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.
出处
《Friction》
SCIE
EI
CAS
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).
