2026 H. Kawai, T. Tokoroyama, T. Nakahama, S. Horikawa, R. Zhang, N. Umehara, “Effect of water and dissolved oxygen on the wear of stainless steel in high temperature and pressurized ethanol,”
Wear, 603, 206946, Oct 2026. ↗ 2026 S. Sasaki, N. Umehara, T. Tokoroyama, R. Zhang, S. Umeda, R. Fujita, H. Nagano, T. Tamai, R. Ohashi, A. Yamazaki, “Clarification of seizure mechanism in steel treated with nitrocarburizing, sulphonitriding, and oxynitriding,”
Tribology Online, 21(2), 164-172, Jun 2026. ↗ 2026 T. Tokoroyama, K. Suzuki, A. Tanigawa, R. Zhang, N. Umehara, J.I. Kim, J.K. Kim, Y.J. Jang, M. Murashima, “The effect of group 5 metal elements addition to ta-C coating on tribological properties in dry friction,”
Friction, 14(10), 9441264, May 2026. ↗ 2026 W. Yu, Y. Gao, Y. Ni, K. Zheng, J. Wang, N. Umehara, T. Tokoroyama, T. Wang, “Fabrication and Characterization of ZTA/High-Chromium Cast Iron Composites via Al–Fe3O4 Self-Exothermic Powder-Assisted Infiltration,”
Materials Letters, 410, 140297, May 2026. ↗ 2026 Y. Zhao, T. Tokoroyama, R. Zhang, N. Umehara, T. Yorozu, J. Uchida, “Effect of heparin contained on friction properties of catheter guidewires covered with polyurethane resin-based materials against PTFE in saline solution,”
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 20(2), JAMDSM0014, Apr 2026. ↗ 2026 K. Suzuki, T. Tokoroyama, R. Takita, R. Zhang, N. Umehara, S. Sato, K. Yumoto, “Low Friction Properties of ta-C:Ta Coating in Drilling of CFRP,”
Tribology Online, 21(1), 104-115, Mar 2026. ↗ 2026 K. Suzuki, T. Tokoroyama, R. Takita, R. Zhang, M. Murashima, N. Umehara, “Effect of Ta content in ta-C:Ta coatings on cutting performance of aluminum alloy,”
Wear, 594, 206654, Mar 2026. ↗ 2026 J. Luan, Z. Cao, H. Lu, S. Dong, L. Wang, T. Tokoroyama, H. Ju, “Silver-enhanced ZrN-MoSN composite films via magnetron sputtering: Insighting into the microstructure and optimizing self-lubricating properties,”
Surface & Coatings Technology, 524, 133247, Jan 2026. ↗ 2026 L. Li, T. Tokoroyama, W. Wu, F. Xue, N. Jian, D.F. Diao, R. Zhang, N. Umehara, “Role of bonding structure in the corrosion resistance and tribological properties of Tantalum-containing carbon coating: An analysis employing various deposition bias voltages,”
Tribology International, 213, 111014, Jan 2026. ↗ 2025 M. Ueda, T. Tokoroyama, N. Yamashita, T. Hirayama, N. Umehara, “Full-film EHD friction in FM-containing oils,”
Tribology Letters, 74, 5 (2026); published online Dec 2025. ↗ 2025 W. Yu, Y. Gao, N. Umehara, T. Tokoroyama, K. Zheng, Y. Wang, “Study on casting infiltration properties of ZTA/Fe wear resistant composites assisted by self-exothermic powders of Al-Ni2O3,”
Materials & Design, 257, 114496, Sep 2025. ↗ 2025 R. Takasaka, N. Umehara, T. Tokoroyama, R. Zhang, K. Okamura, J. Fukuda, T. Hayashi, K. Abe, S. Wakamatsu, “Abnormal wear due to synergistic effects of corrosion and cavitation in high-speed flow of glycol-based hydraulic fluid valve surfaces,”
Tribology Online, 20(2), 100-109, Jun 2025. ↗ 2025 W. Wu, M. Murashima, N. Umehara, T. Tokoroyama, R. Zhang, “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,”
Surfaces and Interfaces, 56, 105591, Jan 2025. ↗ 2024 T. Tokoroyama, S. Horikawa, J. Mimata, N. Umehara, M. Murashima, “Effect of Water on Wear of DLC Coatings in High Temperature and Pressurized Ethanol,”
