Running-in behavior of a H‒DLC/Al_(2)O_(3) pair at the nanoscale

查看全文 作　　者：Pengfei [1]SHI;Junhui [1]SUN;Yunhai [1]LIU;Bin [2]ZHANG;Junyan [2]ZHANG;Lei [1]CHEN;Linmao [1]QIAN

机构地区：[1]Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;[2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Friction》索引2021年第9卷第6期,共10页

基　　金：The authors are grateful for the financial support from the National Natural Science Foundation of China(51875486 and 51991373);Sichuan Science and Technology Program(2019YFH0098). 摘　　要：Diamond-like carbon(DLC)film has been developed as an extremely effective lubricant to reduce energy dissipation;however,most films should undergo running-in to achieve a super-low friction state.In this study,the running-in behaviors of an H–DLC/Al_(2)O_(3) pair were investigated through a controllable single-asperity contact study using an atomic force microscope.This study presents direct evidence that illustrates the role of transfer layer formation and oxide layer removal in the friction reduction during running-in.After 200 sliding cycles,a thin transfer layer was formed on the Al2O3 tip.Compared with a clean tip,this modified tip showed a significantly lower adhesion force and friction force on the original H–DLC film,which confirmed the contribution of the transfer layer formation in the friction reduction during running-in.It was also found that the friction coefficient of the H–DLC/Al_(2)O_(3) pair decreased linearly as the oxygen concentration of the H–DLC substrate surface decreased.This phenomenon can be explained by a change in the contact surface from an oxygen termination with strong hydrogen bond interactions to a hydrogen termination with weak van der Waals interactions.These results provide new insights that quantitatively reveal the running-in mechanism at the nanoscale,which may help with the design optimization of DLC films for different environmental applications. 关键词：hydrogenated diamond-like carbon(H–DLC)film RUNNING-IN NANOSCALE oxide film transfer layer

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Running-in behavior of a H‒DLC/Al_(2)O_(3) pair at the nanoscale

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