Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions  

作　　者：Kuiliang GONG Wenjing LOU Gaiqing ZHAO Xinhu WU Xiaobo WANG 

机构地区：[1]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Qingdao Center of Resource Chemistry&New Materials,Qingdao 266000,China

出　　处：《Friction》2020年第4期674-683,共10页摩擦（英文版）

基　　金：The authors are thankful for financial support of this work by National Key Research and Development Program of China(No.2018YFBO703802);National NaturalScienceFoundationofChina(Nos.NSFC51875553 and 51775536).

摘　　要：Despite excellent tribological behaviors of ionic liquids (ILs) as lubricating oils, their friction-reducing and anti-wear properties must be improved when they are used under severe conditions. There are only a few reports exploring additives for ILs. Here, MoS2 and WS2 quantum dots (QDs, with particle size less than 10 nm) are prepared via a facile green technique, and they are dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm]PF6), forming homogeneous dispersions exhibiting long-term stabilities. Tribological test results indicate that the addition of MoS2 and WS2 QDs in the IL can significantly enhance the friction-reducing and anti-wear abilities of the neat IL under a constant load of 500 N and a temperature of 150 °C. The exceptional tribological properties of these additives in the IL are ascribed to the formation of protective films, which are produced not only by the physical absorption of MoS2 and WS2 QDs at the steel/steel contact surfaces, but also by the tribochemical reaction between MoS2 or WS2 and the iron atoms/iron oxide species.

关 键 词：MoS2 and WS2 quantum dots ionic liquids lubricant additive friction reduction and anti-wear severe conditions 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O471.1[理学—半导体物理]