carbon-Overcoat on CNx Coating for the Friction and Wear Properties Reviewed

Huaipeng WANG, Takayuki TOKOROYAMA, Noritsugu UMEHARA, and Yoshio FUWA

Transactions of the Japan Society of Mechanical Engineers, Series C Vol. 75 ( 754 ) page： 1859 - 1865 2009.6

Superlow Friction Phenomena of Carbon Nitride Coatings Lubricated under 18 Carbon Atoms Unsaturated Fatty Acids Reviewed

Takayuki Tokoroyama, Noritsugu Umehara, Yuichiro Ogawa, Yoshio Fuwa

Journal of Japanese Society of Tribologists Vol. 54 ( 6 ) page： 406 - 411 2009.6

Superlow friction with CNx coating under oil lubrication Reviewed

Yuichiro Ogawa, Takayuki Tokoroyama, Noritsugu Umehara, Yoshio Fuwa

Transactions of the Japan Society of Mechanical Engineers, Series C Vol. 75 ( 752 ) page： 1088 - 1093 2009.4

Control of friction and wear properties of CNx coatings with rising temperature in ambient air Reviewed

Yuya Yoshikawa, Takayuki Tokoroyama, Noritsugu Umehara

Transactions of the Japan Society of Mechanical Engineers, Series C Vol. 74 ( 747 ) page： 2791 - 2796 2008.11

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

Shingo Kanda, Takayuki Tokoroyama, Noritsugu Umehara, Yoshio Fuwa

Tribology Online Vol. 3 ( 2 ) page： 100 - 104 2008.4

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

Carbon Nitride (CNx) coating was reported to show a superlow friction coefficient when it slid against a Si3N4 ball in nitrogen gas at atmospheric pressure. This superlow friction phenomenon occurred after a number of sliding cycles, in the so-called running-in period, due to the nitrogen atom desorption from the topmost CNx coating surface; its the surface became a graphite-like layer, and a transfer layer was formed on the counter material surface. However, a friction test and surface analysis should be conducted simultaneously, when detailed frictional phenomena including functional groups are observed on the topmost CNx surface. It was supposed that several functional groups were adsorbed on the topmost surface of the carbon system coating when the specimen was withdrawn from the synthesis chamber. In this study, we constructed a friction test apparatus in a FTIR analytic chamber to conduct friction tests and surface analysis without taking the friction test chamber out of the analytical chamber. The analysis results of 1500 cycles each indicated that the -OH or -NH functional group gradually increased with the number of sliding cycles. However, the group decreased suddenly as the friction coefficient decreased. Finally, these kinds of functional groups were not detected when the CNx coating showed superlow friction phenomena.

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 Vol. 1 ( 5 ) page： 661 - 668 2007.11

Effect of Nitrogen atoms desorption on the friction of the CNx coating against Si3N4 ball in Nitrogen gas Reviewed

Takayuki Tokoroyama, Minoru Goto, Noritsugu Umehara, Takashi Nakamura, Fumihiro Honda

Tribology Letters Vol. 22 ( 3 ) page： 215 - 220 2006.6

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

Phase transition of CNx coatings by sliding against a Si3N4 ball has been studied by Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) to understand this super-low friction phenomena in N2. A pin-on-disk type tribometer was constructed to determine the tribological properties of this coating when sliding against a Si3N4 ball in N2. The analytical results by AES and XPS showed that the nitrogen atoms desorbed from the top layers of the coating, and that the layers changed to a graphite-like structure without nitrogen during a friction coefficient decrease to lower than 0.01. The structural transition of CNx is discussed in this paper.

The effect of environmental gas on friction coefficient of CNx coatings and maximum concentration of O2 for the realization of ultra-low friction Reviewed

Takayuki Tokoroyama, Takashi Nakamura, Noritsugu Umehara, Hirotsugu Tomita, Yukinori Takenoshita

Journal of Japanese Society of Tribologists Vol. 50 ( 9 ) page： 683 - 689 2005.9

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

It was reported that CNx showed super-low friction coefficient less than 0.01 in N2. In this study, to clarify the possibility of super-low friction of CNx in air, friction tests in N2, O2, CO2, and Ar were carried out. Moreover, friction tests in each constant concentration of O2 and increasing concentration of O2 from 0 to 21% or decreasing from 21 to 0% were carried out to know the maximum concentration of O2 in ambient gas. Main results are the followings: (1) In the case of friction test carried out in O2, the transfer layer showed 7 times higher oxygen concentration than the transfer layer formed in N2. On the other hand, in the case of transfer layer indicating low concentration of oxygen, friction coefficient was lower than 0.05. (2) In order to obtain super-low friction coefficient less than 0.01, it was necessary that at least transfer layer should be formed in N2 (contained concentration of O2 lower than 0.01%) and the concentration of O2 at friction environment kept less than 2.0%.

