2025/04/15 更新

写真a

ヤマシタ セイジ
山下 誠司
YAMASHITA Seiji
所属
大学院工学研究科 物質プロセス工学専攻 先進プロセス工学 助教
大学院担当
大学院工学研究科
学部担当
工学部 マテリアル工学科
職名
助教
連絡先
メールアドレス

学位 1

  1. 博士(工学) ( 2013年3月   名古屋工業大学 ) 

現在の研究課題とSDGs 2

  1. データサイエンスを活用したセラミックス材のトライボロジー特性解析

  2. 自立型無機塩PCM複合蓄熱材の開発

学歴 2

  1. 名古屋工業大学   工学研究科   未来材料創成工学専攻

    2010年4月 - 2013年3月

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    国名: 日本国

  2. 名古屋工業大学   工学研究科   未来材料創成工学専攻

    2008年4月 - 2010年3月

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    国名: 日本国

所属学協会 5

  1. 東海若手セラミスト懇話会   委員

    2014年3月 - 現在

  2. 日本セラミックス協会

  3. 粉体工学会

  4. 化学工学会

  5. 日本エネルギー学会

委員歴 1

  1. 日本セラミックス協会東海支部 若手セラミスト懇話会   若手セラミスト懇話会実行委員  

    2014年4月 - 現在   

 

論文 72

  1. Novel Sodium Chloride/Aluminum Oxide Powder-Composite Structure with High Shape-Retention Performance for the Encapsulation of a High-Temperature Phase-Change Material 査読有り 国際共著

    Processes   12 巻 ( 3 ) 頁: 465 - 479   2024年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.3390/pr12030465

  2. Study on the Repair of Irregular and Deep Cracks Induced by Thermal Shock Using Al-Cu-O Reactions in Al<inf>2</inf>O<inf>3</inf> Ceramics 査読有り Open Access

    Bao F., Yamashita S., Kita H.

    Processes   12 巻 ( 11 )   2024年11月

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    担当区分:責任著者   記述言語:英語   出版者・発行元:Processes  

    The irregular and deep cracks induced by thermal shock in Al2O3 ceramics were repaired by applying Cu powder layer on their surface and heating at 1200 °C under an atmosphere of air. The Al-Cu-O liquid phase formed at 1200 °C by the reaction of molten Cu, oxygen, and Al2O3 phases penetrate deep into the narrow cracks, and the precipitation phases of Cu2O and CuAlO2 densely fill the crack interior. Our observation and analysis of the filled cracks and the surrounding areas of the repaired cracks, as well as the microstructural analysis results obtained through SEM-EDS and TEM observation, suggested the aforementioned crack repair mechanism. The bending strength of the coated surface after repairing the cracks is 301.8 MPa (ΔT = 300 °C), which is twice as strong as the specimen after thermal shock and 10% higher than the original strength of the base material.

    DOI: 10.3390/pr12112606

    Open Access

    Scopus

  3. Development of rice husk composite ceramic sphere with enhanced radiation heat transfer for rapid heat storage and release at high temperature 査読有り

    Liao S., Zhou X., Chen X., Bao F., Zhang H., Yamashita S., Kita H.

    Ceramics International   50 巻 ( 20 ) 頁: 38051 - 38062   2024年10月

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    担当区分:責任著者   記述言語:英語   出版者・発行元:Ceramics International  

    Regenerative burner systems have recently garnered increasing attention in the field of high-temperature thermal storage, the development of thermal storage materials that feature rapid heat storage and release rates along with high infrared absorptivity is significant for enhancing the efficiency of regenerative burner systems. This study innovatively uses rice husk ash as the raw material to develop a rice husk composite ceramic (RHC) sphere thermal storage material, which is simple to prepare, has a greatly reduced cost and compared with conventional thermal storage materials used in commercial regenerative burner systems, such as SiC and Al2O3 ceramic spheres, RHC demonstrates comparable rapid heat storage and release rates to SiC and is significantly faster than Al2O3. In addition, RHC exhibits an impressive radiation absorptivity of 0.93 in the 600–1200 °C range, which is higher than the 0.85 of SiC ceramic spheres and 0.25 of Al2O3 ceramic spheres. The distribution of high radiation absorptivity carbon and SiC particles within RHC is a key factor for its strong radiation properties, as the temperature increases, radiation heat transfer becomes the dominant mode of heat transfer. RHC achieves rapid overall heat storage and release rates due to its excellent radiation heat transfer performance. After 30 cycles of testing, RHC demonstrated good stability and long-term durability. RHC shows a high heat storage capacity of 2183 J/cm3 and 822 J/g in the furnace for 3 min. This study is poised to significantly enhance efficiency in the field of high-temperature rapid heat storage and release applications.

    DOI: 10.1016/j.ceramint.2024.07.167

    Scopus

  4. A time-domain nuclear magnetic resonance (TD-NMR) as a tool to characterize affinity between partially hydrophobic silica nanoparticles and ethanol/hexane mixtures 査読有り

    Teramae A., Takai-Yamashita C., Ikeda J., Yamashita S., Sugiura M., Kato A., Ohya Y., Kinyanjui Kimani P.

    Advanced Powder Technology   35 巻 ( 9 )   2024年9月

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    記述言語:英語   出版者・発行元:Advanced Powder Technology  

    Affinity between partially hydrophobic silica nanoparticles and organic solvents (ethanol and hexane) as dispersing medium has been characterized with change in the relaxation time obtained by a time-domain nuclear magnetic resonance (TD-NMR). Different chain lengths (denoted as C3, C6, and C12) were utilized as surface modifiers for the particles and the modification ratio was controlled. For ethanol, the longer chain length and higher modification ratio showed the higher affinity while for hexane, vice versa even though a quite poor affinity appeared in whole conditions. We hypothesize that the ethanol molecules could be attracted to residual silanol groups among long-chain length-functional groups. In order to prove, affinity of the partially hydrophobic silica nanoparticles with ethanol/hexane mixture has been investigated. In the range from 60 to 80 vol% of hexane, relaxation time of the C12-modified silica nanoparticles (modification ratio was 1.4 /nm2) quickly decreased. When the residual silanol was additionally modified with C3, the corresponding decrease disappeared. The TD-NMR has an effective tool to detect the change in the surface affinity of the partially hydrophobic nanoparticles even if they showed the same hydrophobicity.

    DOI: 10.1016/j.apt.2024.104593

    Scopus

  5. Microstructure modification of alumina prepared by water-stabilized plasma spraying method using Al-Cu-O reaction 査読有り

    Bao F., Yamashita S., Daki H., Nakagawa K., Kita H.

    Journal of the European Ceramic Society   44 巻 ( 10 ) 頁: 6113 - 6123   2024年8月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of the European Ceramic Society  

    To improve the strength of Al2O3 specimens produced using the water-stabilized plasma spraying technique (WSPSAO), this study investigates the effect of structural modification on the mechanical properties of WSPSAO using the Al-Cu-O reaction between the metal, atmospheric oxygen, and base material. A Cu-powder layer is applied to the specimen surface, melted, and oxidized at high temperatures. It penetrates into the specimen, resulting in significant microstructural modification deep in the specimen. After modification, uniaxial Al2O3, CuO, Cu2O, and CuAl2O4 are formed in the specimen, resulting in a denser and more uniform structure than that of the original material. The bending strength of the coated surface is 145 MPa, and that on the opposite side of the coated surface is 118 MPa, which is 130%–180% higher than the original strength of the base material.

    DOI: 10.1016/j.jeurceramsoc.2024.03.016

    Scopus

  6. Development of Macro-Encapsulated Phase-Change Material Using Composite of NaCl-Al<inf>2</inf>O<inf>3</inf> with Characteristics of Self-Standing 査読有り 国際共著 Open Access

    Liao S., Zhou X., Chen X., Li Z., Yamashita S., Zhang C., Kita H.

    Processes   12 巻 ( 6 )   2024年6月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Processes  

    Developing thermal storage materials is crucial for the efficient recovery of thermal energy. Salt-based phase-change materials have been widely studied. Despite their high thermal storage density and low cost, they still face issues such as low thermal conductivity and easy leaks. Therefore, a new type of NaCl-Al2O3@SiC@Al2O3 macrocapsule was developed to address these drawbacks, and it exhibited excellent rapid heat storage and release capabilities and was extremely stable, significantly reducing the risk of leakage at high temperatures for industrial waste heat recovery and in concentrated solar power systems above 800 °C. Thermal storage macrocapsules consisted of a double-layer encapsulation of silicon carbide and alumina and a self-standing core of NaCl-Al2O3. After enduring over 1000 h at a high temperature of 850 °C, the encapsulated phase-change material exhibited an extremely low weight loss rate of less than 5% compared with NaCl@Al2O3 and NaCl-Al2O3@Al2O3 macrocapsules, for which the weight loss rate was reduced by 25% and 10%, respectively, proving their excellent leakage prevention. The SiC powder layer, serving as an intermediate coating, further prevented leakage, while the use of Al2O3 ceramics for encapsulation enhanced the overall mechanical strength. It was innovatively discovered that the Al2O3 particles formed a network structure around the molten NaCl, playing an important role in maintaining the shape and preventing leakage of the composite thermal storage phase-change material. Furthermore, the addition of Al2O3 significantly enhanced the rapid heat storage and release rate of NaCl-Al2O3 compared to pure NaCl. This encapsulated phase-change material demonstrated outstanding durability and rapid heat storage and release performance, offering an innovative approach to the application of salt phase-change materials in the field of high temperature rapid heat storage and release and encapsulating NaCl as a high-temperature thermal storage material in a packed bed system. Compared with conventional salt-based phase-change materials, the developed product is expected to significantly improve the reliability and thermal efficiency of thermal storage systems.

    DOI: 10.3390/pr12061123

    Open Access

    Scopus

  7. Development of redox-type thermochemical energy storage module: A support-free porous foam made of CuMn<inf>2</inf>O<inf>4</inf>/CuMnO<inf>2</inf> redox couple 査読有り

    Chen X., Kubota M., Kobayashi N., Lin S., Deng L., Li J., Yamashita S., Kita H.

    Chemical Engineering Journal   485 巻   2024年4月

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    記述言語:英語   出版者・発行元:Chemical Engineering Journal  

    In this study, we developed a CuMn2O4/CuMnO2-based porous foam thermochemical energy storage (TCES) module, which is free from any supporting materials. The raw material of CuMn2O4/CuMnO2 was synthesized using co-precipitation method which is different with the Pechini method we have used in the previous study, aiming to a large-scale synthesis. The porous foam modules were prepared using polyurethane (PU) foam replica method. We investigated the sintering temperature and holding time as critical parameters affecting the module's mechanical strength, chemical reactivity, and durability. The optimal condition for CuMn2O4/CuMnO2-based porous foam TCES module were identified as 1100 ℃ and 6 h. Our findings suggests that these modules are promising for the fixed-bed reactors in redox-type TCES systems.

    DOI: 10.1016/j.cej.2024.149540

    Scopus

  8. Microstructure modification of alumina prepared by water-stabilized plasma spraying method using Al-Cu-O reaction 査読有り

    Fuhai Bao, Seiji Yamashita, Hajime Daki, Keita Nakagawa, Hideki Kita,

    Journal of the European Ceramic Society     2024年3月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jeurceramsoc.2024.03.016

  9. Novel Sodium Chloride/Aluminum Oxide Powder-Composite Structure with High Shape-Retention Performance for the Encapsulation of a High-Temperature Phase-Change Material Open Access

    Yamashita S., Fuhai B., Shenghao L., Kita H., Hong F.

