非晶碳薄膜固体超滑设计的滚-滑原则

Rolling-Sliding Mechanism in Achieving Solid Superlubricity of Amorphous Carbon Films

固体超滑是指相互接触的滑动固体表界面间摩擦系数极低(10-3量级或更低)的现象,因此,开展固体超滑理论和超滑技术研究具有重要意义.目前碳基薄膜固体超滑设计原则是引入杂原子后的表面钝化作用,尤其氢含量起到决定性作用,通常要求氢原子分数高于40%.然而依据相图,高氢碳薄膜体系仅占碳薄膜种类的小部分,大量无钝化或者少钝化非晶碳薄膜超滑设计缺乏理论指导.本文作者在前期研究基础上综述了国内外最新进展,面向贫氢非晶碳薄膜体系,提出从滚-滑角度认识无序界面无钝化或者钝化不足情况下摩擦机理,包括滑动机理、滚动机理、滚动-滑动共存,并在此基础上探讨了碳基薄膜的可能发展趋势,以及固体超滑可能的设计原则和方案.

Solid superlubricity describes the state that coefficient of friction is lower than 10-3 between two sliding interfaces. The development of solid superlubricity mechanism and superlubricity technology are of great significance.Diamond-like carbon films(DLC) superlubricity is heavily relied on the passivation of the introduced heteroatoms(hydrogen),especially when the content of hydrogen is higher than 40%. However,carbon films with high hydrogen content are just a fraction according to ternary phase diagram of DLC films. A large number of passivated or less passivated carbon films are lack of theoretical guidance in achieving superlubricity. Under the basic of latest progress at home and abroad,this review proposed the rolling-sliding mechanism towards disordered and unpassivated or less passivated carbon films,which includes sliding mechanism,rolling mechanism and rolling-sliding mechanism.Furthermore,the possible development tendency and design principles and programs of solid superlubricity were discussed.