KEIO RESEARCHERS INFORMATION SYSTEM

Profile Summary 【 Display / hide 】

Profile Summary 【 Display / hide 】

• To create new products with high added value, we are conducting R&D on high-accuracy, high-efficiency, resource-saving manufacturing technologies through micro/nanometer-scale material removal, deformation, and property control. Our recent research focuses on ultra-precision mechanical fabrication, micro-nano forming/imprinting, micro electrical machining, laser machining, laser recovery, and laser Raman spectroscopy.

Career 【 Display / hide 】

Career 【 Display / hide 】

• 2000.04

  -

  2001.09

  Research Associate, Tohoku University, Graduate School of Engineering

• 2001.10

  -

  2005.03

  Associate Professor, Kitami Institute of Technology

• 2005.04

  -

  2007.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2007.04

  -

  2012.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2008.02

  -

  2008.04

  Sydney University, Japan-Australia Exchange Researcher

display all >>

Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 1991.07

  Jilin University, Faculty of Engineering, Department of Mechanical Engineering

  University, Graduated

• 1994.03

  Jilin University, Graduate School, Division of Engineering, Department of Mechanical Engineering

  Graduate School, Completed, Master's course

• 1996.01

  Tsinghua University, Graduate School, Division of Engineering, Department of Precision Instruments and Mechanology

  Graduate School, Withdrawal before completion, Doctoral course

• 2000.03

  Tohoku University, Graduate School, Division of Engineering, Department of Mechatronics and Precision Engineering

  Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Ph.D., Tohoku University, Coursework, 2000.03

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Precision Engineering/Mechanical manufacturing)

• Nanotechnology/Materials / Material processing and microstructure control (Material Processing/Treatment)

• Nanotechnology/Materials / Nano/micro-systems (Micro/Nanodevice)

• Nanotechnology/Materials / Composite materials and interfaces (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Ultraprecision machining

• Micro/nano manufacturing

• Laser processing

• Electrical discharge machining

• Nanomechanics

Books 【 Display / hide 】

Books 【 Display / hide 】

• Advanced Ceramic Coatings: Fundamentals, Manufacturing, and Classification, R. K. Gupta, A. Motallebzadeh, S. Kakooei, T. A. Nguyen, A. Behera (eds.)

  P. J. Liew, J. Yan, C. Y. Yap, Elsevier B. V., 2023.06

  Scope: Chapter 19: Electrical discharge coating with quarry dust powder suspension,  Contact page： 433-460

• Multidisciplinary Science in Micro/Nanoscale Manufacturing

  J. Yan (Guest editor), Elsevier B.V., 2020.12

  Scope: International Journal of Machine Tools and Manufacture, Volume 159 (Special Issue)

• Micro and Nanoscale Laser Processing of Hard Brittle Materials

  J. Yan and N. Takayama, Elsevier B.V., 2019.11,  Page： 242

  Scope: 1-242

• Recent Developments of Silicon Anodes for Lithium Ion Batteries

  J. Yan, CMC Publishing CO., LTD. , 2019.11,  Page： 251

  Scope: Chapter 3: Micro Pillar Generation by Laser Irradiation on Waste Silicon Powder and Its Electrode Characteristics, 20-33

• Micro and Nano Fabrication Technology

  J. Yan (ed.), Springer Nature Singapore Pte Ltd., 2018.05

  Scope: 1-959

display all >>

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Surface quality and mechanical property evolution of laser nitrided Zr-based metallic glass induced by laser shock flattening

  Huang H., Xu P., Liu B., An H., Qian Y., Yan J.

  Vacuum （Vacuum)  224 2024.06

  ISSN  0042207X

  　View Summary

  Laser nitriding is an effective modification technique to improve the comprehensive mechanical properties of metallic glasses (MGs). However, numerous micro-defects, such as pores and humps, usually appear on the laser-nitriding-treated (LNed) MG surface, and therefore additional post-treatment is required. Herein, laser shock processing was implemented to flatten the LNed MG and as well modify its surface mechanical property. The dependence of the laser shock flattening process on the laser energy density was investigated. The results revealed that the surface micro-defects on the LNed MG were significantly reduced after laser shock flattening, and accordingly, the surface roughness (Sa) was decreased, with a maximum reduction of 61.87% (from 0.48 to 0.183 μm) achieved at a relatively high laser energy density of 178.3 J/cm2. Furthermore, nanoindentation measurements indicated that although the surface hardness of the LNed MG was decreased after laser shock flattening, it was still higher than that of the as-cast MG.

  • Access to Document (DOI)

• Investigation of failure modes and material structural responses of nanographite coatings on single-crystal silicon by nanoscratching

  Brüssel F., Huang W., Yan J.