    Processes   12 巻 ( 3 )   2024年3月

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    出版者・発行元:Processes  

    Inorganic phase-change materials (PCMs) with high melting points have great potential for thermal energy storage systems. Sodium chloride (NaCl) has a high melting point (801 °C) and high latent-heat-storage density (482 kJ/kg). However, it is difficult to encapsulate NaCl using a sintered ceramic shell because of its good wettability against ceramics and high volume-expansion capacity during melting. In this study, a novel NaCl/Al2O3 powder-composite structure was developed as highly stable PCM core material for highly stable encapsulation. The shape-retention performance and the mechanism of NaCl/Al2O3 powder-composite structure during melting were investigated. We have successfully fabricated a NaCl/Al2O3 powder-composite structure, which has a higher NaCl volume ratio of 80 vol% than conventional techniques. The gel-like network structure of Al2O3 particles in molten NaCl was a key structure to keep the shape of the composite ball and to prevent the evaporation of molten NaCl.

    DOI: 10.3390/pr12030465

    Open Access

    Scopus

  10. Enhanced radiation heat transfer performance of Alumina-Spinel composite sphere with hollow structure for rapidly ultra-high temperature thermal storage/release process

    Zhou X., Liao S., Yamashita S., Kubota M., Takeuchi A., Gao P., Liu M., Li R., Zhang C., Kita H.

    Chemical Engineering Journal   479 巻   2024年1月

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    出版者・発行元:Chemical Engineering Journal  

    Heat storage technologies for high temperatures have recently been gaining increasing attention. For heat storage applications at high temperatures, such as industrial regenerative burner systems, the impact of radiant heat transfer on the efficiency of rapid heat storage and release cannot be ignored. Hence, the development of heat storage materials with high infrared radiation absorption is of great significance for energy saving and CO2 emission reduction. Consequently, this study innovatively proposes an advanced composite heat storage material, composited by alumina and a Fe-Co-Mn-Al spinel, with the aim of improving absorptivity. A medium-entropy approach is employed to improve IR absorptivity of alumina. Through the strategic adding of various transition metal oxides, the radiative absorptivity of the alumina material in the 600–1200 °C range increased from an initial 0.2 to an impressive 0.8, provided that doping additives remain below 10 wt%. The high-temperature heat storage material balances cost, heat recovery efficiency and thermal stability. In addition, the heat storage material is prepared as a hollow sphere to further enhance the heat storage density of rapid heat storage/release and reduce cost. Multi-scale numerical simulations are carried out to reveal the heat transfer enhancement mechanisms of modified materials and hollowing. radiative modification can significantly increase the heat storage and release capacity, especially at ultra-high temperatures above 1000 °C. Experimental evaluations using an actual regenerative burner further confirmed the heat recovery performance of this novel heat storage sphere. Comparing with conventional regenerative burner system, heating power remarkably increased by 24.6 %, and the heat storage density of packed bed improved by 16.7 %. This study promises to significantly improve the efficiency of rapid heat recovery at high temperature.

    DOI: 10.1016/j.cej.2023.147381

    Scopus

  11. An in-depth oxidation kinetic study of CuCr<inf>x</inf>Mn<inf>1-x</inf>O<inf>2</inf> (x = 0, 0.1, 0.3) for thermochemical energy storage at medium-high temperature

    Chen X., Kubota M., Kobayashi N., Yamashita S., Kita H.

    Solar Energy Materials and Solar Cells   260 巻   2023年9月

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    出版者・発行元:Solar Energy Materials and Solar Cells  

    In this study, we investigated the effect of Cr doping on CuMn2O4/CuMnO2 and established an oxidation (heat release) kinetic model for CuCrxMn1-xO2 (x = 0, 0.1, 0.3) as an extension of our previous research on developing medium-high temperature (500–1000 °C) redox-type thermochemical energy storage materials. Our objective is to develop a reliable model for predicting the heat release power at constant temperature conditions. The as-prepared samples were characterized using XRD Rietveld refinement, SEM-EDS, and XPS analysis to obtain a more precise crystal structure and elemental states. The oxidation kinetic model was established using an isothermal oxidation method which differs from the method (non-isothermal) used in the previous study. Additionally, the pressure term was also taken into consideration. The reaction models and kinetic parameters of CuMnO2, CuCr0.1Mn0.9O2 and CuCr0.3Mn0.7O2 were determined using master plots and Arrhenius plots. Among all sample, CuCr0.1Mn0.9O2 exhibited the smallest oxidation activation energy of 29.932 kJ/mol, which was significantly lower than the previous value obtained using the non-isothermal method. Combining the reaction rate and heat release, CuCr0.1Mn0.9O2 showed the highest instantaneous power output of 4.69 kW/kg at the oxygen partial pressure of 0.5.

    DOI: 10.1016/j.solmat.2023.112495

    Scopus

  12. Macro encapsulated Cu-based phase change material for high temperature heat storage with characteristic of self-sealing and high durability

    Zhou X., Yamashita S., Kubota M., Zhang C., Hong F., Kita H.

    Applied Thermal Engineering   229 巻   2023年7月

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    出版者・発行元:Applied Thermal Engineering  

    The objective of this research is to develop encapsulated phase change materials with applications exceeding 1000 °C that can be applied to concentrated solar power systems and industrial waste heat recovery. In this study, a macro-encapsulation phase change storage material with a copper-based core and an alumina-based shell was developed by slip-casting method and filling mixture of copper beads and Cu-40 %Al powder. The capsule was able to achieve self-sealing by local oxidation reaction at the entrance without leakage. After aging tests at 1100 °C for up to 1000 h, no leakage or damage was found and mass increase of the encapsulate phase change material was only 4.5 %, confirming the superior durability and oxidation resistance of the encapsulated phase change material. The heat storage density of the copper-based phase change material was evaluated as high as 147 J/g. The heat storage capacity did not decrease after 1000 h and ten cycles of aging. The mechanism of its high durability was explored by morphological observations and Raman spectroscopy. In the original material, a small amount of aluminum was oxidized with priority to alumina which significantly enhanced the durability of the capsules. This macro-encapsulated phase change material exhibits excellent thermal storage performance, as well as self-sealing and durability properties, which are of great significance for improving the efficiency of thermal energy recovery above 1000 °C.

    DOI: 10.1016/j.applthermaleng.2023.120491

    Scopus

  13. Water Vapor Adsorption Behavior of Thermosensitive Polymers for Desiccant Humidity Control Systems Open Access

    Kubota M., Nakai R., Yamashita S., Kita H., Tokuyama H.

    ISIJ International   62 巻 ( 12 ) 頁: 2536 - 2541   2022年12月

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    記述言語:英語   出版者・発行元:一般社団法人 日本鉄鋼協会  

    Desiccant humidity control systems have been garnering considerable attention in the attempt to achieve highly efficient utilization of low-temperature heat exhausted from various industries at temperatures less than 373 K. We have focused on thermosensitive polymers as new desiccants because a large amount of dehumidified water would be expected in the system because of their thermosensitivity. Our previous study focused on the water adsorption behavior of poly(N-isopropylacrylamide) (poly(NIPA)), which has a low critical solution temperature (LCST) of 306 K. In this study, poly(N-isopropylmethacrylamide) (poly(NIPMA)) and poly(2-(dimethylamino)ethyl methacrylate) (poly(DMAEMA)) cross-linked with N,N'-methylenebisacrylamide (MBAA) were investigated. These polymers are known to exhibit thermosensitivity in the temperature range of 313-319 K in water, which is a higher LCST than that of poly(NIPA). Poly(NIPMA) adsorbed water vapor linearly with increasing relative humidity. It was also observed that poly(NIPMA) prepared at MBAA concentrations of 200 mol/m3 exhibited a thermosensitivity in the temperature range of 303-313 K in water vapor adsorption. Meanwhile, poly(DMAEMA) adsorbed little water vapor up to a relative humidity (RH) of 40%; however, it exponentially adsorbed water at RH levels higher than 40%. From the estimation results of effective water adsorptivity, we found that poly(DMAEMA) is applicable in desiccant humidity control systems when the dehumidification process is performed at high RH.

    DOI: 10.2355/isijinternational.isijint-2022-204

    Open Access

    Scopus

    CiNii Research

  14. マハラノビス-タグチ(MT)法を用いたカブトムシ三齢幼虫糞形状による雌雄判別 Open Access

    高井(山下) 千加, 山下 誠司, 馬渕 裕也, 寺前 敦史, 松山 拓矢, 田口 裕己, 虫鹿 太賀, 和田 雄也, Shinta Fitria Novasari, 大矢 豊

    粉体工学会誌   59 巻 ( 12 ) 頁: 620 - 627   2022年12月

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    記述言語:日本語   出版者・発行元:一般社団法人 粉体工学会  

    The Mahalanobis-Taguchi system (MTS) is one of the multi-variate analyses which can classify data by correlations among multi-variables. The MTS has significant advantage of applying a cause analysis which provides effective variable combinations to upgrade the accuracy of the classification. In this study, droppings, which were extruded from Japanese rhinoceros beetle larva were selected to classify into male/female based on their shape-related features using the MTS. Based on the cause analysis, the projected area/Feret's diameter (A/F) and solidity were the best variable combination which all the larval droppings were classified into male/female. Both the variable has surface roughness-related factors with size effect (A/F) without size effect (solidity). The MTS has the great ability to classify from the powders' minor difference and will be an effective tool for particle design in the near future.

    DOI: 10.4164/sptj.59.620

    Scopus

    CiNii Research

  15. Low-Temperature Joining of B4C Ceramics Using Cold-Sprayed Al-8wt%Si Alloy and Microstructure of the Vicinity of the Joint Interface 招待有り 査読有り

      10 巻 ( 12 )   2022年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.3390/pr10122573

  16. Low-Temperature Joining of B<inf>4</inf>C Ceramics Using Cold-Sprayed Al-8wt%Si Alloy and Microstructure of the Vicinity of the Joint Interface Open Access

    Kita H., Gou R., Yamashita S.

    Processes   10 巻 ( 12 )   2022年12月

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    出版者・発行元:Processes  

    A series of studies were conducted to demonstrate the feasibility of low-temperature bonding by the forming and heating an Al-8wt%Si alloy thick film on a B4C surface by cold spraying. The results show that: (1) The cracks near the joining interface are closed by the Al alloy by the process studied in this study, and a joining strength of about 220 and 240 MPa is achieved by low temperature joining of 580 °C and 600 °C, respectively.; (2) The amount of weak intermetallic compounds at the joining interface is reduced; (3) It is assumed that the reduction in the amount of Al-B-C compounds is due to the formation of the β phase during the solidification process of the Al-Si alloy, which hinders the growth of the compounds.; (4) On the primary joint surface, a continuous void group is formed in the vicinity of the β phase that surrounds the α phase, causing a decrease in the joining strength.

    DOI: 10.3390/pr10122573

    Open Access

    Scopus

  17. Aluminum Electrodeposition on the Surface of Boron Carbide Ceramics by Use EMIC–AlCl3 Ions Liquid 査読有り

    Roujia Gou,Jae-Hyeok Park , Seiji Yamashita, Takeshi Hagio, Ryoichi Ichino and Hideki Kita

    Coatings   12 巻   2022年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.3390/coatings12101535

  18. Aluminum Electrodeposition on the Surface of Boron Carbide Ceramics by Use EMIC–AlCl<inf>3</inf> Ions Liquid Open Access

    Gou R., Park J.H., Yamashita S., Hagio T., Ichino R., Kita H.

    Coatings   12 巻 ( 10 )   2022年10月

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    出版者・発行元:Coatings  

    Coating technology is decisively important for metallization of ceramic materials and ceramic metal sealing technology. Previous studies have shown that the network-like structure after penetration of molten aluminum can significantly improve the strength of joint components. However, the direct aluminum coating method is limited by the shape of the substrate. To obtain a dense aluminum film on the surface of B4C, in this study, aluminum was deposited by pulse electroplating in EMIC–AlCl3 ionic liquid. The deposited metals were observed and analyzed by SEM–EDS and XRD. A Vickers hardness tester was adopted as an auxiliary equipment to clarify the film quality. The results show that frequency and duty cycle have significant effects on crystal orientation. The content of oxides in the contact gap reduces the bonding strength of the deposited metal, which provides experimental basis for metal electrodeposition on B4C.