Tribology Letters, 72(4), Dec 2024. ↗ 2024 J.I. Kim, W.Y. Lee, K. Tanaka, T. Tokoroyama, M. Murashima, N. Umehara, “Nitrogen-containing diamond-like carbon deposited on glass substrate via filtered cathodic vacuum arc with high-frequency pulsed DC substrate bias,”
Surfaces and Interfaces, 44, 103695, Dec 2024. ↗ 2024 N. Hashizume, R. Takano, N. Umehara, T. Tokoroyama, R. Zhang, K. Hanyuda, A. Otsuka, M. Ueda, “Development of precipitation lubrication with palmitic acid and its friction mechanism,”
Tribology International, 200, 110066, Dec 2024. ↗ 2024 T. Tokoroyama, M. Okashita, R. Zhang, M. Murashima, R. Tsuboi, T. Yoshida, H. Shiomi, N. Umehara, “The mechanism of small wear particles entrainment in friction under boundary lubrication,”
Frontiers in Mechanical Engineering, 10, Sep 2024. ↗ 2024 R. Zhang, W. Y. Lee, N. Umehara, T. Tokoroyama, M. Murashima, Y. Takimoto, “The development of B/Cr co‑doped DLC coating by FCVA deposition system and its tribological properties at 300 °C,”
Surface and Coatings Technology, 487, Jul 2024. ↗ 2024 L. Li, T. Tokoroyama, R. Zhang, M. Murashima, N. Umehara, “Corrosion and Tribological properties of ta-C/ta-C:Ta coatings: Analysis of the influence of ta-O/Ta-C ratio,”
Tribology International, 198, 109916, Jul 2024. ↗ 2024 D. Matsukawa, J.-H. Park, W.-Y. Lee, T. Tokoroyama, J.I. Kim, R. Ichino, N. Umehara, “Tribocatalytic reaction enabled by TiO2 nanoparticle for MoDTC-derived tribofilm formation at ta-C/steel contact,”
Coatings, 14(6), 773, Jun 2024. ↗ 2024 野老山貴行，寺井勇裕，梅原徳次，村島基之，本田晃之，足立常夫, “コハク酸イミド分散剤がATF油中摩擦におけるトライボ被膜の生成に及ぼす影響,”
トライボロジスト, 69(6), 445-458, Jun 2024. ↗ 2024 T. Tokoroyama, Q. Wang, N. Umehara, T. Yorozu, J. Uchida, “Proposal of a model for the influence of coating area on the electric field at the tip of electrocautery for suppressing tip charring and surgical smoke generation due to blood heating,”
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 18(6), JAMDSM0083, May 2024. ↗ 2024 T. Tokoroyama, L. Zhang, W. Wu, M. Murashima, N. Umehara, “Creation of anti-frost micro-plastic texture surfaces enhancing thermal conductivity by carbon black containing in polyvinyl chloride,”
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 18(3), JAMDSM0032, May 2024. ↗ 2024 M. M. B. Mustafa, N. Umehara, T. Tokoroyama, M. Murashima, Y. Utsumi, H. Moriguchi, A. Shibata, “Effect of PAO‑4 and MoDTC + ZnDTP oil additive lubricants on the tribological performance of novel tetrahedral amorphous carbon (ta‑C) coatings,”
Tribology International, 193, May 2024. ↗ 2024 T. Tokoroyama, S. Wang, N. Umehara, M. Murashima, W. Y. Lee, “The ta‑C hardness effect on wear properties under MoDTC‑contained boundary lubrication,”
Tribology Letters, 72(1), Mar 2024. ↗ 2024 N. Hashizume, T. Tokoroyama, N. Umehara, M. Murashima, W. Y. Lee, R. Zhang, M. Kunisu, H. Shioji, K. Oharada, “In situ observation of the formation of MoDTC‑derived tribofilm on a bearing steel with different surface roughness by using reflectance spectroscopy and its effects on friction,”
Tribology Letters, 72(1), Mar 2024. ↗ 2024 T. Tokoroyama, C. Fujiwara, M. Murashima, M. Yamaguchi, N. Umehara, “Effect of the graphite domain direction on the friction coefficient of tetrahedral amorphous carbon nitride,”
