Perspectives of the Friction Mechanism of Hydrogenated Diamond-Like Carbon Film in Air by Varying Sliding Velocity

被引:17
作者
Liu, Yunhai [1 ]
Zhang, Bin [2 ]
Chen, Lei [1 ,3 ]
Cao, Zhongyue [2 ]
Shi, Pengfei [1 ]
Liu, Jinwei [1 ]
Zhang, Junyan [2 ]
Qian, Linmao [1 ]
机构
[1] Southwest Jiaotong Univ, Tribol Res Inst, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China
[2] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China
[3] Henan Univ Sci & Technol, Natl United Engn Lab Adv Bearing Tribol, Luoyang 471023, Henan, Peoples R China
来源
COATINGS | 2018年 / 8卷 / 10期
基金
中国国家自然科学基金;
关键词
diamond-like carbon film; friction mechanism; transfer layer; surface passivation; sliding velocity; ULTRA-LOW FRICTION; DLC FILMS; TRIBOLOGICAL PERFORMANCE; HIGH-VACUUM; WEAR; BEHAVIOR; SUPERLUBRICITY; TEMPERATURE; COATINGS; GRAPHITIZATION;
D O I
10.3390/coatings8100331
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The purpose of the present work is to probe the friction mechanism of hydrogenated diamond-like carbon (H-DLC) film in air by varying sliding velocity (25-1000 mm/s). Friction tests of Al2O3 ball against H-DLC film were conducted with a rotational ball-on-disk tribometer. As the sliding velocity increases, both the friction coefficient and the surface wear of H-DLC film decrease, reach the minimum values, and then increase in the high sliding velocity region. Based on the observed results, three main friction mechanisms of H-DLC filmnamely graphitization mechanism, transfer layer mechanism, and passivation mechanismare discussed. Raman analysis indicates that the graphitization of worn surface on the H-DLC film has a negligible contribution to the variation of the friction coefficient and the surface wear. The origin of the sliding velocity dependence is due to the synergistic interaction between the graphitized transfer layer formation and the surface passivation. The present study will not only enrich the understanding of friction mechanism of H-DLC films in air, but will also help to promote their practical engineering applications.
引用
收藏
页数:10
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