    DOI: 10.3390/coatings12101535

    Open Access

    Scopus

  19. Storage and heat dissipation behavior of a heat storage ball with an Al–xSi alloy core and alumina ceramic shell Open Access

    Zhou X., Bao F., Yamashita S., Kubota M., Kita H.

    Journal of Energy Storage   52 巻   2022年8月

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    出版者・発行元:Journal of Energy Storage  

    Regenerative thermal storage systems are becoming increasingly popular for recycling large amounts of waste heat generated in industrial furnaces every year. In order to improve the efficiency of regenerative burners, encapsulated phase change material consisting of an Al–Si alloy core sealed in a spherical ceramic shell has been proposed as a promising heat storage material. This is due to its melting temperature of 850 K, high heat storage density, and high heat storage rate under high-temperature operating conditions (over 773 K) with a short burner switch time. This study conducted rapidly heat storage simulation based on finite element method, heating and cooling tests and microstructural analysis to compare the properties of conventional solid alumina heat storage balls with those of the proposed core–shell heat storage ball with different Si concentrations. It was confirmed that the core–shell ball can store latent heat and is superior to the conventional solid alumina ball in terms of heat storage rate and heat storage density. The eutectic composition of Al–12.2% Si was determined as the optimal core composition for rapid high-temperature heat storage owing to its high heat phase change rate and density over a short time.

    DOI: 10.1016/j.est.2022.104955

    Scopus

  20. Storage and heat dissipation behavior of a heat storage ball with an Al–xSi alloy core and alumina ceramic shell 査読有り

    Xin Zhou, Fuhai Bao, Seiji Yamashita, Mitsuhiro Kubota Hideki Kita

    Journal of Energy Storage   52 巻   2022年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.est.2022.104955

  21. Effect of Cr Addition on Cu−Mn Spinel/Delafossite Redox Couples for Medium-High Temperature Thermochemical Energy Storage

    Chen X., Kubota M., Kobayashi N., Yamashita S., Kita H.

    ACS Applied Energy Materials   5 巻 ( 5 ) 頁: 5811 - 5821   2022年5月

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    出版者・発行元:ACS Applied Energy Materials  

    In this study, we developed Cu(CrxMn1−x)2O4/ CuCrxMn1−xO2 (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) redox couples for medium-high temperature (500−1000 °C) redox-type thermochemical energy storage systems. Structural characterization, redox behavior, reoxidation behavior and kinetic analysis, heat storage capacity, and cyclability were investigated using SEM-EDS, XRD, TGA, and DSC, respectively. When x = 0−0.5, samples exhibited decreasing operating temperatures with increasing amounts of Cr, whereas they lost their reversibility when x > 0.5. R-CuCr0.1Mn0.9 and R-CuCr0.3Mn0.7 showed a faster reaction rate than R-CuMn because samples with small amounts of Cr required a lower activation energy (Ea) for reoxidation. The DSC results showed that a small amount of Cr improved the heat storage capacity of materials. In the cyclability test, the introduction of a small amount of Cr did not cause the deterioration of cyclic properties.

    DOI: 10.1021/acsaem.2c00178

    Scopus

  22. Effect of Counterbody on Friction and Wear Properties of Copper-MgP-Graphite Composites Prepared by Powder Metallurgy Open Access

    Li R., Yamashita S., Yoshida K., Kita H.

    Processes   10 巻 ( 5 )   2022年5月

     詳細を見る

    出版者・発行元:Processes  

    The purpose of this study was to investigate the influence of different counterbodies against Cu/magnesium phosphate treated graphite (Cu-MgPG) composite materials to find the best material combination in terms of friction coefficient and specific wear amount. A Cu matrix composite reinforced with 10 vol% magnesium phosphate treated graphite and pure Cu powder were prepared by powder metallurgy techniques under the same consolidation processing condition. The friction and wear properties of the composites were investigated at 10 N using a pin-on-disc tribometer on Al2O3, SiC and SUJ2 bearing steel counterbodies. The Cu-MgPG/Al2O3 pair showed the lowest friction coefficient, but the specific wear rate tended to increase slightly when compared with Cu/Al2O3 pair. On the other hands, the Cu-MgPG/SUJ2 pair showed about the same specific wear rate as the Cu/SUJ2 pair, but the friction coefficient was significantly reduced. These phenomena are thought to be due to the fact that the added graphite acts as a solid lubricant during sliding and also suppresses the oxidation behavior of the sliding material.

    DOI: 10.3390/pr10050804

    Open Access

    Scopus

  23. Sex determination of Japanese rhinoceros beetles, Trypoxylus dichotomus (Coleoptera: Scarabaeidae), based on their dropping shape Open Access

    Takai-Yamashita C., Yamashita S., Mabuchi Y., Teramae A., Matsuyama T., Taguchi Y., Mushika T., Wada Y., Novasari S.F., Ikeda J., Ohya Y.

    Advanced Powder Technology   33 巻 ( 5 )   2022年5月

     詳細を見る

    出版者・発行元:Advanced Powder Technology  

    The Mahalanobis-Taguchi system (MTS) is one of the multi-variate analyses which can classify by correlations among multi-variables. It has a significant advantage of applying a cause analysis which provides effective variable combinations to upgrade the accuracy of the classification. In this study, droppings, which were extruded from Japanese rhinoceros beetle larva (called Kabutomushi in Japanese) were classified into male/female based on their shape-related features using the MTS. Their droppings have a spheroid shape of approximately 10 mm in their long axis. Seven features (i.e., variables) were obtained from digital micrographic images using image analysis software, such as height/width (H/M), major/minor (Ma/Mi), perimeter/Feret diameter (P/F), projected area/Feret diameter (A/F), roundness, circularity, and solidity. Although an abnormality rate, which shows how the correlation pattern of one larval dropping is far from any standard ones, has a boundary in order to classify into male/female from 18 larval droppings, 3 larva were judged as the opposite sex. Based on the cause analysis, the A/F and solidity were the best variable combination which all the larval droppings were completely classified into male/female. Why these variables were affected by the sex most seemed to be caused by the gut components, as determined by time-domain nuclear magnetic resonance (TD-NMR). MTS has the great ability to classify from the powders’ minor difference and will be an effective tool for particle design in the near future.

    DOI: 10.1016/j.apt.2022.103552

    Open Access

    Scopus

  24. Effect of Counterbody on Friction and Wear Properties of Copper-MgP-Graphite Composites Prepared by Powder Metallurgy 招待有り 査読有り

    Ruoxuan Li , Seiji Yamashita, Katsumi Yoshida and Hideki Kita

    Processes   10 巻   頁: 804   2022年4月

     詳細を見る

  25. Microstructural analysis of network-like crack structure formed at Al–B4C interface 招待有り 査読有り

    Roujia Gou, Seiji Yamashita, Kiyoto Sekine, Hideki Kita

    Journal of the European Ceramic Society   41 巻 ( 14 ) 頁: 6962 - 6970   2022年3月

  26. Encapsulated Copper-Based Phase-Change Materials for High-Temperature Heat Storage 招待有り 査読有り Open Access

    Zhou X., Yamashita S., Kubota M., Kita H.

    ACS Omega   7 巻 ( 6 ) 頁: 5442 - 5452   2022年2月

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    記述言語:英語   出版者・発行元:ACS Omega  

    In this study, a copper-based capsule, encapsulated by a black alumina shell using a simple method, was developed for higherature heat storage over 1000 °C. The shell was filled with copper beads (diameter = ∼3 mm), the copper-aluminum (Cu-Al) atomized powder (particle size = 150 μm) was filled in the gap, and then it was heat-treated. This eventually formed a high-density, aluminum-rich network around the Cu beads in the shell. Morphological observations indicated that the corrosion of copper oxide (CuO) on the alumina shell was significantly reduced by mixing Al with Cu. When heat-treated in air at 1100 °C, Cu became CuO, which reacted with Al2O3 to form a new compound, CuAl2O4. Owing to this two-step reaction, the area around the hole provided at the top of the spherical shell gets sealed, thereby suppressing the flow of oxygen into the shell (self-sealing function). The mechanism of in situ sealing was detected using X-ray diffraction and scanning electron microscopy analyses. The Cu-(5-10%) Al capsule could endure a 400 h air exposure test at 1100 °C without leakage or cracking. A low weight increase ratio of 3.5% after the exposure revealed good oxidation resistance of the capsule, whereas the slight damage load change of the capsule after the exposure showed good mechanical stability. The results concluded that a Cu-(5-10%) Al capsule for higherature heat storage applications above 1000 °C can be fabricated by a simple process, and it demonstrates excellent durability during the long-term air exposure test. The data obtained in this study can be used as a reference for the design of packed beds in the future.

    DOI: 10.1021/acsomega.1c06751

    Open Access

    Scopus

    PubMed

  27. Frictional characteristics of carbide ceramics in water

    Zhang W., Chen X., Yamashita S., Kubota M., Kita H.

    Journal of Tribology   144 巻 ( 1 )   2022年1月

     詳細を見る

    出版者・発行元:Journal of Tribology  

    Frictional characteristics of carbide ceramics (SiC, B4C-SiC, and B4C) sliding against SiC balls in water were measured over a wide range of test conditions. Carbide ceramics can obtain hydrodynamic lubrication with low friction coefficients at 20 and 40 N; however, carbide ceramics cannot obtain hydrodynamic lubrication with low friction coefficients at 5 N. Carbide ceramics exhibit lower friction coefficients at 20 and 40 N than those at 5 N in each lubrication regime. Carbide ceramics can exhibit a wider application range with low friction at high loads (20 and 40 N). The low friction of carbide ceramics is achieved by the combination of hydrodynamic lubrication and tribochemical reactions. The products of tribochemical reactions of carbide ceramics improve the viscosity of water at or near the worn surfaces of carbide ceramics, promoting the hydrodynamic lubrication for carbide ceramics. B4C ceramic shows lower friction coefficients than those of SiC and B4C-SiC ceramics in boundary lubrication and mixed lubrication at 20 and 40 N.

    DOI: 10.1115/1.4050732

    Scopus

  28. Effects of Additional Mullite Micro-Powder on Rheological Behavior of Highly Concentrated Aqueous Silicon Slurry

    Himoto I., Kita H., Shenghao L., Yamashita S.

    Journal of Chemical Engineering of Japan   54 巻 ( 11 ) 頁: 586 - 592   2021年11月

     詳細を見る

    記述言語:英語   出版者・発行元:公益社団法人 化学工学会  

    Low-thermal-conductive reaction-bonded silicon nitride (RBSN), with a thermal conductivity of 8.08 W/(m · K), was developed by the addition of mullite micro-powder as a rare-earth-free oxide sintering agent to silicon nitride. This addition was expected to generate a glassy grain boundary as well as a solid solution of oxygen across the microstructure of the RBSN, which leads to low thermal conductivity. During the fabrication of a heat-insulating component with a hollow structure made of the RBSN via slip casting and subsequent reaction sintering, it was found that the viscosity of aqueous silicon-mullite slurries decreased evidently by the addition of the mullite micro-powder with ammonium polycarboxylate as a dispersant. The viscosity decreased even though the pH (7–8) of the slurries were maintained, and the particle size distributions did not vary significantly. At the effective mullite content when the viscosity decrease was attained, the ratio of the number of particles of mullite to silicon was approximately 1. Therefore, the viscosity decrease in Si slurry (50 vol%) was primarily caused by the steric hindrance due to the adsorption of dispersant by the mullite particles, preventing the direct contact among the silicon particles, rather than by electrostatic repulsions among the silicon particles. This was also explained through the modality of bimodal dispersion. Thus, it was found that the mullite not only acts as a sintering agent but also facilitates viscosity decrease of highly concentrated aqueous Si slurry, which successfully enables the integration of the slip casting and reaction sintering processes.

    DOI: 10.1252/jcej.20we173

    Scopus

    CiNii Research

  29. Microstructural analysis of network-like crack structure formed at Al–B<inf>4</inf>C interface Open Access

    Gou R., Yamashita S., Sekine K., Kita H.

