論文 - 閻　紀旺

Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings

Wang Q., Zhou F., Ma Q., Callisti M., Polcar T., Yan J.

Applied Surface Science （Applied Surface Science）  443   635 - 643 2018年03月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  01694332

　概要を見る

© 2018 Elsevier B.V. CrBC and CrBCN coatings with low and high B contents were deposited on 316L steel and Si wafers using an unbalanced magnetron sputtering system. Mechanical properties including hardness (H), elastic modulus (E) and fracture toughness (K Ic ) as well as residual stresses (σ) were quantified. A clear correlation between structural, mechanical and tribological properties of coatings was found. In particular, structural analyses indicated that N incorporation in CrBC coatings with high B content caused a significant structural evolution of the nanocomposite structure (crystalline grains embedded into an amorphous matrix) from nc-CrB 2 /(a-CrB x , a-BC x ) to nc-CrN/(a-BC x , a-BN). As a result, the hardness of CrBC coating with high B content decreased from 23.4 to 16.3 GPa but the fracture toughness was enhanced. Consequently, less cracks initiated on CrBCN coatings during tribological tests, which combined with the shielding effect of a-BN on wear debris, led to a low friction coefficient and wear rate.

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フッ化物ガラスの超精密切削

石塚 潤, 長澤 圭祐, 三神 政之, 閻 紀旺

砥粒加工学会誌 （社団法人 砥粒加工学会）  62 （ 2 ） 88 - 93 2018年02月

査読有り,  ISSN  0914-2703

　概要を見る

光学ガラスの超精密切削におけるダイヤモンド工具の摩耗は，ガラスの主成分であるSiO₂とダイヤモンドとの化学反応が1つの要因であると考えられる．本研究では，SiO₂を含有しないフッ化物ガラスを被削材として切削加工を試みた．その結果，SiO₂を含有する光学ガラスBK7に比べ，ダイヤモンド工具の刃先後退率が約1/22へと低減し，継続的な延性モード加工が可能となった．また，仕上げ面と切りくず生成そして工具損耗形態などの変化における切削条件の影響を調べた．さらに，本技術を利用してガラス非球面レンズの切削加工を試みた．

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Ultraprecision cutting of single-crystal calcium fluoride for fabricating micro flow cells

Komiya R., Kimura T., Nomura T., Kubo M., Yan J.

Journal of Advanced Mechanical Design, Systems and Manufacturing （Journal of Advanced Mechanical Design, Systems and Manufacturing）  12 （ 1 ） 17-00388, 1 - 13 2018年02月

研究論文（学術雑誌）, 共著, 査読有り

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© 2018 The Japan Society of Mechanical Engineers. Single-crystal infrared (IR) spectroscopy is a promising method for protein structure analysis, where a protein crystal sample is fixed in a micro flow cell. Single-crystal calcium fluoride (CaF2) is expected as the flow cell substrate material for its excellent optical property. However, CaF2 is a highly brittle material having strong anisotropy, thus is extremely difficult to machine. Up to date, there is no available literature on fabrication of CaF2 flow cells. In this study, micro flow cells of single-crystal CaF2 were fabricated by ultraprecision cutting technology. Fly cutting was conducted using a single-crystal diamond tool having straight edges to generate a depth-varying rectangle cross section for the flow cell. The effects of cutting direction, workpiece orientation, undeformed chip thickness and tool rake angle on cutting behavior were investigated. Based on experiments and analysis, optimal conditions for ductile machining of micro grooves in CaF2 were identified. As a result, a 10 μm deep CaF2 micro flow cell with surface roughness of 2.4 nmRa was successfully fabricated. Using the fabricated flow cell, IR spectroscopic analysis of a protein single crystal at room temperature was succeeded. This study demonstrated the effectiveness of ultraprecision cutting technology in CaF2 micro flow cell fabrication, which contributes to the IR analysis of protein, and in turn, the advance of life science.

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Nanometer-scale chip formation and surface integrity of pure titanium in diamond turning

Heidari M., Yan J.

International Journal of Advanced Manufacturing Technology （International Journal of Advanced Manufacturing Technology）  95 （ 1-4 ） 479 - 492 2018年02月

研究論文（学術雑誌）, 共著, 査読有り,  ISSN  02683768

　概要を見る

© 2017, Springer-Verlag London Ltd. Titanium is attracting great attentions in aerospace and medical applications where high surface quality plays an important role in improving the product performance. For developing nano-precision machining technology for titanium, clarification of the nanometer-scale chip formation mechanism is essential. In this study, the surface formation mechanism of pure titanium in ultraprecision cutting tests using single-crystal diamond tools was investigated. The results demonstrated that decreasing undeformed chip thickness from the micrometer scale down to the nanometer scale had profound impacts on the shear angle, specific cutting force, and chip morphology. Chip tearing phenomenon occurred when undeformed chip thickness is smaller than a critical value (~ 100 nm), which significantly affected the chip morphology and machined surface integrity. In nanometer-scale cutting, tool feed mark is no longer a major reason of surface roughness; instead, material plucking, debris, scratches, and chip adhesion influenced the surface integrity. The high pressure generated in the nanometer-scale cutting caused a hardness increase in workpiece material and promoted workpiece material adhesion to the tool surface, as well as tool wear.

