劉 暁旭 (リュウ ギョウギョク)

RYU Gyogyoku

写真a

所属学科・専攻等

電気・機械工学教育類 / 機械工学分野
電気・機械工学専攻 / 機械工学分野

職名

助教

研究分野・キーワード

トライボロジー,切削

プロフィール

中国の東方地方出身,名大博士卒業,今名工大の助教,趣味は猫ちゃん

出身大学院

  • 2012年08月
    -
    2015年07月

    清華大学  工学研究科  環境工学修士課程  修了

取得学位

  • 名古屋大学 -  博士(工学)

  • 清華大学 -  修士(工学)

所属学会・委員会

  •  
     
     

    日本機械学会

  •  
     
     

    日本トライボロジー学会

  •  
     
     

    日本精密工学会

専門分野(科研費分類)

  • 機械材料・材料力学

  • 設計工学・機械機能要素・トライボロジー

  • 生産工学・加工学

 

研究経歴

  • IBA-FAD法によるta-CNx膜の高耐摩耗性発現メカニズムの解明

    機関内共同研究   科学技術振興調整費による生活・社会基盤研究  

    研究期間:  2015年10月  -  2018年09月

論文

  • Tribological properties of ta-CNx coating sliding against steel and sapphire in unlubricated condition

    Xiaoxu Liu, Noritsugu Umehara, Takayuki Tokoroyama, Motoyuki Murashima

    Tribology International ( Elsevier )  131   102 - 111   2018年10月  [査読有り]

    研究論文(学術雑誌)   単著

  • Effect of oil temperature and counterpart material on the wear mechanism of ta-CNx coating under base oil lubrication

    Xiaoxu Liu, Ryo Yamaguchi, Noritsugu Umehara, Motoyuki Murashima, Takayuki Tokoroyama

    Wear ( Elsevier )  390   312 - 321   2017年09月  [査読有り]

    研究論文(学術雑誌)   共著

    Tetrahedral amorphous carbon nitride (ta-CNx), as an emerging and promising diamond-like carbon (DLC), has better mechanical properties than amorphous carbon nitride (a-CNx) to ensure the sufficient durability, and overcomes the limit of high internal stress of tetrahedral amorphous carbon (ta-C), which makes ta-CNx coatings ofgreatworthofresearchforthetribologicalandmechanicalapplications.Inthisstudy,wepresenttheeffectsof oil temperature and counterpart material on the wear behavior of ta-CNx coatings under base-oil lubrication, andfurtherclarifythewearmechanism.ta-Candta-CNxcoatingswithN/Catomicratioof2.2%and11.0%were deposited by an ion beam assisted filtered arc deposition (IBA-FAD) system, and the tribological tests were performed using a ball-on-disk tribo-tester with ta-C and ta-CNx coated steel ball sliding against uncoated disk under base-oil lubrication. The results show that nitrogen doping tends to decrease the hardness and Young's modulus by reducing the sp3 structure. Sliding against steel disk, with increase of sliding distance ta-CNx shows obviously distinct wear behavior compared to ta-C, much more slowly increasing wear volume, exhibiting excellent wear resistance. Increasing oil temperature from room temperature to 120 °C results in rising wear rates of all the three coatings, with totally worn out ta-C and much lower wear rate of ta-CNx, which decreases by more than half than ta-C for high nitrogen content ta-CNx. However, as the counterpart material changed from steel to alumina, the wear rate presents oppositely increasing tendency with N/C ratio, probably caused by the change of deciding factor to hardness in this mechanical wear. It is found that the wear performance of ta-CNx coating has a clear dependence on the oil temperature and counterpart material. Based on the results, the better wear resistance of softer ta-CNx against steel could be attributed to the less tribo-chemical wear between carbon and iron, due to the nitrogen doping partial passivation effect.

  • Clarification of high wear resistance mechanism of ta-CNx coating under poly alpha-olefin (PAO) lubrication

    Xiaoxu Liu RyoYamaguchi NoritsuguUmehara Xingrui Deng Hiroyuki Kousaka Motoyuki Murashima

    Tribology International ( Elsevier )  105   193 - 200   2016年10月  [査読有り]

    研究論文(学術雑誌)   共著

研究発表

  • Clarification of high wear resistance of ta-CNx coating under base-oil lubrication

    Liu, X., Umehara, N., Tokoroyama, T, Murashima, M.

    トライボロジー会議2018秋 伊勢  2018年11月  -  2018年11月  日本トライボロジー学会

  • Tribological properties of ta-CNx coating under different oil temperatures and counterpart materials in base oil

    Liu, X., Umehara, N., Tokoroyama, T, Murashima, M.

    6th World Tribology Congress - WTC  (Beijing (China))  2017年09月  -  2017年09月 

  • Wear behavior of tetrahedral amorphous carbon nitride under poly alpha-olefin (PAO) lubrication

    Liu, X., Yamaguchi, R., Umehara, N., Murashima, M,

    4th International Conference on Manufacturing, Machine Design and Tribology - ICMDT  (Jeju (Korea))  2017年04月  -  2017年04月  JSME, KSME

  • Mechanical and tribological properties of ta-CNx coatings prepared by filtered arc deposition

    Liu, X., Umehara, N., Deng, X., Kousaka,H,

    5th International Conference on INTEGRITY RELIABILITY FAILURE - IRF  (Porto (Portugal))  2016年07月  -  2016年07月