    Journal of the European Ceramic Society   41 巻 ( 14 ) 頁: 6962 - 6970   2021年11月

     詳細を見る

    出版者・発行元:Journal of the European Ceramic Society  

    The morphology and structure of microcracks extending toward B4C were investigated from a joint obtained by sandwiching Al foil between two B4C ceramic plates and heat-treating at 1000 °C in vacuum. Network-like structures of cracks were seen, and Al penetrated the extremely narrow part at the tip. The molten Al penetrated a narrow area within the cracks and filled them. Several compounds were produced in the primary junction area because of reactions between Al and B4C. However, only pure Al was present within the cracks. Atoms moved easily in a wide joint interface, and a reaction occurred accordingly, whereas in a narrow region inside the micro crack, atoms moved with difficulty even if molten Al penetrated the crack. The fact that the reaction is unlikely to occur inside the crack is consistent with the permeation of Al into the inside of the elongated crack.

    DOI: 10.1016/j.jeurceramsoc.2021.06.043

    Scopus

  30. 7-2-3 エクセルギー解析グラフツールの開発とその生産プロセスへの適用

    北 英紀, 山下 誠司, 窪田 光宏

    日本エネルギー学会大会講演要旨集   30 巻 ( 0 ) 頁: 166 - 167   2021年7月

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    記述言語:日本語   出版者・発行元:一般社団法人 日本エネルギー学会  

    DOI: 10.20550/jietaikaiyoushi.30.0_166

    CiNii Research

  31. Exploring Cu-Based Spinel/Delafossite Couples for Thermochemical Energy Storage at Medium-High Temperature

    Chen X., Kubota M., Yamashita S., Kita H.

    ACS Applied Energy Materials   4 巻 ( 7 ) 頁: 7242 - 7249   2021年7月

     詳細を見る

    出版者・発行元:ACS Applied Energy Materials  

    Cu-based spinel/delafossite couples with Mn and Fe as second cations were synthesized using the Pechini method for medium-high temperature thermochemical energy storage. Physicochemical properties of each sample were investigated. Only CuMn2O4/CuMnO2exhibited favorable redox behavior in the range of 500-1000 °C. Cu-based delafossite can reoxidize at a lower temperature (∼600 °C), which may be related to the existence of a MO6octahedra structure. Through the isothermal oxidation method, CuMn2O4/CuMnO2couple showed a larger oxidation enthalpy of 258.32 ± 15.31 kJ/kg (1402.68 ± 83.13 kJ/L) than 190.35 ± 4.81 kJ/kg (1048.83 ± 26.50 kJ/L) of CuFe2O4/CuFeO2couple. CuMn2O4was chosen for further cyclability test with 20 cycles; the depth of reduction increased gradually and stabilized at 4% change in mass after 13 cycles.

    DOI: 10.1021/acsaem.1c01352

    Scopus

  32. Effects of Additional Mullite Micro-Powder on Rheological Behavior of Highly Concentrated Aqueous Silicon Slurry 招待有り 査読有り

    Iori Himoto, Hideki Kita, Liao Shenghao, Seiji Yamashita

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   54 巻 ( 11 ) 頁: 586 - 592   2021年7月

     詳細を見る

    担当区分:責任著者  

    DOI: https://doi.org/10.1252/jcej.20we173

  33. Effect of Water Temperature on Tribological Performance of B<inf>4</inf>C-SiC Ceramics under Water Lubrication

    Zhang W., Chen X., Yamashita S., Kubota M., Kita H.

    Tribology Letters   69 巻 ( 2 )   2021年6月

     詳細を見る

    出版者・発行元:Tribology Letters  

    Abstract: The tribological performance of B4C-SiC ceramics under water lubrication at different water temperatures was studied. The wear mechanisms of B4C-SiC ceramics sliding in water are expected to be mechanical wear and tribochemical wear. There is only SiO2 film on the wear surfaces of B4C-SiC discs after sliding under different loads, and there is no boron oxide or hydroxide on the wear surfaces of B4C-SiC discs when the water temperature varied between room temperature and 60 °C. The tribochemical reaction of B4C in B4C-SiC ceramics is discovered. The products of tribochemical reaction of B4C in B4C-SiC ceramics are H3BO3 and C, and the residual carbon will be left on the wear surface. B4C-SiC/SiC tribopairs can obtain the lowest friction coefficients and systematic wear rates as sliding in water at water temperature between 40 and 60 °C, which is attributed to the promoted tribochemical reaction of SiC in B4C-SiC ceramics, rather than the tribochemical reaction of B4C in B4C-SiC ceramics. More SiO2 film is gradually formed on the wear surfaces as the sliding distance increases, which can cover or protect more B4C grains. The formation of more SiO2 film results in the reduced friction coefficient, tribochemical wear, and mechanical wear for B4C-SiC ceramics. Graphical Abstract: [Figure not available: see fulltext.].

    DOI: 10.1007/s11249-021-01406-0

    Web of Science

    Scopus

  34. Investigation of Sr-based perovskites for redox-type thermochemical energy storage media at medium-high temperature 招待有り 査読有り

    XiaoyuChen MitsuhiroKubota SeijiYamashita HidekiKita

    Journal of Energy Storage     2021年6月

  35. Investigating the chemical bonding state of graphite powder treated with magnesium(II) phosphate through EELS, TEM, and XPS analysis

    Li R., Yamashita S., Kita H.

    Diamond and Related Materials   116 巻   2021年6月

     詳細を見る

    出版者・発行元:Diamond and Related Materials  

    Graphite is often used as a solid lubricant owing to its unique layered structure. However, graphite powder is susceptible to oxidation at high temperatures. In this study, graphite powder was treated with magnesium(II) phosphate solution to obtain graphite powder with excellent oxidation resistance at high temperatures while retaining its lubricating properties. The oxidation resistance of the obtained graphite powder and original graphite was evaluated at temperatures ranging from room temperature (RT) to 1000 °C. The results show that the initial temperature of graphite oxidation increased by nearly 170 °C. Furthermore, this study confirmed that the treated powder still retains the unique layered structure of graphite, which contributes to its lubricating properties. In addition, to clarify the mechanism of using magnesium(II) phosphate to treat graphite for improving its oxidation resistance, the chemical bonding state was specifically analyzed using electron energy loss spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Therefore, the magnesium(II) phosphate-treated graphite maintains the graphite-based interlayer structure and magnesium(II) phosphate forms a C–O–P chemical bond on the graphite defect to cover the reaction site of graphite, which allows the treated graphite to improve oxidation resistance.

    DOI: 10.1016/j.diamond.2021.108423

    Scopus

  36. Investigation of Sr-based perovskites for redox-type thermochemical energy storage media at medium-high temperature

    Chen X., Kubota M., Yamashita S., Kita H.

    Journal of Energy Storage   38 巻   2021年6月

     詳細を見る

    出版者・発行元:Journal of Energy Storage  

    Thermochemical heat storage system exhibits extraordinary properties compared with sensible or latent heat storage system. Owing to the versatility of perovskite, Sr-based perovskites were investigated for redox-type thermochemical energy storage at medium-high temperature. In this study, SrCoO3-δ, SrFeO3-δ and SrMnO3-δ were prepared via a modified Pechini method. The oxidation enthalpy of each sample was measured using a combination of tubular furnace and DSC. Composition analysis, redox and cyclability tests revealed that SrFeO3-δ possesses favorable behavior validating the design principles.

    DOI: 10.1016/j.est.2021.102501

    Scopus

  37. A study of B<inf>4</inf>C-SiC composite for self-lubrication

    Zhang W., Yamashita S., Kita H.

    Journal of the American Ceramic Society   104 巻 ( 5 ) 頁: 2325 - 2336   2021年5月

     詳細を見る

    出版者・発行元:Journal of the American Ceramic Society  

    A B4C-SiC composite without annealing and two B4C-SiC composites followed by annealing at 1000℃ and 1200℃ for 1 hour in air, respectively, were prepared. The tribological properties of the three composites were evaluated by sliding against SiC balls at room temperature under unlubricated conditions. The B4C-SiC composite can obtain lower friction coefficient by annealing at 1000℃, whereas the friction coefficient of B4C-SiC composite annealed at 1200℃ was significantly increased. The cause for this difference was ascribed to different surface compositions after annealing. The mechanism of self-lubrication of the B4C-SiC composite was the formation of H3BO3 layer.

    DOI: 10.1111/jace.17584

    Web of Science

    Scopus

  38. Investigating the chemical bonding state of graphite powder treated with magnesium(II) phosphate through EELS, TEM, and XPS analysis 招待有り 査読有り

    RuoxuanLi SeijiYamashita HidekiKita

    Diamond and Related Materials     2021年4月

     詳細を見る

    担当区分:責任著者  

    DOI: https://doi.org/10.1016/j.diamond.2021.108423.

  39. B<inf>4</inf>C-SiC Ceramics with Interfacial Nanorelief Morphologies and Low Underwater Friction and Wear

    Zhang W., Chen X., Yamashita S., Kubota M., Kita H.

    ACS Applied Nano Materials   4 巻 ( 3 ) 頁: 3159 - 3166   2021年3月

     詳細を見る

    出版者・発行元:ACS Applied Nano Materials  

    The tribological properties of carbide ceramics (SiC, B4C-SiC, and B4C) sliding against SiC balls in water at a normal load of 20 N in ambient conditions were investigated. Compared with traditional SiC ceramics used as mechanical seal materials, B4C-SiC ceramics exhibit lower friction and wear under water lubrication. The lower coefficient of friction of B4C-SiC ceramics is caused by the nanorelief with a depth of 12 nm formed on their friction surfaces. The water stored in the valleys of nanorelief can provide continuous lubrication to the B4C-SiC ceramic friction surfaces, and the good load carrying capacity makes B4C-SiC ceramics exhibit lower COF under higher load (20 N). In situ formed nanorelief can show beneficial influence on the frictional property of materials under water lubrication. The formation of nanorelief on B4C-SiC ceramics is the result of competition between mechanical wear and tribochemical wear under water lubrication. B4C-SiC ceramics with better tribological properties are expected to replace traditional SiC ceramics as mechanical seal materials under water lubrication. A design idea that using the microhardness difference between the two phases of composite ceramics to in situ prepare relief on the composite ceramic surface to improve the frictional property under water lubrication has been proposed in this study.

    DOI: 10.1021/acsanm.1c00375

    Scopus

  40. Tribological behaviour of B<inf>4</inf>C-SiC composite ceramics under water lubrication: influence of counterpart

    Zhang W., Chen X., Yamashita S., Kubota M., Kita H.

    Materials Science and Technology (United Kingdom)   37 巻 ( 9 ) 頁: 863 - 876   2021年

     詳細を見る

    出版者・発行元:Materials Science and Technology (United Kingdom)  

    The tribological tests under water lubrication have been made on B4C-SiC composite ceramics in contact with different counterparts (Si3N4, Al2O3, and SUJ2 (high carbon chromium steel)). When the B4C-SiC discs slide against different counterparts in water, similar coefficients of friction are obtained, except against SUJ2 counterpart at 40 N. The B4C-SiC discs show the highest wear rate when sliding against Si3N4 counterpart, followed by Al2O3 counterpart, and lastly SUJ2 counterpart. The wear of B4C-SiC disc when sliding in water mainly depends on the nature of counterparts, followed by the hardness of counterparts. As a whole, B4C-SiC/Al2O3 tribo-couple shows better tribological properties when sliding in water as compared to B4C-SiC/Si3N4 tribo-couple and B4C-SiC/SUJ2 tribo-couple.

    DOI: 10.1080/02670836.2021.1961365

    Scopus

  41. Self lubrication of pressureless sintered SiC ceramics Open Access

    Zhang W., Yamashita S., Kita H.

