Hydrodynamic effect on the superlubricity of phosphoric acid between ceramic and sapphire
作者机构：State Key Laboratory of TribologyTsinghua UniversityBeijing100084China Shenzhen Key Laboratory of Micro-Nano ManufacturingResearch Institute of Tsinghua University in ShenzhenShenzhen518057China
出 版 物：《Friction》 (摩擦（英文版）)
年 卷 期：2014年第2卷第2期
页 面：173-181页
核心收录：
学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Key Basic Research(973)Program of China(No.2013CB934200) the National Natural Science Foundation of China(Nos.51222507,51335005,51321092)
主 题：liquid superlubricity phosphoric acid hydrodynamic lubrication film thickness
摘 要：In this work,a super-low friction coefficient of 0.003 was found between a silicon nitride ball and a sapphire plate lubricated by phosphoric acid *** wear mainly occurred in the running-in period and disappeared after superlubricity was *** friction coefficient was effectively reduced from 0.3 to 0.003 at a constant speed of 0.076 m/s,accompanied by a 12-nm-thickness *** lubrication regime was indicated to change from boundary lubrication in the running-in period to elastohydrodynamic lubrication in the superlubricity period,which is also supported by the results of the friction coefficient versus sliding *** addition,the experimental results showed good agreement with theoretical calculations based on the elastohydrodynamic lubrication theory,suggesting a significant hydrodynamic effect of phosphoric acid on superlubricity.
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