Investigations of the superlubricity of sapphire against ruby under phosphoric acid lubrication  

作　　者：Jinjin LI Chenhui ZHANG Mingming DENG Jianbin LUO 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University,Beijing,100084,China [2]Shenzhen Key Laboratory of Micro-Nano Manufacturing,Research Institute of Tsinghua University in Shenzhen,Shenzhen,518057,China

出　　处：《Friction》2014年第2期164-172,共9页摩擦（英文版）

基　　金：supported by the National Key Basic Research and Development Program(973)of China(2013CB934200);Foundation for the Supervisor of Beijing Excellent Doctoral Dissertation(20111000305);the National Natural Science Foundation of China(NSFC)(Nos.51321092,51027007).

摘　　要：In this study,we address the superlubricity behavior of sapphire against ruby(or sapphire against itself)under phosphoric acid solution lubrication.An ultra-low friction coefficient of 0.004 was obtained under a very high contact pressure,with a virgin contact pressure up to 2.57 GPa.Related experiments have indicated that the load,sliding speed,and humidity of the test environment can affect superlubricity to some degree,so we tested variations in these conditions.When superlubricity appears in this study a thin film is present,consisting of a hydrogen bond network of phosphoric acid and water molecules adsorbed on the two friction surfaces,which accounts for the ultra-low friction.Most significantly,the wear rate of the sapphire and ruby in the friction process is very slow and the superlubricity state is very stable,providing favorable conditions for future technological applications.

关 键 词：FRICTION SUPERLUBRICITY SAPPHIRE aqueous lubrication 

分 类 号：TG1[金属学及工艺—金属学]