不同金属基体上MoS2纳米微粒LB膜摩擦学行为研究

研究了Ｃｕ、Ａｇ及Ａｕ等金属基体上二烷基二硫代磷酸修饰ＭｏＳ２纳米微粒ＬＢ膜的摩擦学性能，用红外显微镜分析ＬＢ膜在摩擦过程中的结构变化，用电子探针分析考察不同金属基体上ＬＢ膜的磨痕形貌．结果表明：ＤＤＰ修饰ＭｏＳ２纳米微粒ＬＢ膜可有效降低Ａｇ和Ｃｕ与ＧＣｒ１５钢对摩时的摩擦系数；该ＬＢ膜极易向对偶转移并在摩擦过程中发生摩擦化学变化，主要包括无序化转变及修饰剂的部分分解；无机纳米核起主要承载和抗磨作用．Ｃｕ基体上的ＬＢ膜耐磨寿命较Ａｇ基体上ＬＢ膜的耐磨寿命高１００倍，这主要因ＬＢ膜与Ａｇ基体的结合较弱．

Tribological Behavior of MoS2 Nanoparticle LB Films on Different Metal Substrate

The tribological behaviors of dialkyldithiophosphate (DDP) capped MoS 2 nanoparticle (MoS 2 DDP) LB films on copper, silver and gold substrates were studied. The structural changes during rubbing process have been investigated by means of Fourier Transform Infrared (FTIR) microspectroscopy. The surface morphology of the wear track of the LB films on different metal substrates was observed with an EPM 810 electron probe microanalyzer. The results show that the LB films can lower strikingly friction coefficient of silver and copper substrate under certain experiment conditions. A transfer film formed on the steel counterface, and tribochemical changes occurred during friction process, which mainly include disordering and partial decomposition of surface modifying agent. The nucleus of MoS 2 nanoparticle plays a role in load carrying and wear resisting, especially after partial decomposition of surface modifying agent with increasing of friction duration. The wear resistance of the LB films on copper is higher by a factor of 100 and one of the main reasons is that adhesive strength between the film and silver substrate is weaker.