Effect of surface roughness and transfer layer of mating ceramic parts for ultra low friction phenomena in sliding between CNx and ceramics Reviewed

Takayuki Tokoroyama, Noritsugu Umehara, Hirotsugu Tomita, Yukinori Takenoshita

Transactions of the Japan Society of Mechanical Engineers, Series C Vol. 69 ( 686 ) page： 2824 - 2829 2003.10

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

In order to know the running-in process for ultra low friction of CNx sliding against Si3N4 balls in N2, the effect of surface roughness of balls on friction coefficient was investigated. As results, it was shown that friction coefficient for all of Si3N4 balls decreased with sliding cycles and reached to the specific minimum values less than 0.05. For friction coefficient less than 0.01, smooth surface of ball with 30nm Ry as initial surface roughness was necessary. Smooth surfaces of CNx coating and Si3N4 ball after running-in provide ultra low friction after the transfer of tiny amount of CNx to Si3N4 ball and the generating of thin and uniform transfer film on balls.

Design of low-friction PVD coating systems with enganced running-in performance - carbon overcoats on TaC/aC Reviewed International coauthorship

H. Nyberg, T. Tokoroyama, U. Wiklund, S. Jacobson

Surface and Coatings Technology Vol. 222 page： 48 - 54 2013.3

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

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

TRIBOLOGY LETTERS Vol. 72 ( 1 ) 2024.3

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

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

SURFACES AND INTERFACES Vol. 44 2024.1

Creation of anti-frost micro-plastic texture surfaces enhancing thermal conductivity by carbon black containing in polyvinyl chloride Reviewed

Tokoroyama, T; Zhang, LY; Wu, WJ; Murashima, M; Umehara, N

JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING Vol. 18 ( 3 ) 2024

Influence of Defects in Graphene-Like Network of Diamond-Like Carbon on Silica Scale Adhesion Reviewed

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

TRIBOLOGY LETTERS Vol. 71 ( 1 ) 2023.2

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

Murashima, M; Yamada, T; Umehara, N; Tokoroyama, T; Lee, WY

TRIBOLOGY INTERNATIONAL Vol. 180 2023.2

Carbon-based coatings for suppression of silica adhesion in geothermal power generation Reviewed International coauthorship

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

TRIBOLOGY INTERNATIONAL Vol. 177 2023.1

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

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

TRIBOLOGY INTERNATIONAL Vol. 177 2023.1

樹脂パッドと電界砥粒制御技術を適用した先進結晶基板への低ダメージ機械研磨技術 Reviewed

千葉翔悟，久住孝幸，赤上陽一，野老山貴行，村岡幹夫

砥粒加工学会誌 Vol. 64 ( 1 ) page： 32-38 2020.1

Investigating running-in behavior to understand wear behavior of ta-C coating with filtered cathodic vacuum arc deposition Reviewed

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

JURNAL TRIBOLOGI Vol. 23 page： 38 - 47 2019.12

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

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

TRIBOLOGY ONLINE Vol. 13 ( 5 ) page： 241-247 2018.10

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

CNx膜のイオンビームミキシング成膜におけるドロップレットの生成抑制手法の提案 Reviewed

八木雄治，榊原和希，野老山貴行，梅原徳次，不破良雄，眞鍋和幹

日本機械学会論文集（C編） Vol. 79 ( 807 ) page： 4443-4451 2013.11

In-situ Observation for Tribomicroplasma and Transfer Layer Forming of Carbon Nitride Coating Reviewed

Y. Miyahira, T. Tokoroyama, N. Umehara and Y. Fuwa

Journal of Japanese Society of Tribologists Vol. 56 ( 6 ) page： 378 - 384 2011.6

Development of precipitation lubrication with palmitic acid and its friction mechanism Reviewed International coauthorship

Hashizume, N; Takano, R; Umehara, N; Tokoroyama, T; Zhang, RX; Hanyuda, K; Otsuka, A; Ueda, M

