ZHAO Fei1,4*, PANG Xianjuan2,4, DU Sanming1,4, LIU Jingchao1,4, NIU Yongping2,4, LI Hongxuan3, ZHANG Yongzhen1,4
(1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; 2.School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang 471003, China 3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; 4. Henan Key Laboratory of Materials Tribology, Luoyang 471003, China)
Abstract: (MoSx)-doped diamond-like carbon (a-C:H:Mo:S) films were prepared using a hybrid radio frequency plasma-enhanced chemical vapor deposition and unbalanced magnetron sputtering deposition technique. Their composition, surface topography, nanohardness and thermal stability were investigated. Friction and wear tests at different sliding speed were conducted on a QG-700 tribometer. The friction and wear mechanism was briefly discussed based on the characterizations of frictional surfaces by optical microscope, scanning electron microscopy and energy dispersive spectrometer. The results reveal that the friction coefficient first increases and then decreases with increasing sliding speed, while the wear rate just varies oppositely. The increase in friction coefficient is due to the aggravated surface oxidization in high-humidity environment, but the decrease is most likely due to the friction-induced graphitization.
Key words: DLC film; doping; friction and wear; speed
E-mail: feizhao@mail.haust.edu.cn
Tribology, Vol. 32, Issue 5, 2012, 524~530