  Tribology International （Tribology International)  193 2024.05

  ISSN  0301679X

  　View Summary

  The failure modes of a nanographite-on-silicon system and the effects of the coating on the load-induced phase transformation of the silicon substrate were investigated using a series of nanoscratching tests with a spherical diamond indenter. The critical normal load for the failure of the nanographite coating was determined based on the thickness of the coating. When the load increased beyond the critical point, cracks, press spallation, and lift spallation were observed, and the silicon substrate underwent a phase transformation from the original crystalline phase to a mixture of amorphous, Si-III and Si-XII phases. For a thin coating, the silicon substrate was free of phase transformation owing to the coating protection. These findings provide guidance for glass molding and other applications.

  • Access to Document (DOI)

• Simultaneous flattening and hardening of laser shock peened Zr-based metallic glass surface by nanosecond laser irradiation in a flowing nitrogen atmosphere

  Qian Y., Liu B., Hong J., Jiang M., Zhang Z., Zhang L., Huang H., Yan J.

  Journal of Materials Processing Technology （Journal of Materials Processing Technology)  326 2024.05

  ISSN  09240136

  　View Summary

  Laser shock peening (LSP) is an ideal surface modification technique which has been extensively applied to improve the room-temperature plasticity of metallic glasses (MGs) by generating extra-deep compressive residual stress region and increasing the free volume content. Nevertheless, after LSP treatment, the surface quality and hardness of MGs are usually impaired simultaneously, which hinders their applications as structural and functional materials. In the current study, an attempt was made to achieve simultaneous flattening and hardening of LSP treated (LSPed) Zr-based MG by nanosecond laser irradiation in a flowing nitrogen atmosphere. The effects of laser power level on the macro- and micro-morphology, chemical composition, surface hardness, and surface roughness (Sa) of the laser-irradiated LSPed MG were comprehensively investigated. It was found that the minor surface defects of the LSPed MGs could be effectively reduced by nanosecond laser irradiation under appropriate laser irradiation parameters, and accordingly, the surface quality was improved (with a maximum reduction in surface roughness (Sa) by 86.3%). Furthermore, the nanoindentation test results indicated that nanosecond laser irradiation at a relatively high laser power of 15.6 W resulted in an impressive improvement (173.9%) in surface hardness of the LSPed MG, which could be attributed to the introduction of hard nitrided phases mainly consisting of Zr3N4. This study provides an insightful understanding of the microstructure changes and surface characteristics of the LSPed MGs after nanosecond laser irradiation in a flowing nitrogen atmosphere, which paves the way for improving the applicability of MGs as structural and functional materials.

  • Access to Document (DOI)

• Effect of dopant concentration on femtosecond pulsed laser irradiation of yttria-stabilized zirconia for generating nanopores

  Yamamuro Y., Shimoyama T., Nagata H., Yan J.

  Journal of Alloys and Compounds （Journal of Alloys and Compounds)  980 2024.04

  ISSN  09258388

  　View Summary

  Yttria-stabilized zirconia (YSZ) is a fine ceramics material that has been applied to dental implants and mechanical components. As YSZ is a hard, brittle, and chemically stable material, that undergoes phase transformation during mechanical loading, it is difficult to fabricate nanostructures using mechanical processing methods. In this study, a surface structuring method using a femtosecond pulsed laser was proposed, which is effective in suppressing the mechanical loading-induced phase transformation. As the material properties of YSZ vary with the concentration of yttria dopant, polycrystalline zirconia samples with different yttria concentrations (2, 3, 5, and 8 mol%) were used to investigate the effect of yttria concentrations on laser processing characteristics for nanostructuring. At all concentrations, nanopore generation in the surface grain was achieved by laser irradiation near the ablation threshold. In addition, there was no significant change in the crystal structure before and after laser irradiation, and no damage to the bulk occurred. At 2 mol%, intergranular cracks were generated around the pores. By increasing the dopant level to 5 mol%, the lens effect of the crystal grains became stronger due to enhanced grain growth, and the diameter and number of pores increased. In addition, pores formed preferentially on smaller grains at 5 mol%. However, for YSZ with 8 mol%, the pore formation phenomenon was different from that in the lower dopant level, as the area near the grain boundary was preferentially ablated, and microcracks formation and exfoliation of the surface also occurred. These results contribute to a deeper understanding of the laser ablation characteristics of zirconia with different dopant levels and to the development of surface structuring methods for fine ceramics materials.

  • Access to Document (DOI)

• Change in Material Structure upon Laser Irradiation of Mixed Target of Si Grinding Waste and Graphite Powder

  Kanon MINAMI, Kyosuke KOBINATA and Jiwang YAN

  Journal of The Japan Scoiety of Electrical Machining Engineers 58 （ 147 ） 3 - 11 2024.03

  Research paper (scientific journal), Joint Work, Last author, Accepted

display all >>

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• Laser polishing technologies for additive-manufactured metal products

  J. Yan

  Journal of the Japan Society for Abrasive Technology 67 ( 8 ) 440 - 443 2023.08

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

• Ultraprecision ductile mode machining of hard brittle materials

  J. Yan

  Journal of the Japan Society of Mechanical Engineers 125 ( 1247 ) 11 - 14 2022.10