TRIBOLOGY INTERNATIONAL Vol. 200 2024.12

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

Bin Mustafa, MM; Umehara, N; Tokoroyama, T; Murashima, M; Shibata, A; Utsumi, Y; Moriguchi, H

TRIBOLOGY INTERNATIONAL Vol. 147 2020.7

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

X. Liu, N. Umehara, T. Tokoroyama, M. Murashima

Tribology International Vol. 131 page： 102-111 2019.3

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

Zin, MRB; Yagi, Y; Sasaki, K; Inayoshi, N; Tokoroyama, T; Umehara, N; Kousaka, H; Kawara, S

TRIBOLOGY INTERNATIONAL Vol. 109 page： 48 - 57 2017.5

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

M.R.B. Mohamad Zin, Y. Yagi, K. Sasaki, N. Inayoshi, T. Tokoroyama, N. Umehara, H. Kousaka, S. Kawara

Tribology International Vol. 109 page： 48-57 2017.3

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 ( B ) page： 660-665 2016.1

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

H.A. Tasdemir, M. Wakayama, T. Tokoroyama, H. Kousaka, N. Umehara, Y. Mabuchi and T. Higuchi

Tribology International Vol. 77 page： 65-71 2014.9

Influence of zinc dialkyldithiophosphate tribofilm formation on the tribological performance of self-mated diamond-like carbon contacts under boundary lubrication Reviewed

H.A. Tasdemir, T. Tokoroyama, H. Kousaka, N. Umehara and Y. Mabuchi

Thin Solid Films Vol. 562 ( 1 ) page： 389-397 2014.1

Wear behaviour of tetrahedral amorphous diamond-like carbon in additive containing lubricants Reviewed

H. Tasdemir, M. Wakayama, T. Tokoroyama, H. Kousaka, N. Umehara, Y. Mabuchi, T. Higuchi

Wear Vol. 307 ( 1-2 ) page： 1 - 9 2013.9

Thermal stability and high-temperature tribological properties of a-C:H and Si-DLC deposited by microwave sheath voltage combinatio plasma Reviewed

X. Deng, H. Kousaka, T. Tokoroyama, N. Umehara

Tribology Online Vol. 8 ( 4 ) page： 257 - 264 2013.9

Evaluation of transformed layers of DLC after sliding in oil with spectroscopic reflectometry Reviewed

K. Ohara, N.A.B Masripan, H. Kousaka, T. Tokoroyama, N. Umehara, S. Inayoshi, K. Zushi, M. Fujita

Tribology International Vol. 65 page： 270 - 277 2013.9

Ultra-low friction of diamond-like carbon (DLC) under oil boundary lubrication Reviewed

H. Tasdemir, M. Wakayama, T. Tokoroyama, H. Kousaka, N. Umehara, Y. Mabuchi, T. Higuchi

Tribology International Vol. 65 page： 286 - 294 2013.9

加熱冷却過程におけるDLC膜のはく離メカニズムの解明 Reviewed

三宮大輝，上坂裕之，梅原徳次，野老山貴行

日本機械学会論文集（C編） Vol. 79 ( 799 ) page： 858 - 865 2013.3

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

N.A.B. Masripan, K. Ohara, N. Umehara, H. Kousaka, T. Tokoroyama, S. Inami, K. Zushi, M. Fujita

Tribology International Vol. 65 page： 265 - 269 2013

Phase Transformation Studies on a-C Coating under Repetitive Impacts Reviewed

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

Surface and Coatings Technology Vol. 205 ( 2 ) page： 625 - 631 2010.10

Effect of Water on Wear of DLC Coatings in High Temperature and Pressurized Ethanol Reviewed

Tokoroyama, T; Horikawa, S; Mimata, J; Umehara, N; Murashima, M

TRIBOLOGY LETTERS Vol. 72 ( 4 ) 2024.12

Clarification of the effects of adsorption films of ester-blended oil on friction by in situ reflectance spectroscopy Reviewed

Hirata, K; Murashima, M; Umehara, N; Tokoroyama, T; Hashizume, N; Lee, WY; Takekawa, D; Narita, K

TRIBOLOGY INTERNATIONAL Vol. 187 2023.9

Friction characteristics of amorphous carbon coating against various 3d-transition metals Reviewed