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フッ化物ガラスの超精密切削 - 仕上げ面生成と工具損傷の基礎検討 -

石塚　潤，長澤圭祐，三神政之，閻 紀旺

砥粒加工学会誌 62 （ 2 ） 88 - 93 2018年02月

研究論文（学術雑誌）, 共著, 査読有り

極細線固定砥粒ダイヤモンドワイヤによる単結晶SiCの精密切断

鈴木孝彰，大槻俊紀，閻 紀旺

日本機械学会論文集 84 （ 857 ） 1 - 18 2018年01月

研究論文（学術雑誌）, 共著, 査読有り

Comparative study of phase transformation in single-crystal germanium during single and cyclic nanoindentation

K. Kosai, H. Huang, J. Yan

Crystals 7 （ 333 ） 1 - 11 2017年11月

研究論文（学術雑誌）, 共著, 査読有り

Fabrication of hexagonal microlens arrays on single-crystal silicon by tool-servo segment turning method

M. Mukaida, J. Yan

Micromachines 8 （ 323 ） 1 - 18 2017年11月

研究論文（学術雑誌）, 共著, 査読有り

An investigation on the crack resistance of CrN, CrBN and CrTiBN coatings via nanoindentation

Q. Wang, F. Zhou, Z. Zhou, L. K-Y Li, J. Yan

Vacuum 145   186 - 193 2017年10月

研究論文（学術雑誌）, 共著, 査読有り

Mechanisms of material removal and subsurface damage in fixed-abrasive diamond wire slicing of single-crystalline silicon

T. Suzuki, Y. Nishino, J. Yan

Precision Engineering 50   32 - 43 2017年09月

研究論文（学術雑誌）, 共著, 査読有り

Effect of surfactants and additives on electrical discharge machining of Reaction Bonded Silicon Carbide

M. R. A. Razak, P. J. Liew, N. I. S. Hussein, Q. Ahsan, J. Yan

ARPN Journal of Engineering and Applied Sciences 12 （ 14 ） 4334 - 4339 2017年09月

研究論文（学術雑誌）, 共著, 査読有り

Investigating shear band interaction in metallic glasses by adjacent nanoindentation

H. Huang, J. Yan

Materials Science & Engineering A 704   375 - 385 2017年08月

研究論文（学術雑誌）, 共著, 査読有り

純鉄金型を用いたプレス転写による単結晶ダイヤモンドへの微細形状創成

井本祐司, 閻 紀旺

精密工学会誌 83 （ 8 ） 770 - 774 2017年08月

研究論文（学術雑誌）, 共著, 査読有り

Laser Irradiation Responses of a Single-Crystal Diamond Produced by Different Crystal Growth Methods

N. Takayama, J. Yan

Applied Sciences 7 （ 815 ） 1 - 15 2017年08月

研究論文（学術雑誌）, 共著, 査読有り

A nanosecond time-resolved XFEL analysis of structural changes associated with CO release from cytochrome c oxidase

A. Shimada, M. Kubo, S. Baba, K. Yamashita, K. Hirata, G. Ueno, T. Nomura, T. Kimura, K. Shinzawa-Itoh, J. Baba, K. Hatano, Y. Eto, A. Miyamoto, H. Murakami, T. Kumasaka, S. Owada, K. Tono, M. Yabashi, Y. Yamaguchi, S. Yanagisawa, M. Sakaguchi, T. Ogura, R. Komiya, J. Yan, E. Yamashita, M. Yamamoto, H. Ago, S. Yoshikawa, T. Tsukihara

Science Advances 3 （ e1603042 ） 1 - 12 2017年07月

研究論文（学術雑誌）, 共著, 査読有り

Ultraprecision surface flattening of porous silicon by diamond turning

M. Heidari, J. Yan

Precision Engineering 49   262 - 277 2017年07月

研究論文（学術雑誌）, 共著, 査読有り

Fabrication of single-crystal silicon micro pillars on copper foils by nanosecond pulsed laser irradiation

J. Yan, J. Noguchi, Y. Terashi

CIRP Annals – Manufacturing Technology 66 （ 1 ） 253 - 256 2017年07月

研究論文（学術雑誌）, 共著, 査読有り

On the phase transformation of single-crystal 4H-SiC during nanoindentation

M. Matsumoto, H. Huang, H. Harada, K. Kakimoto,　J. Yan

Journal of Physics D: Applied Physics 50 （ 265303 ） 1 - 9 2017年06月

研究論文（学術雑誌）, 共著, 査読有り

Surface patterning of Zr-based metallic glass by laser irradiation induced selective thermoplastic extrusion in nitrogen gas

H. Hu, J. Yan

Journal of Micromechanics and Microengineering 27 （ 075007 ） 1 - 13 2017年06月

研究論文（学術雑誌）, 共著, 査読有り

Thermochemical Micro Imprinting of Single-crystal Diamond Surface Using a Nickel Mold under High-Pressure Conditions

Y. Imoto, J. Yan

Applied Surface Science 404   318 - 325 2017年05月

研究論文（学術雑誌）, 共著, 査読有り