PUBLICATION

Refereed Journal Papers



31.   Developing a Synthesis Process for Large-scale h-BN Nanosheets Using Magnetron Sputtering and Heat Annealing          Yuki Hirata, Kanta Yoshii, Mikito Yoshizato, Hiroki Akasaka and Naoto Ohtake         Advanced Engineering Material  25 (2023) 2300933
30.   Diamond-like Carbon Film Coatings on Soft Metal Substrates (軟質金属基材上へのダイヤモンド状炭素膜コーティングの試み)        Makoto Matsuo, Takanori Yamaki, Yuki Hirata, Yukio Tamura, Hiroshi Yamamoto, Toshio Ozawa, Gangyi Pan, Hiroki Akasaka, Naoto Ohtake        Transactions of the JSME (in Japanese) 89 (2023) 1-2029.   Evaluation of mechanical and antibacterial properties of Cu-DLC composite films         Yucheng Li, Chiaki Koga, Yuki Hirata, Hiroki Akasaka, Hiroyasu Kanetaka, Naoto Ohtake        Mechanical Engineering Journal 10 (2023) 1-1128.   Characterization of Structural and Mechanical Properties of DLC Films Deposited on the Surface of Minute-scale 3D Objects: Comparison of PECVD and FCVA Deposition Technique        Yuki Hirata, Kotaro Kawai, Toyohiro Kato, Hayata Fujimoto, Yuto Tameno, Takumi Ishikawa, Hiroshige Matsuoka, Hiroki Akasaka and Naoto Ohtake         Surface and Coating Technology 420 (2023) 12940127.   Characterization of carburized layer on low-alloy steel fabricated by hydrogen-free carburizing process using carbon ions        Takeshi Konno, Toyohiro Kato, Toshiaki Yanagida, Hiroshi Inaba, Yuki Hirata, Hiroki Akasaka, and Naoto Ohtake        Diamond & Related Materials 135 (2023) 10981626.   X-ray photoemission electron microscopy observation of wear tracks on hydrogenated amorphous carbon films after ball-on-disk tests        Sota Norizuki, Sarayut Tunmee, Chanan Euaruksakul, Ukit Rittihong, Keisuke Suzuki, Masashi Tomidokoro, Hideki Nakajima, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Diamond & Related Materials 132 (2023) 10968225.   Investigation of the structure and tribological properties of laser-irradiated hydrogenated amorphous carbon films        Dai Harada, Sarayut Tunmee, Chanan Euaruksakul, Ukit Rittihong, Hideki Nakajima, Yuko Aono, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka.         Diamond & Related Materials 131 (2022) 10957324.   Oriented sp2 bonded carbon structure of hydrogenated amorphous carbon films        Naoki Umada, Kazuhiro Kanda, Masato Niibe, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Diamond & Related Materials 131 (2022) 10953323.   Deposition phenomena of diamond-like carbon coating on inner surface of circular metal tube by nanopulse plasma chemical vapor deposition        Yoshinao Iwamoto, Yuki Hirata, Ryouta Takamura, Hiroki Akasaka, Naoto Ohtake         Diamond & Related Materials 121 (2022) 10874922.   Electrical Conduction Properties of Hydrogenated Amorphous Carbon Films with Different Structures          Masashi Tomidokoro, Sarayut Tunmee, Ukit Rittihong, Chanan Euaruksakul, Ratchadaporn Supruangnet, Hideki Nakajima, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Materials 14 (2021) 235521.   Synthesis of Multilayered DLC Films with Wear Resistance and Antiseizure Properties         Yucheng Li, Jun Enomoto, Yuki Hirata, Hiroki Akasaka and Naoto Ohtake        Materials 14 (2021) 2300
20.   Deposition of graphene–copper composite film by cold spray from particles with graphene grown on copper particles        Jongbeom Choi, Nana Okimura, Takatoshi Yamada, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Diamond & Related Materials 116 (2021) 10838419.   Structural and Mechanical Properties of a-BCN Films prepared by Arc-Sputtering Hybrid Process         Yuki Hirata, Ryotaro Takeuchi, Hiroyuki Taniguchi, Masao Kwagoe, Yoshinao Iwamoto, Mikito Yoshizato, Hiroki Akasaka, Naoto Ohtake        Materials 14 (2021) 71918.   Deposition of High-Density Carbon Nanotube-Containing Nickel-Based Composite Films by Low-Pressure Cold Spray        Jongbeom Choi, Wataru Nakayama, Nana Okimura, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Journal of Thermal Spray Technology 29 (2020) 190217.   