Influence of lubricious oxides formation on the tribological behavior of Mo-V-Cu-N coatings deposited by HIPIMS

SURFACE & COATINGS TECHNOLOGY

卷:358

Article

Mei, Haijuan^1,2  Luo, Quanshun²  Huang, Xueli¹  Ding, Ji Cheng³  Zhang, Teng Fei¹  Wang, Qimin¹ 

[1] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou, Guangdong, Peoples R China

[2] Sheffield Hallam Univ, Mat & Engn Res Inst, Sheffield S1 1WB, S Yorkshire, England

[3] Pusan Natl Univ, Sch Convergence Sci, Busan 609735, South Korea

关键词: Mo-V-Cu-N;    Low friction;    Lubricious oxides;    Tribological behavior;   

DOI  :  10.1016/j.surfcoat.2018.12.033

来源: Elsevier

【 摘 要 】

The variations of microstructure, mechanical properties, and oxidation behavior of Mo-V-Cu-N coatings are directly correlated to the chemical compositions, which significantly affects their tribological behavior. The aim of this work was to characterize Mo-V-Cu-N coatings with different chemical compositions deposited by high power impulse magnetron sputtering (HIPIMS) using single Mo-V-Cu segmental target, and to investigate the correlations between the lubricative oxides formed on coating surfaces with the variation of tribological behavior at different temperatures. The oxidation of Mo-V-Cu-N coatings started at 400 degrees C with the lubrication oxides of Mo-O and Cu-Mo-O were formed, which led to the decrease in coefficients of friction and wear rates of the coatings. It was found that the rapid outward diffusion of Mo and Cu atoms took place preferentially at around the growth defects (e.g. microparticles and pores). The incorporation of V atoms into Mo-Cu-N coatings enhanced the oxidation resistance at temperatures below 400 degrees C. At 500 degrees C, all the fcc B1-MoN and VN phases disappeared due to the severe oxidation, and the V2O5 phase was first appeared. Even though a relatively low coefficient of friction was obtained at 500 degrees C, the wear resistance of Mo-V-Cu-N coatings was decreased due to the severe oxidation and loss of mechanical strength.

【 授权许可】

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