    Journal of Materials Research and Technology   9 巻 ( 6 ) 頁: 12880 - 12888   2020年11月

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    出版者・発行元:Journal of Materials Research and Technology  

    The self lubrication of SiC ceramics prepared by pressureless sintering was investigated by annealing at different temperatures in air. It was found that low coefficient of friction can be obtained for SiC ceramics by annealing, and the coefficient of friction of SiC ceramics decreased with the increase of annealing temperature. The SiC ceramics with annealing at 1500 °C revealed the best self lubricating property, with the coefficient of friction of 0.4, while the coefficient of friction of SiC ceramics without annealing was as high as 0.7. The SiC ceramics with annealing at 1000 °C can show self lubrication over a long sliding distance without increasing wear. The formation of α-cristobalite on the annealed SiC ceramics can further lubricate SiC ceramics and shorten run in period. Self lubrication mechanism of SiC ceramics with annealing is considered that on the one hand, the formation of silicon oxide layers after annealing can reduce the number of SiC grains directly exposed to the sliding interface in the early stage of the sliding, decreasing the number of hard SiC wear particles formed on the sliding interface; and on the other hand, silicon oxide wear particles generated by the wear of the silicon oxide layers formed by annealing can be used as solid lubricant.

    DOI: 10.1016/j.jmrt.2020.09.022

    Open Access

    Web of Science

    Scopus

  42. Effect of counterbody on tribological properties of B<inf>4</inf>C–SiC composite ceramics

    Zhang W., Yamashita S., Kita H.

    Wear   458-459 巻   2020年10月

     詳細を見る

    出版者・発行元:Wear  

    Pressureless sintered B4C–SiC composite ceramics were subjected to dry sliding friction and wear against Al2O3, Si3N4 and SUJ2 bearing steel counterbodies at 5 N, 10 N and 20 N. Friction coefficient and specific wear rate were measured, and wear mechanisms were studied. For the B4C–SiC composite ceramics, both the friction coefficient and specific wear rate were dependent on counterbody materials. However, the influence of counterbody materials on friction coefficient and systematic specific wear rate of B4C–SiC composite ceramics was not obvious at high load, which was attributed to the formation of a number of compaction layers on all the worn surfaces of B4C–SiC composite ceramics against Al2O3, Si3N4 and SUJ2 counterbodies. At the same loads, the wear of B4C–SiC composite ceramics sliding against different counterbodies at low load was mainly controlled by the chemical similarity of counterbody, whereas the wear of B4C–SiC composite ceramics sliding against different counterbodies at intermediate and high loads was mainly controlled by the hardness of counterbody.

    DOI: 10.1016/j.wear.2020.203418

    Web of Science

    Scopus

  43. 7-12 人工物製造プロセスのエクセルギー解析

    北 英紀, 山下 誠司, 窪田 光宏

    日本エネルギー学会大会講演要旨集   29 巻 ( 0 ) 頁: 188 - 189   2020年7月

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本エネルギー学会  

    DOI: 10.20550/jietaikaiyoushi.29.0_188

    CiNii Research

  44. Tribological Properties of B<inf>4</inf>C Ceramics Prepared by Pressureless Sintering and Annealed at Different Temperatures

    Zhang W., Yamashita S., Kumazawa T., Ozeki F., Hyuga H., Kita H.

    Tribology Transactions   63 巻 ( 4 ) 頁: 672 - 682   2020年7月

     詳細を見る

    出版者・発行元:Tribology Transactions  

    B4C ceramics were fabricated by pressureless sintering, and the tribological behaviors of B4C ceramics without and with a postannealing treatment at different temperatures were investigated. It was found that the pores of B4C ceramics prepared by pressureless sintering might cause large fluctuations in the coefficient of friction but did not increase the coefficient of friction. A B2O3 layer was not formed on the B4C ceramics after annealing at 700 °C, whereas an H3BO3 layer was formed on the B4C ceramics after annealing at 1000 and 1200 °C, respectively. B4C ceramics obtained a favorable self-lubricating property after annealing at 1000 or 1200 °C because of the formation of an H3BO3 layer during the annealing treatment. B4C ceramics annealed at 1200 °C exhibited the best self-lubricating properties, with the lowest coefficient of friction of approximately 0.08. The friction and wear mechanisms of B4C ceramics without and with a postannealing treatment are discussed in detail.

    DOI: 10.1080/10402004.2020.1734705

    Web of Science

    Scopus

  45. Effects of load on tribological properties of B<inf>4</inf>C and B<inf>4</inf>C-SiC ceramics sliding against SiC balls Open Access

    Zhang W., Yamashita S., Kita H.

    Journal of Asian Ceramic Societies   8 巻 ( 3 ) 頁: 586 - 596   2020年7月

     詳細を見る

    出版者・発行元:Journal of Asian Ceramic Societies  

    Pressureless sintered B4C and B4C-SiC ceramics were subjected to tests of dry sliding against SiC balls at 5 N, 10 N and 20 N. The effects of load on the respective tribological properties of B4C and B4C-SiC ceramics were studied. Meanwhile, the tribological properties and friction, wear mechanisms of B4C and B4C-SiC ceramics at different loads were compared. Both the friction coefficient and wear rate of B4C ceramics first decreased and then increased with increases in load, while both the friction coefficient and wear rate of B4C-SiC ceramics increased with increases in load. At low load, the B4C-SiC ceramics showeda lower friction coefficient and wear rate. At intermediate load, the B4C ceramics showed a lower friction coefficient, and no difference between the wear rates of B4C and B4C-SiC ceramics was apparent. At high load, the B4C ceramics showed a lower friction coefficient, while the B4C-SiC ceramics showed a lower wear rate. With increases in load from 5 N to 20 N for the B4C ceramics, the wear mechanism changed from adhesive wear to delamination and spalling of tribofilm; for the B4C-SiC ceramics, meanwhile, the wear mechanism changed from surface polishing and mild abrasion to micro-fracture.

    DOI: 10.1080/21870764.2020.1769819

    Open Access

    Web of Science

    Scopus

  46. Tribological properties of SiC-B<inf>4</inf>C ceramics under dry sliding condition

    Zhang W., Yamashita S., Kita H.

    Journal of the European Ceramic Society   40 巻 ( 8 ) 頁: 2855 - 2861   2020年7月

     詳細を見る

    出版者・発行元:Journal of the European Ceramic Society  

    SiC-B4C ceramic composites with different ratios of SiC to B4C were produced. The relative density, mechanical properties, initial surface characteristics, dry sliding tribological properties against SiC ball and worn surface characteristics of the SiC-B4C ceramics were studied. Results of dry sliding tribological tests showed that, 40 wt. % SiC-60 wt. % B4C ceramic composite had the best tribological properties in SiC-B4C ceramic composites. A relief structure with height difference of 10−30 nm between B4C grains and SiC grains is formed after dry sliding. This relief structure, on the one hand, can reduce real contact area on interface, decreasing adhesion effect, and on the other hand, can fix or trap the wear pieces formed on sliding interface during the dry sliding process, reducing the abrasive wear. However, there is a limit to the beneficial influence of decreased adhesion effect and reduced abrasive wear, and an optimum proportion of relief structure. Pores can also fix or trap some wear pieces, reducing the abrasive wear. Under the condition of strong bonding between SiC grains and B4C grains, the SiC-B4C ceramic composites with higher porosity can obtain better tribological properties. In addition, it is observed by AFM that the depth of scratch on B4C grains is shallower than that on SiC grains. Hence, it is demonstrated by micro scale measurement that the wear rate of B4C is lower than that of SiC in this study.

    DOI: 10.1016/j.jeurceramsoc.2020.02.062

    Web of Science

    Scopus

  47. Study on friction behavior of SiC-B<inf>4</inf>C composite ceramics after annealing

    Zhang W., Yamashita S., Kumazawa T., Ozeki F., Hyuga H., Kita H.

    Industrial Lubrication and Tribology   72 巻 ( 5 ) 頁: 673 - 679   2020年6月

     詳細を見る

    出版者・発行元:Industrial Lubrication and Tribology  

    Purpose: This study aims to investigate the friction behavior of SiC-B4C composite ceramics treated by annealing in air sliding against SiC balls. Design/methodology/approach: The dry sliding tests were performed with a ball-on-disk tribometer in ambient air condition. Analysis of friction coefficient, phase compositions of the surfaces, morphologies of worn surfaces of disks and wear scars of balls and surface profiles of wear tracks for disks were carried out using Raman spectroscope, microscope and surface profilometer. Findings: The results show that a self-lubricating layer with the main composition of H3BO3 was successfully fabricated on the surface of SiC-B4C composite ceramics by the annealing treatment in air. When the mass fraction of SiC is more than that of B4C, SiC-B4C composite ceramics show higher friction coefficients, the values of which are 0.38 for 80 Wt.%SiC-20 Wt.%B4C and 0.72 for 60 Wt.%SiC-40 Wt.%B4C, respectively. SiC-B4C composite ceramics show lower friction coefficients when the mass fraction of B4C is more than that of SiC. The low friction coefficients of 40 Wt.%SiC-60 Wt.% B4C composite ceramics (0.16) and 20 Wt.%SiC-80 Wt.% B4C composite ceramics (0.20) are attributed to the formation of a sufficient amount of H3BO3 layer, rather than the layer of silicon oxides. Originality/value: This study will help to understand the friction behavior of SiC-B4C composite ceramics with different ratios of SiC to B4C treated by annealing in air.

    DOI: 10.1108/ILT-08-2019-0350

    Web of Science

    Scopus

  48. Progress in tribological research of SiC ceramics in unlubricated sliding-A review Open Access

    Zhang W., Yamashita S., Kita H.

    Materials and Design   190 巻   2020年5月

     詳細を見る

    出版者・発行元:Materials and Design  

    Silicon carbide ceramics have many excellent properties, such as high melting point, high strength, high thermal conductivity, high hardness, high stiffness, good chemical resistance, good electrical conductivity and remarkable wear resistance. Therefore, SiC ceramics are useful for various tribological applications. Nevertheless, SiC ceramics usually exhibit poor friction characteristics under unlubricated sliding contacts, which can greatly deteriorate the durability and reliability of a tribosystem. In this work, the tribological research progress of SiC ceramics was summarized based on microstructural characteristics, self-lubrication methods, surface characteristics and external factors. First, tribological performance of SiC ceramics can be improved by controlling microstructural characteristics, such as reducing grain size of SiC ceramics, acquiring elongated SiC grains, reducing the content of grain boundary/intergranular phase, crystallizing amorphous grain boundary phases, hardening intergranular phases, controlling cracks propagation way. Second, good self-lubrication property for SiC ceramics can be obtained by annealing heat treatment, adding the secondary phase or producing porous SiC ceramics. Third, tribological performance of SiC ceramics can be improved by proper surface processing or surface modification, such as proper roughness, surface texture or coating technology. Fourth, tribological performance of SiC ceramics is affected by various external factors. Besides, the research trends of SiC ceramic tribology in future were proposed. This work aims to provide some reference for the design of SiC ceramics with high wear resistance and low friction.

    DOI: 10.1016/j.matdes.2020.108528

    Open Access

    Web of Science

    Scopus

  49. Water vapor adsorption on poly(N-isopropylacrylamide) gel cross-linked with N, N′-methylenebisacrylamide

    Kubota M., Mochizuki T., Yamashita S., Kita H., Tokuyama H.

