| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Role of Surface Hydrogen Bonds in Determining the Friction Behaviors of Hydrogenated Diamond-like Carbon Films |
| WANG Cheng-Bing1**,SHI Jing1,GENG Zhong-Rong1,ZHANG Jun-Yan2 |
1National Engineering Research Center for Technology and Equipment of Green Coating, Lanzhou Jiaotong University, Lanzhou 730070
2State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 |
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| Cite this article: |
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WANG Cheng-Bing, SHI Jing, GENG Zhong-Rong et al 2012 Chin. Phys. Lett. 29 056201 |
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Abstract Friction behaviors of hydrogenated diamond-like carbon (H-DLC) films are investigated on a ball-on-disk type tribometer in dry N2 and dry vacuum. The result shows that the friction behaviors of the H−DLC films are very sensitive to the testing environment, the H-DLC films exhibit a very low friction coefficient of 0.016 in dry N2, and similarly in an inert gas the friction coefficient increases to about 0.063 in dry vacuum. Combining the testing conditions, friction results, SEM and XPS investigation, it is concluded that the friction behaviors of the hydrogenated DLC films are associated with surface hydrogen of the H-DLC films and are dictated by whether or not hydrogen bonds are formed between the transfer films/H-DLC films at the sliding interface. A hydrogen-induced hydrogen bond model is proposed to interpret the friction behaviors of hydrogenated DLC films in different environments.
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Received: 27 October 2011
Published: 30 April 2012
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| PACS: |
62.20.Qp
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(Friction, tribology, and hardness)
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81.05.U-
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(Carbon/carbon-based materials)
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