Metal Matrix Composites Using Diamond-like Carbon-Coated Particles Fabricated by Cold Spray Technique        Nana Okimura, Jongbeom Choi, Wataru Nakayama, Nobuhisa Ata, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka         Journal of Thermal Spray Technology 29 (2020) 166016.   Using Textured-DLC Coating to Improve the Wear Resistance of Stainless Steel Plate Under Dust-Containing Lubricant Condition         Takuya Osawa Makoto Matsuo, Yuya Eyama, Hiroshi Yamamoto, Shinji Tanaka, Masao Kikuchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake        International Journal of Automation Technology 14 (2020) 9915.   Thermal decomposition and structural variation by heating on hydrogenated amorphous carbon films        H. Akasaka, Sarayut Tumee, Ukit Rittihong, M. Tomidokoro, Chanan Euaruksakul, S. Norizuki, Ratchadaporn Supruangnet, Hideki Nakajima, Yuki Hirata, N. Ohtake        Diamond & Related Materials 101 (2019) 1060914.   Preparation of DLC films on inner surfaces of metal tubes by nanopulse plasma CVD        Yoshinao Iwamoto, Keitaro Takenami, Ryota Takamura, Masaki Inoue, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake        Surface and Coating Technology 380 (2019) 12506213.   Macroscopic tribological properties of thick concentrated polymer brush on rough steel under lubrication with ionic liquid        Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Ken Nakano, Yoshinobu Tsujii, Shinya Sasaki        Journal Tribologi 20 (2019) 97-11312.   Effect of precursor gas on the structure and mechanical properties of hydrogenated amorphous carbon films deposited on a trench sidewall        Yuki Hirata, Kanju Kitamura, Takumi Ishikawa, Junho Choi        Journal of Applied Physics 625 (2019) 06530611.   Analysis of microstructure and surface morphology of a-C:H films deposited on a trench target        Yuki Hirata, Takumi Ishikawa, Junho Choi, Shinya Sasaki        Diamond & Related Materials 83 (2018) 1-7
10.   Effect of Ar+ ion assist on the properties of a-C:H films deposited on a trench         Yuki Hirata, Koeki Onishi, Junho Choi        Thin Solid Films 631 (2017) 57-63  9.   Structure and mechanical properties of a-C:H films deposited on a three-dimensional target: Comparative study on target scale and aspect ratio        Yuki Hirata, Junho Choi        Journal of Physics D: Appl. Phys. 50 (2017) 155204 1-9  8.   In Situ Raman Observation of the Graphitization Process of taC under Boundary Lubrication in Poly-Alpha-Olefin with an Organic Friction Modifier        Hikaru Okubo, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki        Tribology Online 12 (2017) 229-237  7.   Effects of Molecular Structure of Zinc Dialkyldithiophosphates on Tribological Properties of a a-C:H Film under Boundary Lubrication        Hikaru Okubo, Seiya Watanabe, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki        Tribology Online 12 (2017) 221-228  6.   Effects of Si particles of Al-Si alloys on frictional properties of a-C:H films/Al-Si alloys tribopairs under lubrication with fully formulated oil         Hikaru Okubo, Yuki Noda, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki        Transactions of the JSME (in Japanese) 83 (2017) 1-12  5.   Deposition of a-C:H films on inner surface of high-aspect-ratio microchannel        Yuki Hirata, Junho Choi        Journal of Applied Physics 120 (2016) 065305 1-7  4.   Deposition of a-C:H Films on a Nanotrench Pattern by Bipolar PBII&D        Yuki Hirata, Yuya Nakahara, Keisuke Nagato, Junho Choi        Journal of Physics D: Appl. Phys. 49 (2016) 245303 1-10  3.   Microstructure of a-C:H film prepared on micro trench and analysis of ions and radicals behavior        Yuki Hirata, Junho Choi        Journal of Applied Physics 118 (2015) 08305 1-9  2.   DLC coating on a trench-shaped target by bipolar PBII        Yuki Hirata, Junho Choi, Takahisa Kato        International Journal of Refractory Metal and Hard Materials 49 (2014) 392-399  1.   Study of DLC Coating to the Trench-Shaped Pattern by Bipolar PBII (バイポーラPBII法によるトレンチ形状物へのDLC成膜)        Yuki Hirata, Wonsoon Park, Junho Choi, Takahisa Kato        Journal of Japanese Society of Tribologists (in Japanese) 58 (2013) 841-847