    Materials Today Communications   22 巻   2020年3月

     詳細を見る

    出版者・発行元:Materials Today Communications  

    Water vapor adsorption characteristics and the thermosensitivity for vapor adsorption of poly(N-isopropylacrylamide) gel (NIPA gel) cross-linked with N, N′-methylenebisacrylamide (MBAA) (cross-linked NIPA gel) were investigated for application in desiccant humidity control systems. The cross-linked NIPA gels were prepared via copolymerization of NIPA monomers and MBAA monomers, which were used as crosslinkers, at various reagent concentrations and polymerization temperatures in the range of 283–323 K. The water vapor adsorption isotherms of NIPA homopolymer, MBAA homopolymer, and cross-linked NIPA gels were obtained at adsorption temperatures in the range of 298–323 K using a volumetric gas adsorption apparatus. The water vapor adsorptivity of the cross-linked NIPA gel increased with increasing MBAA monomer concentration and decreasing NIPA monomer concentration. NIPA homopolymer under dry conditions showed weak thermosensitivity for water vapor adsorption between 298 and 313 K. Meanwhile, MBAA homopolymer showed almost no change in water vapor adsorptivity above adsorption temperatures of 298 K. The cross-linked NIPA gels had a similar thermosensitivity to NIPA homopolymer, but its sensitivity might be shifted to higher temperature than NIPA homopolymer. Thermosensitivity of the cross-linked NIPA gel was effective in improving polymer water adsorptivity, necessary for desiccant humidity control systems; however, the adsorption performance of the polymer gel systems investigated require further improvements before practical application will be possible.

    DOI: 10.1016/j.mtcomm.2019.100804

    Scopus

  50. A study on formation mechanisms of relief structure formed in situ on the surface of ceramics

    Zhang W., Yamashita S., Kumazawa T., Ozeki F., Hyuga H., Norimatsu W., Kita H.

    Ceramics International   45 巻 ( 17 ) 頁: 23143 - 23148   2019年12月

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    出版者・発行元:Ceramics International  

    The formation mechanisms of relief structure formed in situ on the surface of B4C–SiC ceramics were studied. The hardness difference between B4C and SiC is one of the formation conditions of relief structure. SiC grains are subjected to a preferential wearing owing to their lower hardness as compared to B4C grains, resulting in the difference of wear rates between B4C grains and SiC grains. Clean, no gap grain boundary in the B4C–SiC ceramics, which can make B4C grains and SiC grains bond firmly protecting them from pulling out, is another formation condition of relief structure.

    DOI: 10.1016/j.ceramint.2019.08.008

    Web of Science

    Scopus

  51. Influence of surface roughness parameters and surface morphology on friction performance of ceramics Open Access

    Zhang W., Yamashita S., Kumazawa T., Ozeki F., Hyuga H., Kita H.

    Journal of the Ceramic Society of Japan   127 巻 ( 11 ) 頁: 837 - 842   2019年11月

     詳細を見る

    記述言語:英語   出版者・発行元:公益社団法人 日本セラミックス協会  

    Influence of both surface roughness and surface morphology on frictional behavior of ceramics during run-in period under dry sliding was investigated simultaneously. Similar average surface roughness (Ra = 0.01-0.02 μm) was produced for the three ceramics: monolithic boron carbide ceramics, boron carbide-silicon carbide composite ceramics and monolithic silicon carbide ceramics. Surface roughness parameters show some influence on friction processes, however, surface morphology is considered as a more important competitive factor. Lower friction coefficient during run-in period and shorter sliding distance up to the steady state condition were observed for the B4C-SiC composite ceramics, which has a different surface morphology from those of monolithic B4C ceramics and monolithic SiC ceramics.

    DOI: 10.2109/jcersj2.19124

    Open Access

    Web of Science

    Scopus

    CiNii Research

  52. Effect of nanorelief structure formed in situ on tribological properties of ceramics in dry sliding

    Zhang W., Yamashita S., Kumazawa T., Ozeki F., Hyuga H., Kita H.

    Ceramics International   45 巻 ( 11 ) 頁: 13818 - 13824   2019年8月

     詳細を見る

    出版者・発行元:Ceramics International  

    Nanorelief structure formed on the surface of B 4 C–SiC ceramics by an in-situ method is reported. The nanorelief structure formed by the in-situ method, which differs from the relief structure produced by laser treatment, results from preferential wearing of SiC particles, which have lower hardness, by free diamond particles and mixed wear particles of B 4 C and SiC during polishing and sliding, respectively. The effect of the nanorelief structure formed by the in-situ method on the sliding dry friction against a SiC ball is examined using a pin-on-disk tribometer. A comparison of dry sliding of the B 4 C–SiC composite ceramics with nanorelief structure to that of SiC ceramics without nanorelief structure reveals that B 4 C–SiC composite ceramics have a lower coefficient of friction and a significantly lower specific wear rate than the SiC ceramics. Worn surface analysis indicates that the nanorelief structure does not disappear after a dry sliding test. The depth of the nanorelief structure formed by the in-situ method ranges from 10 to 40 nm. The friction and wear results are associated with the nanorelief structure formed by the in-situ method.

    DOI: 10.1016/j.ceramint.2019.04.078

    Web of Science

    Scopus

  53. P-7-1 廃棄物を利用したグリーンコンポジットの作製ならびにエクセルギー解析に基づく環境負荷評価

    鶴見 和幸, 山下 誠司, 窪田 光宏, 北 英紀

    日本エネルギー学会大会講演要旨集   28 巻 ( 0 ) 頁: 286 - 287   2019年7月

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    記述言語:日本語   出版者・発行元:一般社団法人 日本エネルギー学会  

    DOI: 10.20550/jietaikaiyoushi.28.0_286

    CiNii Research

  54. Progress in pressureless sintering of boron carbide ceramics–a review

    Zhang W., Yamashita S., Kita H.

    Advances in Applied Ceramics   118 巻 ( 4 ) 頁: 222 - 239   2019年5月

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    出版者・発行元:Advances in Applied Ceramics  

    Boron carbide (B4C) ceramics has many outstanding performance, such as extremely high hardness, low density, high melting point, high elastic modulus, high thermoelectromotive force, high chemical resistance, high neutron absorption cross section, high impact and excellent wear resistance. Therefore, B4C ceramics can be used in various industrial applications, such as lightweight ceramic armour, high temperature thermocouples, neutron absorber, reactor control rods in nuclear power engineering, polishing media for hard materials, abrasive media for lapping and grinding, and wear resistant components (blasting nozzles, die tips and grinding wheels). Pressureless sintering is the method with industrialised application value for B4C ceramics, however, it is impossible to sinter pure B4C ceramics to high densities without additives by pressureless sintering. So sintering additives must be used to promote the densification of B4C ceramics. The different sintering additives used to promote the densification of boron carbide will be described in this review, including carbon additives, metallic additives, oxide additives, non-oxide additives, combined additives and rare earth oxide additives. Finally, the recent research trends for sintering methods and sintering additives of B4C ceramics will also be proposed.

    DOI: 10.1080/17436753.2019.1574285

    Web of Science

    Scopus

  55. Fracture analysis of porous SiSiC ceramics with anisotropic three-dimensional network structure Open Access

    Himoto I., Yamashita S., Kita H.

    Journal of the Ceramic Society of Japan   127 巻 ( 5 ) 頁: 295 - 303   2019年5月

     詳細を見る

    記述言語:英語   出版者・発行元:公益社団法人 日本セラミックス協会  

    The fracture mechanism and reliability of typical dense ceramics can be statistically analyzed using a Weibull distribution as a basis for device design. However, it is not understood if the Weibull distribution can even be applied to highly porous ceramics. In this study, porous Siliconized Silicon Carbide (SiSiC) ceramics with anisotropic three-dimensional network structures in a porosity range of 7192% were fabricated and subjected to a fracture analysis using the results of three-point bending tests. Observations of fracture behavior during the bending tests were conducted using a high-speed camera, image analysis of stress distribution, and observation of crack distribution inside the partially damaged specimens using X-ray computed tomography. The results indicate non-linear behavior with multiple peaks in the loaddisplacement curves. In this regard, the fracture mechanism of the porous SiSiC ceramics was intrinsically different from the brittle fracture of dense ceramics and did not appear to be based on the weakest-link model. However, the Weibull distribution was found to be applicable to the bending strength of the porous ceramics with a confidence coefficient of 0.90. This was because although strain and cracks were generated sporadically during loading, the catastrophic fracture of the porous SiSiC ceramic specimens occurred with a macroscopic crack opening at the bottom of the test specimens, almost the same as a Mode I crack opening in dense ceramics. Furthermore, graded three-layer structures can be formed integrally using the proposed novel replication method with uniaxial pressing, taking the plateau of the stressstrain curve of the template polyurethane foam into account, providing a kind of damage tolerance owing to the sporadic generation and sequential propagation of cracks, manifested as the multiple peaks shown in the loaddisplacement curves.

    DOI: 10.2109/jcersj2.18209

    Open Access

    Web of Science

    Scopus

    CiNii Research

  56. P-5-1 異形シェル型セラミック蓄熱体の開発とコンパクト蓄熱システムへの適合性評価

    赤埴 達也, 山下 誠司, 窪田 光宏, 北 英紀

    日本エネルギー学会大会講演要旨集   27 巻 ( 0 ) 頁: 292 - 293   2018年8月

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    記述言語:日本語   出版者・発行元:一般社団法人 日本エネルギー学会  

    DOI: 10.20550/jietaikaiyoushi.27.0_292

    CiNii Research

  57. P-6-1 中空セラミックス構造体の活用によるコンパクト蓄熱槽の開発

    関井 裕哉, 赤埴 達也, 山下 誠司, 窪田 光宏, 北 英紀

    日本エネルギー学会大会講演要旨集   26 巻 ( 0 ) 頁: 314 - 315   2017年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本エネルギー学会  

    DOI: 10.20550/jietaikaiyoushi.26.0_314

    CiNii Research

  58. Design of Heat Emission Controlled Spherical Container Constructed with Skeletal Ceramic Units Based on Heat Transfer Analysis 査読有り

    Iori Himoto, Seiji Yamashita, Hideki Kita

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   49 巻 ( 9 ) 頁: 850-863   2016年9月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  59. Heat press molding of open-celled porous Si-SiC ceramics consisting of skeletal strut via gelcasting with flexible and thermosetting polyurethane resin

    Himoto I., Yamashita S., Kita H.

    Advanced Powder Technology   27 巻 ( 3 ) 頁: 948 - 958   2016年5月

     詳細を見る

    出版者・発行元:Advanced Powder Technology  

    A novel powder processing method for the fabrication of thin open-celled porous siliconized silicon carbide (Si-SiC) ceramic substrates is reported. Green SiC-carbon (C) substrate is first formed via a newly developed gelcasting method, using an organic-solvent-based slurry comprised of submicron SiC and nanometer C powders, along with a flexible and thermosetting polyurethane resin, based on the replica method with polyurethane foam as a template. Subsequently, the flexible semi-wet green substrate is uniaxially compressed under heating for molding to a set thickness; this is possible because of its thermosetting property (heat press molding). Although the slurry viscosity is highly sensitive to fine fluctuations in the powder volume concentration (PVC; 0.45-0.48), the PVC criterion for homogeneous powder solidification and improvement in the green SiC-C strut quality is determined to be 0.46. At 0.48 PVC, it is confirmed that the formed green SiC-C struts reproduce the template morphologically with a high correlation coefficient of 0.96 for the average strut thickness. As regards the open-celled sintered Si-SiC substrate (thickness: 6 mm), the Si-SiC strut appears to be skeletal with a triangular vertical cross-section, which can be successfully warped or twisted without cracking; furthermore, the mechanical strength is evidently improved via the heat press molding.

