含二硫化钼、石墨和三氧化二锑的水性环氧树脂粘结固体润滑涂层的摩擦磨损性能

以水作为分散介质，制备了含MoS2、石墨和Sb2O3等组分的水性环氧树脂粘结固体润滑涂层；其具有价格低廉、无毒、不燃等优点，并且不含挥发性有机化合物（VOC），是一类具有很好发展前景的环保型固体润滑涂层。采用MFT-R 4000型往复摩擦磨损试验机考察了所制备的水性环氧树脂粘结固体润滑涂层的摩擦磨损性能；利用扫描电镜和X射线光电子能谱仪分析了涂层磨损表面和转移膜的形貌，以及涂层磨损表面典型元素的化学状态，进而探讨了其润滑失效机理。结果表明：所制备的水性环氧树脂粘结固体润滑涂层具有良好的减摩抗磨性能；Sb2O3与MoS2之间，以及石墨与MoS2之间具有一定的协同减摩抗磨作用。相应的协同减摩抗磨作用分别源于机械相互作用以及水蒸气吸附导致的石墨层间吸引力减弱；而涂层发生润滑失效的主要原因为疲劳磨损和微断裂。

Preparation and Friction and Wear Behavior of Waterborne Epoxy Resin-Based Bonded Solid Lubricant Coatings

Epoxy resin-based bonded solid lubricant coatings containing three types of solid lubricants (MoS2, graphite, and Sb2O3) were prepared using water as the dispersing medium. The epoxy resin-based bonded solid lubricant coatings were inexpensive, non-toxic, inflammable, and free of any volatile organic compounds (VOC), which made the coating environmentally friendly. An MFT-R 4000 type reciprocal friction and wear tester was used to evaluate the friction and wear behavior of the epoxy resin-based bonded solid lubricant coatings. The morphologies of the worn surfaces of the coatings and the transfer films on the counterpart steel surfaces were analyzed by using a scanning electron microscope, while the chemical states of Mo on the unworn and worn coating surface were analyzed by using an X-ray photoelectron spectrometer. And the wear mechanisms of the coatings were explored and discussed. It was found that the as-cured epoxy resin-based bonded MoS2-graphite-Sb2O3 coatings had better wear resistance and fatigue resistance than that of coatings with single and binary solid lubricants. Synergistic effects on anti-wear and anti-fatigue were found for two combinations, i.e. Sb2O3 and MoS2, graphite and MoS2. The synergistic effect of Sb2O3 and MoS2 was mainly related to mechanical interaction, and that of graphite and MoS2 was mainly due to reduced inter-layer interactions by adsorption of moisture on the surface of graphite. The failure of the bonded solid lubricant coatings was largely attributed to fatigue wear and micro-cracking induced by friction.