International Conference Proceedings

－Refereed


15.   3D coating of ta-C films using FCVA method (The mechaincal properties of ta-C films deposited on the sidewall)        Yuto Tameno, Takumi Ishikawa, Toyohiro Kato, Kotaro Kawai, Hiroki Akasaka, Yuki Hirata, Naoto Ohtake, Hiroshige Matsuoka        Proceedings of 2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (2022)14.   Study on the surface properties of ta-C films deposited by FCVA method on the trench-shaped target        Hayata Fujimoto, Takumi Ishikawa, Kotaro Kawai, Toyohiro Kato, Hiroki Akasaka, Yuki Hirata, Naoto Ohtake, Hiroshige Matsuoka        Proceedings of 2022 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (2022)13.   Precision Coating of ta-C Films on Quartz Surfaces          Kotaro Kawai, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake         Proceedings of International Conference on Leading Edge Manufacturing/Materials and Processing12.   Wear Resistant DLC Coatings for Soft Metallic Materials         Takanori Yamaki, Takuya Osawa, Makoto Matsuo, Hiroki Akasaka, Shinji Tanaka, Masao Kikuchi, Yuki Hirata, Naoto Ohtake, Hiroshi Yamamoto         Proceedings of International Conference on Leading Edge Manufacturing/Materials and Processing11.   Physical Vapor Deposition Growth of Few-Atomic Layered Hexagonal Boron Nitride Nanosheets        Yuki Hirata, Mikito Yoshizato, Hiroki Akasaka, Naoto Ohtake        The 12th Asian Workshop on Micro/Nano Forming Technology, Tokyo, Japan, 2019. 8
10.   Evaluation of Structural and Mechanical Properties of a-BCN Films Deposited by PVD         Ryotaro Takeuchi, Yoshinal Iwamoto, Masao Kawagoe, Hiroyuki Taniguchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake        The 12th Asian Workshop on Micro/Nano Forming Technology, Tokyo, Japan, 2019. 8 9.   EVALUATION OF STRUCTURAL AND MECHANICAL PROPERTIES OF 3-DIMENSIONALY COATED a-C:H FILMS        Yuki Hirata, Takumi Ishikawa, Junho Choi       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 8.   FABRICATION OF ANTI-STICKING DIAMOND-LIKE CARBON COATINGS        Jun Enomoto, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 7.   Deposition of DLC films onto inner wall of metal tubes by nanopulse plasma CVD       Keitaro Takenami, Ryota Takamura, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 6.   Structure and Electrical Condition Characteristics in Hydrogenated Amorphous Carbon Films       Masashi Tomidokoro, Sarayut Tunmee, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 5.   Tribological Properties of A-BCN:H on Ball Against DLC Films in High Humidity Air       Keisuke Suzuki, Tetsuya Yamamoto, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 4.   Effects of Deposition Condition of A-BCN:H Films from Tri-Methyl-Borazine on True Densities       Saaya Matsubara, Tetsuya Yamamoto, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 3.   DEPOSITION OF a-BCN FILMS AND EVALUATION OF ITS MECHANICAL PROPERTIES       Hiroyuki Taniguchi, Yoshinao Iwamoto, Masao Kawagoe, Ryotaro Takeuchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 2.   Steel Coating Deposited by Cold Spray Method From Steel Particles       Wataru Nakayama, Nobuhisa Ata, Nana Okimura, Satoshi Momozono, Yuki Hirata, Naoto Ohtake, Hiroki Akasaka       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018) 1.   DESIGN OF DIAMOND-LIKE CARBON COATINGS FOR SEVERE ENVIRONMENT USE       Takuya Osawa, Yuya Eyama, Makoto Matsuo, Hiroshi Yamamoto, Shinji Tanaka, Masao Kikuchi, Yuki Hirata, Hiroki Akasaka, Naoto Ohtake       Proceedings of The 5th Asian Symposium on Material and Processing 2018 (2018)