    DOI: 10.1016/j.apt.2016.02.031

    Scopus

  60. Heat Press Molding of Open-celled Porous Si-SiC Ceramics Consisting of Skeletal Strut via Gelcasting with Flexible and Thermosetting Polyurethane Resin 査読有り

    Iori HIMOTO, Seiji YAMASHITA and Hideki KITA

    Advanced Powder Technology   27 巻 ( 3 ) 頁: 948-958   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  61. 層状金属水酸化物を利用したヘテロ凝集構造体の作製とその充填層に関する研究

    山下 誠司

    ホソカワ粉体工学振興財団年報   24 巻 ( 0 ) 頁: 129 - 132   2016年

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    記述言語:日本語   出版者・発行元:公益財団法人 ホソカワ粉体工学振興財団  

    <p>粘土鉱物などに代表される層状金属水酸化物粒子は,その結晶構造に由来した特異的な電荷構造を有しており,水溶液中でpHなどの条件により結晶面によって異なる電荷を持つことから通常の粒子とは異なる凝集構造を形成することが知られている.本研究では,特異な表面電荷を利用し層状金属水酸化物粒子の異なる結晶面に金属酸化物微粒子を部分的に吸着させることで得られるヘテロ凝集体を作製し,それらの充填層について評価を行った.本研究室で新規化学蓄熱材料として合成しているMg系層状水酸化物粒子を用いて,Al<sub>2</sub>O<sub>3</sub>微粒子とヘテロ凝集体を作製した複合粒子について化学蓄熱システムへの適用を想定し,充填層における脱水-水和反応性について評価を行うことで,部分的ヘテロ凝集構造を用いた充填層の優位性を明らかにした.</p>

    DOI: 10.14356/hptf.14122

    CiNii Research

  62. Design of heat emission controlled spherical container constructed with skeletal ceramic units based on heat transfer analysis

    Himoto I., Yamashita S., Kita H.

    Journal of Chemical Engineering of Japan   49 巻 ( 9 ) 頁: 850 - 863   2016年

     詳細を見る

    記述言語:英語   出版者・発行元:公益社団法人 化学工学会  

    Authors have been developing a spherical container having an inner wall constructed with skeletal ceramic units for transporting molten aluminum. This container is expected to provide innovative weight reduction and higher heat retaining property compared with current cylindrical containers having an inner wall made of castable refractory. In this study, a spherical inner wall with a combinative structure was designed: molten contacting part of the inner wall was constructed with skeletal unit made of reaction bonded silicon nitride (RBSN), while the non-contacting part with molten was constructed with skeletal unit made of aluminum titanate (AT). The quantity of heat emission from the container, temperature drop of molten in the container and thermal stress at the inner wall, while holding the molten, were simulated by heat transfer analysis. As a result, the spherical container reduced the quantity of heat emission compared with an inner wall constructed with only the RBSN unit, and was more reliable compared with that with only the AT unit. Thus, the new inner wall which enables a combination of light weight, high heat retaining property and reliability was proposed.

    DOI: 10.1252/jcej.15we122

    Scopus

    CiNii Research

  63. セラミックス繊維を複合した多孔質セラミックス濾材の開発

    山下誠司、清水琢真、北 英紀

    濾過分離シンポジウム2015     頁: 9-12   2015年11月

     詳細を見る

    担当区分:筆頭著者   記述言語:日本語  

  64. OS8-38 Statistical Fracture Analysis of Si-SiC Porous Ceramics with Skeletal Structure(Advanced materials,OS8 Fatigue and fracture mechanics,STRENGTH OF MATERIALS)

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics   2015.14 巻 ( 0 ) 頁: 148   2015年

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    記述言語:英語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmeatem.2015.14.148

    CiNii Research

  65. Basic study on development of thermal storage technology at 500°C using CaO/H<inf>2</inf>O hydration reaction

    Kuwata K., Kobayashi N., Esaki T., Iwase D., Kita H., Yamashita S.

    Transport and Energy Processes 2015 - Core Programming Area at the 2015 AIChE Annual Meeting     頁: 66 - 71   2015年

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    出版者・発行元:Transport and Energy Processes 2015 - Core Programming Area at the 2015 AIChE Annual Meeting  

    Scopus

  66. Synthesis of Magunesium based layered hydroxide salts and its chemical heat storage properties 査読有り

    Seiji Yamashita, Yoshimasa Sugie, Hideki Kita

        頁: 4   2014年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  67. 幾何学的側面からの熱制御容器の設計 査読有り

    北英紀、樋本伊織、山下誠司

    セミックス   49 巻 ( 8 ) 頁: 680-685   2014年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

  68. 層状亜鉛水酸化物を前駆体とした機能性粒子の合成 査読有り

    山下誠司、藤 正督、高井千加、白井 孝

    名古屋工業大学先進セラミックス研究センター年報     頁: 29-33   2013年

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    担当区分:筆頭著者   記述言語:日本語  

  69. Investigation of the Morphological Change into the Fabrication of ZnO Microtubes and Microrods by a Simple Liquid Process using Zn Layered Hydroxide Precursor 査読有り

    S. Yamashita, M. Fuji, C. Takai, T. Shirai

    Ceramics Transaction   236 巻   頁: 25-31   2012年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  70. Liquid phase synthesis of ZnO microrods highly oriented on the hexagonal ZnO sheets

    S. Yamashita, H. Watanabe, T. Shirai, M. Fuji, M. Takahashi

    Advanced Powder Technology   22 巻 ( 2 ) 頁: 271-276   2011年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  71. Morphological Change during Drying in the Synthesis of ZnO Microtubes from an Aqueous Solution

    S. Yamashita, H. Watanabe, T. Shirai, M. Fuji, M. Takahashi

    Ceramics Transaction   219 巻   頁: 143-149   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  72. Synthesis of ZnO Microtubes by a Facile Aqueous Solution Process 査読有り

    L. Lin, H. Watanabe, M. Fuji, T. Endo, S. Yamashita, M. Takahashi

    Journal of the American Ceramic Society   92 巻   頁: 165-167   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

▼全件表示

書籍等出版物 2

  1. Exergetic Aspects of Green Ceramic Processing

    Kita H., Himoto I., Yamashita S.

    Green and Sustainable Manufacturing of Advanced Materials  2016年  ( ISBN:9780124114975

     詳細を見る

    Exergy is an index indicating the available energy value that is common to both energy and materials. Going back in history, since exergy was advocated by Rant in 1956 for heat utilization efficiency, it has been used for improving the design and the performance of energy transfer systems and various chemical plants. In this report, the application of exergy analysis to the green processing of ceramics has been attempted in several steps. First, exergy calculations were conducted on the raw materials, energy, and fuels used for manufacturing silicon nitride ceramics. Next, using the values thereby obtained, exergy analysis was performed on two types of silicon nitride process followed by the exergy life-cycle analysis of ceramic heat tubes used for aluminum casting line. Through these studies, the values of long product life that characterize silicon nitride ceramics were revealed.

    DOI: 10.1016/B978-0-12-411497-5.00004-7

    Scopus

  2. Exergetic Aspects of Green Ceramic Processing

    Kita H., Himoto I., Yamashita S.

    Green and Sustainable Manufacturing of Advanced Material  2015年1月  ( ISBN:9780124114975, 9780128045909

     詳細を見る

    Exergy is an index indicating the available energy value that is common to both energy and materials. Going back in history, since exergy was advocated by Rant in 1956 for heat utilization efficiency, it has been used for improving the design and the performance of energy transfer systems and various chemical plants. In this report, the application of exergy analysis to the green processing of ceramics has been attempted in several steps. First, exergy calculations were conducted on the raw materials, energy, and fuels used for manufacturing silicon nitride ceramics. Next, using the values thereby obtained, exergy analysis was performed on two types of silicon nitride process followed by the exergy life-cycle analysis of ceramic heat tubes used for aluminum casting line. Through these studies, the values of long product life that characterize silicon nitride ceramics were revealed.

    DOI: 10.1016/B978-0-12-411497-5.00004-7

    Scopus

講演・口頭発表等 35

  1. MTS(マハラノビスタグチシステム)によるパターン認識を応用した材料特性の評価 招待有り

    山下誠司

    2022年度 粉体工学会中部談話会 見学講演会  2022年9月27日  粉体工学会

     詳細を見る

    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:岐阜県多治見市   国名:日本国  

  2. MTS(マハラノビスタグチシステム)を用いた摺動波形データからのデータマイニング と相関解析

    (名古屋大学) ○山下 誠司・加藤 敏 起・北 英紀

    日本セラミックス協会2022年年会  2022年3月11日  日本セラミックス協会

     詳細を見る

    開催年月日: 2022年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン  

  3. 大型セラミックスバルク体製造技術の開発

    山下誠司

    POWTEX2024 第25回国際粉体工業展  2024年11月28日  一般社団法人日本粉体工業技術協会

     詳細を見る

    開催年月日: 2024年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京ビックサイト   国名:日本国  

  4. マハラノビスータグチ法を用いた顆粒体形状をもとにした分類

    (岐阜大・東北大)〇髙井 千加,(名古屋大)山下 誠司

    粉体工学会 第59回夏期シンポジウム  2024年10月4日  一般社団法人粉体工学会

     詳細を見る

    開催年月日: 2024年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜国立大学付属図書館メディアホール   国名:日本国  

  5. パターン認識(RT 法)を用いた波形データからの特徴量抽出と生体用 リン酸塩ガラスの物性値予測

    山下 誠司,佐谷 駿斗,鈴木 大二朗,李 誠鎬

    粉体工学会 第59回夏期シンポジウム  2024年10月4日  一般社団法人粉体工学会

     詳細を見る

    開催年月日: 2024年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜国立大学付属図書館メディアホール   国名:日本国  

  6. MTS(マハラノビス・タグチシステム)によるパターン認識を応用したろ過成膜過程の評価

    (名古屋大学) ○佐谷 駿斗・山下 誠司・ 萩尾 健史・北 英紀* ・(産業技術総合研究所) 近藤 直樹

    日本セラミックス協会 第37回秋季シンポジウム  2024年9月11日  日本セラミックス協会

     詳細を見る

    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  7. RT 法(パターン認識)を活用した摺動波形からの特徴量抽出と材料特性解析

    山下 誠司・ 伊藤 陽祐・佐谷 駿斗・北 英紀

    日本セラミックス協会 第37回秋季シンポジウム  2024年9月10日  日本セラミックス協会

     詳細を見る

    開催年月日: 2024年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  8. Development of rice husk composite ceramic sphere with enhanced radiation heat transfer for high temperature 国際会議

    Shenghao Liao, Seiji Yamashita, Hideki Kita

    14th International Conference on Ceramic Materials and Components for Energy and Environmental Systems  2024年8月19日 

     詳細を見る

    開催年月日: 2024年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Budapest, Hungary  

  9. マハラノビス‐タグチ法を用いた粉体構造のパターン診断

    (岐阜大学・東北大学) ○高井 千加・(名古屋大学)

    2023年セラミックス協会秋季シンポジウム  2023年9月6日  日本セラミックス協会

     詳細を見る

    開催年月日: 2023年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都工芸繊維大学 松ヶ崎キャンパス   国名:日本国  

  10. 水プラズマ溶射法で作製したセラミックスバルクの金属浸透・反応を利用した改質とその強度向上効果

    包 福海・山下 誠司・(大阪富士工業株式会社) 駄木 初・中川 敬太・(名古屋大学 大学院工学研究科) 北 英紀*

    2023年セラミックス協会秋季シンポジウム  2023年9月6日  日本セラミックス協会

     詳細を見る

    開催年月日: 2023年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都工芸繊維大学 松ヶ崎キャンパス   国名:日本国  