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

TRIBOLOGY INTERNATIONAL Vol. 174 2022.10

New in situ superlow-friction method for nitrogen-containing diamond-like carbon coatings using dielectric barrier discharge treatment in ambient air Reviewed

Wu, WJ; Murashima, M; Saso, T; Tokoroyama, T; Lee, WY; Kousaka, H; Umehara, N

TRIBOLOGY INTERNATIONAL Vol. 174 2022.10

Effect of fracture properties and surface morphology on wear of DLC coatings at severe contact condition Reviewed

Yamada, Y; Murashima, M; Umehara, N; Tokoroyama, T; Lee, WY; Takamatsu, H; Tanaka, Y; Utsumi, Y

TRIBOLOGY INTERNATIONAL Vol. 169 2022.5

Realization of near-less friction of ta-CNx coating under R32 refrigerant environment Reviewed

Lee, W; Murashima, M; Umehara, N; Tokoroyama, T; Horaguchi, N; Ishimoto, T

TRIBOLOGY INTERNATIONAL Vol. 168 2022.4

New in situ low-friction technology for diamond-like carbon coatings using surface discharge treatment in ambient air Reviewed

Murashima, M; Oyama, S; Kousaka, H; Tokoroyama, T; Lee, WY; Umehara, N

TRIBOLOGY INTERNATIONAL Vol. 165 2022.1

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

Hashizume, N; Murashima, M; Umehara, N; Tokoroyama, T; Lee, WY

TRIBOLOGY INTERNATIONAL Vol. 162 2021.10

Realization of a Novel Morphing Surface Using Additive Manufacturing and Its Active Control in Friction Reviewed

Murashima, M; Imaizumi, Y; Kawaguchi, M; Umehara, N; Tokoroyama, T; Saito, T; Takeshima, M; Tsukiyama, Y; Nitta, I

JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME Vol. 143 ( 5 ) 2021.5

Active friction control in lubrication condition using novel metal morphing surface Reviewed

Murashima, M; Imaizumi, Y; Murase, R; Umehara, N; Tokoroyama, T; Saito, T; Takeshima, M

TRIBOLOGY INTERNATIONAL Vol. 156 2021.4

Nanotextured Mold Surface with DLC Coating for Reduction in Residual Ceramic Particles Reviewed

Murashima, M; Hojo, K; Ito, S; Umehara, N; Tokoroyama, T; Takahashi, T; Imaeda, M

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

Development of Surface Roughness Generation Model for CFRTP Manufactured by LFT-D Reviewed

Murashima, M; Murooka, T; Umehara, N; Tokoroyama, T

INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY Vol. 14 ( 2 ) page： 208 - 216 2020.3

New Droplet Removal Polishing Method for Diamond-Like Carbon with Carbon Fiber Brush Reviewed

Murashima, M; Imaizumi, Y; Umehara, N; Tokoroyama, T

INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY Vol. 14 ( 2 ) page： 190 - 199 2020.3

Effect of mating material and graphitization on wear of a-C:H coating in boundary base oil lubrication Reviewed

K.A.M. Aboua, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, M.M.B. Mustafa, Y. Mabuchi, T. Higuchi, M. Kawaguchi

Tribology Letters Vol. 68 2020.1

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

Aboua, KAM; Umehara, N; Kousaka, H; Tokoroyama, T; Murashima, M; Bin Mustafa, MM; Mabuchi, Y; Higuchi, T; Kawaguchi, M

TRIBOLOGY LETTERS Vol. 68 ( 1 ) 2020.1

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

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

TRIBOLOGY LETTERS Vol. 67 ( 2 ) page： 65 2019.6

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

Liu, XX; Umehara, N; Tokoroyama, T; Murashima, M

TRIBOLOGY INTERNATIONAL Vol. 131 page： 102 - 111 2019.3

Effect of mesh structure of tetrahedral amorphous carbon ta-C coating on friction and wear properties under base-oil lubrication condition Reviewed