－non-Refereed


 9.    Effects Of Laser Irradiation Conditions On Mechanical Properties By Selective Laser Melting         Yuji Kusaki, Yuki Hirata, Shinya Sasaki        Proceedings of Euro PM 2017 congress & Exhibition (2017) 8.    Generation of friction anisotropy by surface texturing under boundary lubrication        Shota Ito, Yuki Hirata, Shinya Sasaki        Proceedings of 6th World Tribology Congress (2017) 7.    Fundamental and Tribological Properties of Thick CPB        Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Tomoya Fujimori, Ken Nakano, Yoshinobu Tsujii, Shinya Sasaki        Proceedings of 6th World Tribology Congress (2017) 6.    Lubricating property of cyanobased ionic liquids against tetrahedral amorphous carbon film        Shohei Kawada, Seiya Watanabe, Yuki Hirata, Shinya Sasaki        Proceedings of 6th European Conference on Tribology (2017) 5.    In situ Raman observation of structural transformation of diamond-like carbon films lubricated with MoDTC solution        Hikaru Okubo, Chiharu Tadokoro, Yuki Hirata, Shinya Sasaki        Proceedings of 6th European Conference on Tribology (2017) 4.    Fundamental and tribological properties of thick CPB        Keisuke Sato, Hikaru Okubo, Yuki Hirata, Chiharu Tadokoro, Tomoya Fujimori, Ken Nakano, Yoshinobu Tsujii, Braham Prakash, Shinya Sasaki        Proceedings of 6th European Conference on Tribology (2017) 3.    Structural and Mechanical Properties of Amorphous Carbon Films Deposited on the Micro-trench Patterns by Bipolar PBII and Plasma Analysis        Yuki Hirata, Junho Choi        Proceedings of International Tribology Conference, Tokyo 2015 (2015) 2.    Amorphous Carbon Film as a Mold Release Layer for Nanoimprint Lithography        Yuki Hirata, Yuya Nakahara, Keisuke Nagato, Takahisa Kato, Junho Choi        Proceedings of International Tribology Conference, Tokyo 2015 (2015) 1.    Analysis of microstructure and surface morphology of a-C:H films deposited on a trench target        Yuki Hirata, Takahisa Kato, Junho Choi        Proceedings of 10th International Conference on the Science of Hard Materials (2014)

Books and Other Publications


  8.    PECVDおよびFCVA成膜法による三次元部材へのDLC成膜と特性評価        為野悠人、平田祐樹        メカニカルサーフテック (2023) 24 7.    焼付きを防止したダイヤモンド状炭素膜コーティング        李裕程，榎本隼，平田祐樹，赤坂大樹，大竹尚登        セラミックデータブック2022/23 50 (2022) 130 6.    アモルファス炭窒化ホウ素膜の構造および機械的特性評価と体系化        平田祐樹        Ceramic Data Book (in Japanese) 49 (2021) 112 5.    東京工業大学未来産業技術研究所創形科学研究室        平田祐樹        ニューダイヤモンド 143 (2021) 38-39 4.    バイポーラPBII法による複雑3次元形状物へのDLC成膜        平田祐樹        金属 91 (2021) 23-30 3.    日本のモノづくり再興Part2 -日本機械学会の役割-        平田祐樹        日本機械学会誌 124 (2021) 2.    「年中夢求（年中無休）」の日々を過ごして        平田祐樹        ニューダイヤモンド 137 (2020) 39 1.    Tribological Performance of Cyano-based Ionic Liquids as Functional Fluid         Shohei Kawada, Seiya Watanabe, Yuki Hirata, Chiharu Tadokoro, Shinya Sasaki        Surfactants in Tribology Volume 6 (2019) 3-16