  11. RT 法によるパターン認識を利用した摺動波形データからの摺動過程解析

    (名古屋大学) ○山下 誠司・畑 勇吾・北 英紀

    日本セラミックス協会2023年年会  2023年3月10日  日本セラミックス協会

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

  12. Al-Cu-O反応を利用した水プラズマ溶射Al2O3材の強度向上に関する研究

    (名古屋大学)○山下誠司・Bao Fuhai・北 英紀・ (大阪富士工業㈱)駄木 初・桑原翔一・中川敬太

    日本セラミックス協会2023年年会  2023年3月10日  日本セラミックス協会

     詳細を見る

    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

  13. 材料からの声を解釈する品質工学的手法で 粉体の魅力を引き出す! 国際会議

    山下誠司

    2022年国際粉体工業展 アカデミックコーナー  2022年9月27日  粉体工学会

     詳細を見る

    開催年月日: 2022年9月

    記述言語:日本語   会議種別:ポスター発表  

    開催地:幕張メッセ   国名:日本国  

  14. MgOの水溶媒中での 水和反応促進と化学蓄熱への適用

    (名大院工) ○(正)山下 誠司・(正)窪田 光宏・ (正)北 英紀 (北陸テクノ) 木倉 正明

    化学工学会第53回秋季大会  2022年9月16日  化学工学会

     詳細を見る

    開催年月日: 2022年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

  15. シャノンエントロピーを用いた多成分系の混合度評価

    (名古屋大学) ○山下 誠司・中西 勇介・Liao Shenghao・北 英紀

    日本セラミックス協会2022年年会  2022年3月11日  日本セラミックス協会

     詳細を見る

    開催年月日: 2022年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

  16. 機械学習(MT 法)を用いたセラミック ス材の摺動特性データの解析

    山下誠司

    2021 年度第 2 回粉体グリーンプロセス研究会講演会  2021年12月27日  粉体グリーンプロセス研究会

     詳細を見る

    開催年月日: 2021年12月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:オンライン  

  17. NaCl/Al2O3微粒子複合構造を有する潜熱蓄熱材の開発

    (名大院工) ○(正)山下 誠司・ 廖 聖豪・ (正)窪田 光宏・ (正)北 英紀

    化学工学会第52回秋季大会  2021年9月23日  化学工学会

     詳細を見る

    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

  18. 水プラズマ溶射を利用した大型セラミックスバルク体の省エネルギー製造プロセスの開発

    (名古屋大学) ○山下 誠司・包 福海・北 英 紀・(大阪富士工業株式会社) 駄木 初・桑原 翔一・中川 敬太

    日本セラミックス協会第34回秋季シンポジウム  2021年9月2日  日本セラミックス協会

     詳細を見る

    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン  

  19. 黒色アルミナ材を利用したリジェネバーナーシステム用蓄熱球の開発

    ○山下 誠司・若森 惇太・周 シン・北 英紀・(中部 電力ミライズ株式会社) 竹内 章浩

    日本セラミックス協会第34回秋季シンポジウム  2021年9月2日  日本セラミックス協会

     詳細を見る

    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン  

  20. 高濃度・低粘性BN/Al2O3スラリーの調製と複合セラミックスへの応用 国際会議

    山下誠司

    国際粉体工業展2018 アカデミックコーナー 

     詳細を見る

    開催年月日: 2018年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京ビックサイト   国名:日本国  

  21. 濃度BN/Al2O3ヘテロ凝集スラリーの開発とh-BN分散複合セラミックスへの応用

    山下誠司、中島綾衣梨、市川諒、窪田光宏、北 英紀

    日本セラミックス協会 第30回秋季シンポジウム 

     詳細を見る

    開催年月日: 2017年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  22. メタポーラスセラミックスの離散的破壊挙動の解析

    山下誠司、天川絢介、窪田光宏、北 英紀

    日本セラミックス協会 第30回秋季シンポジウム 

     詳細を見る

    開催年月日: 2017年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学   国名:日本国  

  23. The effect of the addition of Al2O3 particle on the rheological property of highly concentrated h-BN surly 国際会議

    Seiji Yamashita, Airi Nakashima, Mitsuhiro Kubota, Hideki Kita

    7th Asian Particle Technology Symposium (APT2017) 

     詳細を見る

    開催年月日: 2017年7月 - 2017年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Taiwan   国名:日本国  

  24. 高濃度窒化ホウ素スラリーの粘性に及ぼす微粒子添加効果

    山下誠司、中島綾衣梨、窪田光宏、北 英紀

    化学工学会 第82回年会(2017) 

     詳細を見る

    開催年月日: 2017年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:芝浦工大   国名:日本国  

  25. B 4 C 系複合材料の摺動時における界面反応とトライボロジー 特性

    山下誠司、浦野晃弘、北 英紀

    化学工学会 第82回年会(2017) 

     詳細を見る

    開催年月日: 2017年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:芝浦工大   国名:日本国  

  26. Ceramic Components for Thermal Management and the Exergy Analysis 招待有り 国際会議

    Hideki KITA , Seiji YAMASHITA

    5th Annual World Congress of Advanced Materials-2016 (WCAM-2016) 

     詳細を見る

    開催年月日: 2016年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Chongqing, China   国名:中華人民共和国  

  27. Mg-LHS の脱水水和反応を利用した化学蓄熱材料の開発

    山下誠司、杉江由匡、北 英紀

    日本セラミックス協会東海支部 学術研究発表会 

     詳細を見る

    開催年月日: 2015年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学   国名:日本国  

  28. 金属系PCMコアを内包したセラミックスシェル構造体の蓄熱特性に関する研究

    山下誠司、北 英紀

    日本潜熱工学会シンポジウム 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢大学   国名:日本国  

  29. セラミックス繊維を複合した多孔質セラミックス濾材の開発

    山下誠司,清水琢真,北 英紀

    世界濾過工学会 濾過分離シンポジウム 

     詳細を見る

    開催年月日: 2015年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:TIME24ビル(東京)   国名:日本国  

    多孔質セラミックスは、耐熱性や耐食性に優れており機械的強度が高いことから、高温や高圧下での濾材として利用されている。また、ケーク濾過を利用したセラミックスの鋳込み成形用の濾材としても石膏が用いられてきが、耐久性や精度に課題がった。そこで我々は、従来の鋳込み成形に多孔質セラミックス型を使用することで、生産性、成形性に優れた新規連続鋳込み成形プロセスの開発を目指している。本研究では、アルミナ繊維とアルミナ粒子の焼結時の収縮異方性を利用することで、造孔材などテンプレート用いない簡便なプロセスで多孔体を作製し、繊維添加量や焼成温度などの作製条件が濾材の気孔構造及び濾過抵抗へ及ぼす影響を評価した。また、セラミックススラリーのケーク濾過性能についての評価を行い、鋳込み成形型としての有用性を検証した。

  30. Mg系層状水酸化物粒子充填層の構造制御および化学蓄熱特性の評価

    山下誠司、杉江由匡、西川 綾、北 英紀

    第53回 粉体に関する討論会 

     詳細を見る

    開催年月日: 2015年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:岐阜県高山市民文化会館   国名:日本国  

    Mg系層状水酸化物粒子充填層の構造制御および化学蓄熱特性の評価に関する研究

  31. Mg-based Layered Hydroxide Salts and these packing reactor for chemical heat storage 国際会議

    Seiji Yamashita, Aya Nishikawa, Hideki Kita

    ICCCI2015 The 5th Int'l Conf. on the Characterization and Control of Interfaces for High Quality Advanced Materials and the 51st Summer Symposium on Powder Technology 

     詳細を見る

    開催年月日: 2015年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  32. Chemical heat storage property of Mg layered hydroxide salts and these porus packing bed 国際会議

    S. Yamashita, H. Kita

    11th International Symposium on Ceramic Materials and Components for Energy and Environmental Applications 

     詳細を見る

    開催年月日: 2015年6月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:カナダ  

  33. Fabrication and chemical heat storage property of Mg layered hydroxide salts 国際会議

    S. Yamashita, Y. Sugie, H. Kita

    40th International Conference and Expo on Advanced Ceramics and Composites 

     詳細を見る

    開催年月日: 2015年1月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  34. The synthesis of layered zinc hydroxide chloride and its photoluminescence property 国際会議

    Seiji Yamashita, T. Shirai, M. Fuji, H. Kita

    The 7th World Congress on Particle Technology 

     詳細を見る

    開催年月日: 2014年5月

    記述言語:英語   会議種別:ポスター発表  

    国名:中華人民共和国  

  35. 層状塩基性ハロゲン化亜鉛の液相合成とその蛍光特性

    山下誠司、白井 孝、藤 正督、北 英紀

    化学工学会 第79年会 

     詳細を見る

    開催年月日: 2014年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:岐阜大学   国名:日本国  

▼全件表示

共同研究・競争的資金等の研究課題 8

  1. カーボンニュートラルに向けた脱炭素・再生可能エネルギーの有効活用と熱エネルギーマネジメントに関する国際標準化

    2023年4月 - 2026年3月

    標準化事業 

    山下誠司

      詳細を見る

    担当区分:その他  資金種別:競争的資金

  2. 化学蓄熱デバイスの開発

    2022年10月 - 2024年4月

    共同研究

      詳細を見る

    担当区分:研究代表者 

    配分額:1300000円 ( 直接経費:1000000円 、 間接経費:300000円 )

  3. 次世代ファインセラミックス製造プロセスの基盤構築・応用開発

    研究課題番号:P22005  2022年4月 - 2026年3月

    次世代ファインセラミックス製造プロセスの基盤構築・応用開発 

    山下誠司

      詳細を見る

    資金種別:競争的資金

    配分額:10000000円

  4. 微粒子吸着構造を利用したh-BN複合セラミックヒートシンク材の開発

    2017年4月 - 2018年3月

  5. 金属溶解ヒータ用非酸化物系セラミックスならびにその応用に関する研究

    2017年4月 - 2018年3月

    株式会社ヤマト 平田享寛

  6. アルミ溶湯浸漬用高出力セラミックヒータの実用化技術開発

    2015年10月 - 2017年3月

    中堅・中小企業への橋渡し研究開発促進事業 

    北 英紀

      詳細を見る

    資金種別:競争的資金

  7. 層状金属水酸化物を利用したヘテロ凝集構造体の作製とその充填層に関する研究

    2015年4月 - 2016年3月

      詳細を見る

    本研究は、層状水酸化物の水溶媒中での特異な表面電荷を利用し、セラミックス粒子を層状水酸化物粒子のエッジ部にのみに吸着した凝集体を調製し、充填した際に緻密化せずに気体が通過する均一なパス構造を有する充填層の作製することを目的とする。

  8. 未利用熱エネルギー革新的活用技術研究開発

    2013年10月 - 2015年3月

    経済産業省委託費 

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    資金種別:競争的資金

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科研費 1

  1. スケルトン構造体の破壊事象の時系列解析

    研究課題/研究課題番号:16K14413  2016年4月 - 2018年3月

    北 英紀

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    担当区分:連携研究者 

    Si-SiC系の高気孔率多孔質材(メタポーラス体)が荷重-変位曲線上に明らかな不連続が生じ、見かけ上、離散的な破壊を生じていることを確認している。この離散的な破壊に着目し、最終的には設計手法と寿命予測法の構築を目指す一連の研究の中で、本研究ではSi-S iCメタポーラスセラミックスを対象として、アコースティックエミッション(AE)を活用した破壊現象の解析を行った。

産業財産権 2

  1. カブトムシ幼虫の糞を用いた雌雄判別方法

    山下誠司、高井千加

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    出願人:名古屋大学

    出願番号:特願2022-033083  出願日:2022年3月

  2. セラミックス複合材およびその製造方法

    北 英紀、山下誠司

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    出願番号: 2014-141171  出願日:2014年7月

    出願国:国内  

 

担当経験のある科目 (本学) 24

  1. マテリアル工学実験基礎

    2024

  2. マテリアル工学実験応用

    2024

  3. 学生実験1

    2021

  4. 学生実験2

    2020

  5. 学生実験1

    2020

  6. 学生実験2

    2019

  7. 学生実験1

    2019

  8. 物理化学実験

    2018

  9. 化学工学実験

    2018

  10. 物理化学実験

    2017

  11. 化学工学実験

    2017

  12. プロセス基礎セミナー

    2017

  13. プロセス基礎セミナー

    2016

  14. 化学工学実験

    2016

  15. 物理化学実験

    2016

  16. 物理化学実験

    2015

  17. プロセス基礎セミナー

    2015

  18. 化学工学実験

    2015

  19. 化学工学実験

    2014

  20. 物理化学実験

    2014

  21. プロセス基礎セミナー

    2014

  22. 化学工学実験

    2013

  23. 物理化学実験

    2013

  24. プロセス基礎セミナー

    2013

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担当経験のある科目 (本学以外) 2

  1. 無機化学Ⅰ

    2017年4月 - 2018年3月 名城大学)

  2. 無機化学Ⅱ

    2017年4月 - 2018年3月 名城大学)