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

Tribology International 2019.1

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

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

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

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

TRIBOLOGY ONLINE Vol. 13 ( 5 ) page： 290-300 2018.12

FCVA法によるホウ素含有炭素ターゲットを用いたta-C:B膜の成膜及び300℃までのトライボロジー特性 Reviewed

根本公紀，梅原徳次，野老山貴行，村島基之，瀧本裕治，中道健司

トライボロジスト Vol. 60 ( 10 ) page： 699-705 2018.10

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

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

JURNAL TRIBOLOGI Vol. 18 page： 1-19 2018.9

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

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

TRIBOLOGY ONLINE Vol. 13 ( 3 ) page： 119-130 2018.7

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

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 ) 2018

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

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

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

固体潤滑シートによるチタン合金板の穴あけ加工におけるバリ発生の抑制 Reviewed

川崎貴之，梅原徳次，上坂裕之，野老山貴行，堀江茂，松山洋介

日本機械学会論文集 Vol. 81 ( 831 ) page： 15-00247 2015.10

熱可塑性樹脂の金属に対する付着に及ぼす金属表面温度の影響 Reviewed

村島基之，梅原徳次，上坂裕之，野老山貴行

日本機械学会論文集 Vol. 81 ( 822 ) page： 14-00098 2015.2

プラズマCVD法により作製したSi-CNxHy膜の油中摩擦特性 Reviewed

北爪一考，上坂裕之，野老山貴行，梅原徳次，不破良雄，眞鍋和幹

日本機械学会論文集 Vol. 80 ( 820 ) page： trans0340 2014.12

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

X. Deng, H. Kousaka, T. Tokoroyama and N. Umehara

Surface and Coatings Technology Vol. 259 page： 2-6 2014.12

Effect of tetramethylsilane flow on the deposition and tribological behaviors of silicon doped diamond-like carbon rubbed against poly(oxymethylene) Reviewed

X. Deng, Y. Lim, H. Kousaka, T. Tokoroyama and N. Umehara

Japanese Journal of Applied Physics Vol. 53 ( 11 ) page： RA04 2014.9

PTFEの親水化とブラシ化処理の水潤滑下耐焼付き性に及ぼす影響 Reviewed

河原真吾，梅原徳次，野老山貴行，鈴木雅裕，齋藤利幸，新井大輔

日本機械学会論文集 Vol. 80 ( 816 ) page： MN0243 2014.8

高摩擦・低相手攻撃性アブレシブ形状及びディスク材の提案（アブレシブ摩耗における摩耗度に及ぼすアブレシブの開き角及びディスク材の単位体積当たりの破断エネルギの影響） Reviewed

炭竈美穂，野老山貴行，上坂裕之，梅原徳次

日本機械学会論文集 Vol. 80 ( 815 ) page： SMM0182 2014.7

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 2014.7

高摩擦・低相手攻撃性アブレシブ形状の提案（アブレシブ摩耗における摩擦係数と相手材の摩耗度に及ぼすアブレシブの開き角の影響） Reviewed

炭竈美穂，梅原徳次，野老山貴行，上坂裕之

日本機械学会論文集 Vol. 80 ( 811 ) page： SMM0038 2014.3

カーボンファイバーの摩擦特性に及ぼすプラズマ照射の影響 Reviewed

三宮大輝，梅原徳次，野老山貴行，上坂裕之

日本機械学会論文集（C編） Vol. 79 ( 801 ) page： 1827 - 1836 2013.3

Effect of transfer layer on ultra low friction of CNx coating under blowing dry Ar Reviewed

N.A.B. Masripan, Y. Miyahira, H. Nishimura, T. Tokoroyama, N. Umehara, Y. Fuwa

Tribology Online Vol. 8 ( 3 ) page： 219-226 2013.3

カーボンナノチューブの押込みにおけるヒステリシス発生メカニズムの解明 Reviewed

若山幹晴，月山陽介，野老山貴行，上坂裕之，梅原徳次

日本機械学会論文集（C編） Vol. 79 ( 801 ) page： 1821-1826 2013.3

シリコーンオイルフリー注射器実現のための光化学的フッ素化処理ガスケットの最適化 Reviewed

小椋東吾，宇佐美恵佑，上坂裕之，梅原徳次，野老山貴行

日本機械学会論文集（C編） Vol. 79 ( 803 ) page： 2506 - 2516 2013

Future developments of a deformation-wear transition map of DLC coating Reviewed

M.F.B. Abdollah, Y. Yamaguchi, T. Akao, N. Miyamoto, T. Tokoroyama and N. Umehara

Tribology Online Vol. 7 ( 3 ) page： 107 - 111 2012.6

Deformation-wear transition map of DLC coating under cyclic impact loading Reviewed

