采用95 nm、0．74和1．75μm 3种不同粒径WS2粉体作为添加剂制备了锂基润滑脂,并利用四球摩擦磨损试验机分别考察了其摩擦学性能,采用SEM、EDAX、XPS分析了磨损表面的形貌、元素成分及其化学状态。结果表明,WS2作为润滑脂添加剂具有非常优异的摩擦学性能,其中95 nm粒径 WS2粉体表现出的性能最优。研究表明 WS2添加剂的润滑作用机理是吸附膜,沉积膜或化学反应膜相互作用的结果,不同润滑状态其作用方式也不同,在中高载荷条件下吸附在摩擦副表层的 WS2易发生渗镀现象,并可在亚表层内形成致密的 WO 3化学反应膜。
Three different WS2 powder:95 nm,0.74,1.75μm in diameter were applied as an additive to prepare lithium grease,and their tribological properties were investigated respectively by four-ball tribometer.After that the morphology ,elemental composition and chemical state of the worn steel ball’s surface were analysed.The results show that,WS2 powder as grease additive has a very excellent tribological properties,especially 9 5 nm WS2 powder.Studies have also shown that the lubrication mechanism of WS2 powder additives was the interac-tions of the three elements:adsorbed film,a deposited film and a chemically reactive film,which play diffent roles in differnt lubrication.For example,the WS2 strongly absorbed to the friction pairs was prone to permea-ting into the inside where oxidation reaction occurs,and a dense WO3 film forms.
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