The effect of group 5 metal elements addition to ta-C coating on tribological properties in dry friction

Takayuki Tokoroyama, Kosuke Suzuki, Asato Tanigawa, Ruixi Zhang, Lulu Li, Noritsugu Umehara, Jongkuk Kim, Jae-Il Kim, Young-Jun Jang, Motoyuki Murashima

Friction   2026年5月

Low Friction Properties of ta-C:Ta Coating in Drilling of CFRP

Kosuke Suzuki, Takayuki Tokoroyama, Riko Takita, Ruixi Zhang, Noritsugu Umehara, Shun Sato, Kenji Yumoto

Tribology Online   2026年3月

Role of bonding structure in the corrosion resistance and tribological properties of Tantalum-containing carbon coating: An analysis employing various deposition bias voltages

Lulu Li, Takayuki Tokoroyama, Ruixi Zhang, Wenjun Wu, Xue Fan, Nan Jian, Dongfeng Diao, Noritsugu Umehara

Tribology International   2026年1月

Proposal for Improving the Oxidation Resistance of DLC Coatings

Ruixi Zhang

2025年11月

Abnormal Wear due to Synergistic Effects of Corrosion and Cavitation in High-Speed Flow of Glycol-Based Hydraulic Fluid Valve Surfaces

Ryota Takasaka, Noritsugu Umehara, Takayuki TOKOROYAMA, Ruixi Zhang, Koichi Okamura, Junichi Fukuda, Tetsuya Hayashi, Kohei Abe, Satoshi Wakamatsu

Tribology Online   2025年6月

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

Wenjun Wu, Motoyuki Murashima, Noritsugu Umehara, Takayuki Tokoroyama, Ruixi Zhang

Surfaces and Interfaces   2025年1月

In situ Observation of the Formation of MoDTC-Derived Tribofilm on a Bearing Steel with Different Surface Roughness by Using a Reflectance Spectroscopy and Its Effects on Friction 査読 国際共著

Hashizume, N., Tokoroyama, T., Umehara, N., Murashima, M., Lee, W.-Y., Zhang, R., Kunisu, M., Shioji, H., Oharada, K.

Tribology Letters   72 ( 1 )   2024年3月

The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-Derived Tribofilm by Using an In Situ Reflectance Spectroscopy

Hashizume, N., Yamamoto, Y., Chen, C., Tokoroyama, T., Zhang, R., Diao, D., Umehara, N.

Tribology Letters   72 ( 1 )   2024年3月

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

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

Frontiers in Mechanical Engineering   10   2024年

Development of precipitation lubrication with palmitic acid and its friction mechanism

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

Tribology International   200   2024年

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

Li, L., Tokoroyama, T., Zhang, R., Umehara, N.

Tribology International   198   2024年

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

Ruixi Zhang

Mechanism Design for Robotics   2024年

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

Wenjun Wu, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima, Ruixi Zhang

Mechanisms and Machine Science   160 MMS   99 - 106   2024年

Effect of hydrogen doping for ta-C on friction of ta-C:H sliding against bearing steel in high temperature and high vacuum 査読

R. Zhang, D. Yasuda, N. Umehara, T. Tokoroyama

Proceedings of the 5th International Tribology Symposium of IFToMM in “Mechanism and Machine Science   2024年

1D Heterostructures grown on Semi-conducting Single-walled Carbon Nanotube Thin Film 国際共著 国際会議

Shuhui Wang, Ming Liu, Ya Feng, Chiyu Zhang, Koki Kozaki, Ruixi Zhang, Yongjia Zheng, Keigo Otsuka, Shohei Chiashi, Takeshi Tanaka, Hiromichi Kataura, Rong Xiang, Yuhuang Wang, Shigeo Maruyama

NT22: The 22nd International Conference on the Science and Application of Nanotubes and Low-Dimensional Materials  2022年6月 

Synthesis and Structural Characterization of Boron Nitride Nanotubes with the Chirality-Sorted Carbon Nanotubes as the Template 国際会議

Ruixi Zhang, Ya Feng, Henan Li, Akihito Kumamoto, Shuhui Wang, Yongjia Zheng, Ming Liu, Wanyu Dai, Keigo Otsuka, Takeshi Tanaka, Hiromichi Kataura, Yuichi Ikuhara, Shigeo Maruyama, Rong Xiang

NT22: The 22nd International Conference on the Science and Application of Nanotubes and Low-Dimensional Materials  2022年6月 

Synthesis of Boron Nitride Nanotubes with the Chirality-Sorted Carbon Nanotubes as the Template

Ruixi Zhang, Ya Feng, Yongjia Zheng, Ming Liu, Keigo Otsuka, Takeshi Tanaka, Hiromichi Kataura, Rong Xiang, Shigeo Maruyama

FNTG62: The 62nd Fullerenes-Nanotubes-Graphene General Symposium  2022年3月  The Fullerenes, Nanotubes and Graphene Research Society

Synthesis and Structural Characterizations of Zeolite-supported Coaxial Carbon Nanotubes and Boron Nitride Nanotubes Van der Waals Heterostructures 国際会議

Ruixi Zhang, Ya Feng, Henan Li, Yongjia Zheng, Rong Xiang, Shigeo Maruyama

NT21: The 21st International Conference on the Science and Application of Nanotubes and Low-Dimensional Materials  2021年6月 

The Tribological Behavior of DLC Coatings Induced by B/Cr Co-Doping and Clarification of Their Mechanism 国際会議

Ruixi Zhang, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima, Yuji Takimoto

International Tribology Conference Sendai 2019  2019年9月 

The tribological properties of DLCs with various dopants and clarification of the mechanism at 200℃ 国際会議

Ruixi Zhang, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima

The 8th International Conference on Manufacturing, Machine Design and Tribology  2019年4月 

300℃大気中無潤滑下におけるDLC膜の摩擦特性に及ぼす相手材の影響

張鋭璽, 梅原徳次, 野老山貴行, 村島基之

第9回トライボロジー秋の学校 in 愛知  2018年10月