M.F.B. Abdollah, Y. Yamaguchi, T. Akao, N. Inayoshi, N. Miyamoto, T. Tokoroyama and N. Umehara

Wear Vol. 274-275 ( 27 ) page： 435 - 441 2012.2

The effect of maximum normal impact load, absorbed energy and contact impulse on the impact crater volume/depth of DLC coating under impact Reviewed

M.F.B. Abdollah, Y. Yamaguchi, T. Akao, N. Inayoshi, T. Tokoroyama, N. Umehara

Tribology Online Vol. 6 ( 6 ) page： 257 - 264 2011.8

Friction reduction between thermoplastic elastomers and plastics under unlubricated condition Reviewed

Keisuke USAMI, Hiroyuki KOUSAKA, Noritsugu UMEHARA, Takayuki TOKOROYAMA

Vol. 76 ( 767 ) page： 1833 - 1837 2010.7

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

N. Umehara, Y. Demizu, J. Nishio, T. Tokoroyama

Key Engineering Materials Vol. 447-448 page： 676 - 680 2010.7

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

Noritsugu Umehara, Yasuhito Demizu, Junichi Nishio, Takayuki Tokoroyama

Key Engineering Materials Vol. 447-448 ( 676 ) page： 676 - 680 2010.4

Reduction of adhesion between steel and frilled fish protein with ultra-hydrophobic DLC Reviewed

N. Honda, M. Kajiya, Y.-J. Jang, H. Kousaka, N. Umehara, T. Tokoroyama

Journal of Advanced Mechanical Design, Systems, and Manufacturing Vol. 4 ( 1 ) page： 356 - 364 2010.1

The evaluation of fracture energy at the interfac between grilled fish protein and metal Reviewed

N. Honda, N. Umehara, T. Tokoroyama, R. Ohashi, A. Hanafusa

Tribology Online Vol. 5 ( 1 ) page： 46 - 51 2010.1

Tribological properties of DLC films prepared from different raw materials Reviewed

Masahiro Suzuki, Seiichiro Hironaka, Hideyuki Toyoshima, Takayuki Tokoroyama, Akihiro Tanaka

Journal of the Surface Science Society of Japan Vol. 25 ( 4 ) page： 232 - 237 2004.4

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

The diamond-like carbon (DLC) films were prepared from methane, benzene and toluene by thermal electron exited plasma CVD method. Micro-laser Raman analysis of three films showed a typical spectrum of DLC film. The hardness and hydrogen content of the film were 11-25 GPa and 23-29 at %, respectively. The tribological properties of three DLC films were investigated using a scratch tester, a Bowden-Leben type friction tester and a ball-on-disk type reciprocationg friction tester. The effects of raw materials on the tribological properties were confirmed. The difference in tribological properties of these three films seems to be related with their hardness. That is, the friction coefficient of the DLC film with low hardness was lower than that of the film with high hardness. On the other hand, when the hardness was increased, the specific wear rate of the DLC films appeared to decrease. The transferred films formed on mating material surfaces are supposed to play significant roles in the tribological properties of the DLC films.

The development of B/Cr co-doped DLC coating by FCVA deposition system and its tribological properties at 300 °C Reviewed

Zhang, RX; Lee, WY; Umehara, N; Tokoroyama, T; Murashima, M; Takimoto, Y

SURFACE & COATINGS TECHNOLOGY Vol. 487 2024.7

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

Murashima, M; Aono, K; Umehara, N; Tokoroyama, T; Lee, WY

TRIBOLOGY ONLINE Vol. 18 ( 6 ) page： 292 - 301 2023

Tribocatalytic Reaction Enabled by TiO2 Nanoparticle for MoDTC-Derived Tribofilm Formation at ta-C/Steel Contact Reviewed International coauthorship

Matsukawa, D; Park, JH; Lee, WY; Tokoroyama, T; Kim, JI; Ichino, R; Umehara, N

COATINGS Vol. 14 ( 6 ) 2024.6

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

Mustafa, MMB; Umehara, N; Tokoroyama, T; Murashima, M; Utsumi, Y; Moriguchi, H; Shibata, A

TRIBOLOGY INTERNATIONAL Vol. 193 2024.5

The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication Reviewed

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

TRIBOLOGY LETTERS Vol. 72 ( 1 ) 2024.3

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

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

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

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

Low friction of nitrogen-doped diamond-like carbon coating due to acidic liquid film and nitrogen-doped graphite oxide generated by dielectric barrier discharge in ambient air