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

• Ultrasonic vibration-assisted grinding of carbon-based difficult-to-cut materials

  J. Yan

  Journal of the Japan Society for Precision Engineering 88 ( 7 ) 541 - 545 2022.07

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

• Electrochemical Machining on an EDM Machine for Fine Finishing of Micro Grooves

  J. Yan

  Die and Mould Technology 37 ( 4 ) 14 - 17 2022.04

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work, Lead author, Corresponding author

• EDM/Grinding Hybrid Machining of Single-crystal SiC using Poly-crystal Diamond Tools

  J. Yan

  Journal of the Japan Society for Abrasive Technology 65 ( 12 ) 650 - 653 2021.12

  Article, review, commentary, editorial, etc. (scientific journal), Single Work

display all >>

Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• Laser-induced periodic surface structures generation on single-crystal 4H-SiC by femtosecond pulsed infrared laser irradiation

  T. Meshram, J. Yan

  The 19th International Conference on Precision Engineering (ICPE2022) (Singapore) , 

  2022.11

  -

  2022.12

  , 

  Oral presentation (general)

• Cutting of Microgrooves on Ferrous Metal by Using Laser-Processed cBN Tools

  D. Kitagawa, T. Meshram, J. Yan

  The 19th International Conference on Precision Engineering (ICPE2022) (Singapore) , 

  2022.11

  -

  2022.12

  , 

  Oral presentation (general)

• Effect of dopant concentration on femtosecond pulsed laser processing characteristics of yttria-stabilized zirconia

  Y. Yamamuro, T. Shimoyama, J. Yan

  The 19th International Conference on Precision Engineering (ICPE2022) (Singapore) , 

  2022.11

  -

  2022.12

  , 

  Oral presentation (general)

• A Novel Calibration Method of Machining Misalignment in FTS-Based Diamond Turning

  S. Tanikawa, J. Yan

  The 9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN 2022) (Singapore) , 

  2022.11

  , 

  Oral presentation (general)

• Fabrication of optical surfaces on polymethyl methacrylate by ultra-precision diamond turning

  M. Shimizu, J. Yan

  The 9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN 2022) (Singapore) , 

  2022.11

  , 

  Oral presentation (general)

display all >>

Awards 【 Display / hide 】

Awards 【 Display / hide 】

• JSPE Best Paper Award

  Lin Zhang, Allen Yi, J. Yan, 2023.03, The Japan Society for Precision Engineering, Flexible fabrication of Fresnel micro-lens array by off-spindle-axis diamond turning and precision glass molding

  Type of Award： Award from Japanese society, conference, symposium, etc.

• 2022 IJEM Best Paper Award

  Y. Sato, J. Yan, 2023.03, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

  Type of Award： Honored in official journal of a scientific society, scientific journal

• Machine Tool Technology Promotion Award

  S. Kasai, T. Sodetai, J. Yan, 2021.06, 工作機械技術振興財団, 炭素拡散反応を用いた形彫り放電加工による多結晶ダイヤモンドの３次元形状創製

  Type of Award： Award from publisher, newspaper, foundation, etc.

• Machine Tool Technology Promotion Award

  K. Nagayama, J. Yan, 2021.06, 工作機械技術振興財団, Measurement and Compensation of Tool Contour Error Using White Light Interferometry for Ultra-Precision Diamond Turning of Freeform Surfaces

  Type of Award： Award from publisher, newspaper, foundation, etc.

• JSME Medal for Outstanding Paper

  T. Terabayashi, J. Yan, 2021.04, The Japan Society of Mechanical Engineers, Ultra-precision cutting of roll molds having two-directional wavy microstructures

  Type of Award： Award from Japanese society, conference, symposium, etc.

display all >>

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• ULTRAPRECISION MACHINING AND METROLOGY

  2024

• SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

  2024

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2024

• INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

  2024

• INDEPENDENT STUDIES IN MECHANICAL ENGINEERING

  2024

display all >>

Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• The Japan Society of Mechanical Engineers, 

  1997.04

  -

  Present

• The Japan Society for Precision Engineering, 

  1997.04

  -

  Present

• The Japan Society for Abrasive Technology, 

  2000.04

  -

  Present

• Japan Society for Applied Physics (JSAP), 

  2004.04

  -

  Present

• Japan Laser Processing Society (JLPS), 

  2009.01

  -

  Present

display all >>

Committee Experiences 【 Display / hide 】

Committee Experiences 【 Display / hide 】

• 2022.05

  -

  Present

  Director, Japan Society of Laser Technology (JSLT)

• 2022.03

  -

  Present

  Director, Executive Director, Chairman of Publication Sector, Chairman of Journal Review Board, Japan Society of Precision Engineering (JSPE)

• 2019.04

  -

  2022.03

  Journal Editorial Commitee Member, 日本機械学会

• 2019.01

  -

  Present

  Editorial Board Member, International Journal of Extreme Manufacturing

• 2018.04

  -

  Present

  Editorial Board Member, Journal of Micromanufacturing

display all >>