Diamond & Related Materials, 143, Mar 2024. ↗ 2024 K. Hirata, M. Murashima, N. Umehara, T. Tokoroyama, W. Y. Lee, N. Hashizume, T. Sato, R. Nagata, K. Hanyuda, A. Otsuka, M. Ueda, “Clarification of the effect of surface energy on tribological behavior of two‑phase lubricant using reflectance spectroscopy and hydrodynamic analysis,”
Tribology Letters, 72(1), Mar 2024. ↗ 2024 T. Tokoroyama, M. Okashita, N. Fusetani, M. Murashima, N. Hashizume, R. Tsuboi, H. Shiomi, N. Umehara, “The 1 μm wear particles entrainment in situ observation via fluorescent staining silica particles by silane coupling with Rhodamine B,”
Frontiers in Mechanical Engineering, 10, 1371948, Feb 2024. ↗ 2024 N. Hashizume, Y. Yamamoto, C. Chen, T. Tokoroyama, R. Zhang, D.F. Diao, N. Umehara, “The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-derived Tribofilm by Using an in situ reflectance spectroscopy,”
Tribology Letters, 72, 30, Feb 2024. ↗ 2024 T. Tokoroyama, M. Murashima, K. Ogawa, N. Umehara, H. Nagano, T. Yorozu, J. Uchida, “Development of an Electrocautery Surface Coating Method to Suppress Surgical Smoke,”
Journal of Surgery & Research, 7(1), 53-59, Feb 2024. ↗ 2023 K. Aono, N. Umehara, T. Tokoroyama, W.Y. Lee, “Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction,”
Tribology Online, 18(6), 292-301, Oct 2023. ↗ 2023 K. Hirata, M. Murashima, N. Umehara, T. Tokoroyama, N. Hashizume, W. Y. Lee, D. Takekawa, K. Narita, “Clarification of the effects of adsorption films of ester‑blended oil on friction by in situ reflectance spectroscopy,”
Tribology International, 187, Sep 2023. ↗ 2023 K. Tanaka, T. Tokoroyama, N. Umehara, M. Murashima, T. Oshio, K. Yagishita, “Effects of phosphonate additives with hydroxy groups on the tribological properties of ta‑C coatings under boundary lubrication,”
Tribology Letters, 71(2), Jun 2023. ↗ 2023 J.I. Kim, W.Y. Lee, T. Tokoroyama, N. Umehara, “Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature,”
ACS Applied Materials & Interfaces, 15(15), 19715-19729, Apr 2023. ↗ 2023 Y. Nakashima, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, K. Murakami, “Influence of defects in graphene‑like network of diamond‑like carbon on silica scale adhesion,”
Tribology Letters, 71(1), Feb 2023. ↗ 2023 M. Murashima, T. Yamada, N. Umehara, T. Tokoroyama, W. Y. Lee, “Novel friction stabilization technology for surface damage conditions using machine learning,”
Tribology International, 180, Feb 2023. ↗ 2023 J.‑I. Kim, W.‑Y. Lee, T. Tokoroyama, M. Murashima, N. Umehara, “Tribo‑chemical wear of various 3d‑transition metals against DLC: Influence of tribo‑oxidation and low‑shear transferred layer,”
Tribology International, 177, 107938, Jan 2023. ↗ 2023 Y. Nakashima, N. Umehara, H. Kousaka, T. Tokoroyama, M. Murashima, D. Mori, “Carbon‑based coatings for suppression of silica adhesion in geothermal power generation,”
Tribology International, 177, 107956, Jan 2023. ↗ 2023 J.I. Kim, W.Y. Lee, T. Tokoroyama, N. Umehara, “Long-term low-friction of Ti-overcoated and-doped DLCs: Robustly developed carbonous transfer layer with titanium,”
Carbon, 204, 268-283, Jan 2023. ↗ 2022 T. Tokoroyama, K. Tanaka, T. Kani, M. Murashima, W. Y. Lee, N. Umehara, T. Oshio, K. Yagishita, “The tribological property of a‑C:H coating with tribolayer by additive having glycerol and phosphate oxide structure,”
Tribology Letters, 70(4), Dec 2022. ↗