Wu, WJ; Murashima, M; Umehara, N; Tokoroyama, T; Zhang, RX

SURFACES AND INTERFACES Vol. 56 2025.1

The mechanism of small wear particles entrainment in friction under boundary lubrication

Tokoroyama, T; Okashita, M; Zhang, RX; Murashima, M; Tsuboi, R; Yoshida, T; Shiomi, H; Umehara, N

FRONTIERS IN MECHANICAL ENGINEERING-SWITZERLAND Vol. 10 2024.9

Clarification of the Corrosion and Frictional Behavior of Nitrogen-Doped ta-C Coating in Nitride Acid Solution

Zhang, RX; Feng, HD; Umehara, N; Tokoroyama, T

PROCEEDINGS OF ITS-IFTOMM 2024 Vol. 160 page： 13 - 22 2024

Enhancing Cutting Tool Performance through ta-C:Ta Coating for CFRP Dry Machining: Investigation of Wear Resistance and Cutting Forces

Suzuki, K; Tokoroyama, T; Takita, R; Zhang, RX; Umehara, N; Sato, S; Nishida, S

PROCEEDINGS OF ITS-IFTOMM 2024 Vol. 160 page： 159 - 167 2024

Effect of Hydrogen Doping for ta-C on Friction of ta-C:H Sliding Against Bearing Steel in High Temperature and High Vacuum

Zhang, RX; Yasuda, D; Umehara, N; Tokoroyama, T

PROCEEDINGS OF ITS-IFTOMM 2024 Vol. 160 page： 149 - 158 2024

Development of Low-Friction Technology for Treating Nitrogen-Containing Diamond-Like Carbon Coatings in Ambient Air Using Dielectric Barrier Discharge

Wu, WJ; Umehara, N; Tokoroyama, T; Murashima, M; Zhang, RX

PROCEEDINGS OF ITS-IFTOMM 2024 Vol. 160 page： 99 - 106 2024

Proposal of a model for the influence of coating area on the electric field at the tip of electrocautery for suppressing tip charring and surgical smoke generation due to blood heating

Tokoroyama, T; Oh, K; Murashima, M; Umehara, N; Yorozu, T; Uchida, J

JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING Vol. 18 ( 6 ) 2024

ENHANCED TRIBOLOGICAL PERFORMANCE OF TA-C COATINGS BY CONTROLLING DUCT BIAS

Lee, WY; Tokoroyama, T; Murashima, M; Jang, YJ; Umehara, N

7TH INTERNATIONAL CONFERENCE INTEGRITY-RELIABILITY-FAILURE (IRF2020) page： 1053 - 1054 2020

ELUCIDATION OF THE EFFECT OF MoDTC ADDITIVES IN OIL ON LOW FRICTION BY IN-SITU REFLECTANCE OBSERVATION

Hashizume, N; Umehara, N; Tokoroyama, T; Murashima, M

7TH INTERNATIONAL CONFERENCE INTEGRITY-RELIABILITY-FAILURE (IRF2020) page： 1047 - 1048 2020

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

Umehara, N; Kitamura, T; Tokoroyama, T; Murashima, M

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

EFFECTS OF DANGLING BONDS AND SURFACE ENERGY ON THE TRIBOLOGICAL PROPERTIES OF ta-CNx COATING IN UNLUBRICATED CONDITION

Miyachi, T; Nakashima, Y; Lee, W; Umehara, N; Tokoroyama, T; Murashima, M

7TH INTERNATIONAL CONFERENCE INTEGRITY-RELIABILITY-FAILURE (IRF2020) page： 1051 - 1052 2020

Preface

Ando, Y; Tokoroyama, T

JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING Vol. 14 ( 3 ) 2020

Application of oil palm fiber in organic brake friction composite material

Bin Abdollah, MF; Amiruddin, H; Nordin, MJ; Tokoroyama, T; Umehara, N

PROCEEDINGS OF MECHANICAL ENGINEERING RESEARCH DAY 2020 (MERD'20) page： 22 - 23 2020

DEVELOPMENT OF FRICTION STABILIZATION CONTROL USING GENETIC ALGORITHM AND CONTACT POINT CONTROL METHOD

Yamada, T; Murashima, M; Umehara, N; Tokoroyama, T