树脂基复合材料中石墨与MoS_2的减摩作用机理

Antifriction Mechanism of Graphite and MoS_2 in Epoxy Composites

针对我国传统铁路滑床板在应用过程中存在的浪费和污染问题,研制了环氧树脂基减摩复合材料涂层以替代润滑油层,改善滑床板的性能.在M200环块磨损试验机上考察了复合材料中减摩相对复合材料-钢摩擦学特性的影响,对磨损后的钢试样表面进行了X光电子能谱分析与扫描电镜观察,对石墨与MoS2的减摩作用机理进行了探讨.结果表明:复合材料中添加石墨可有效降低摩擦副的摩擦系数,大幅度提高复合材料的耐磨性;MoS2在摩擦过程中发生氧化转变为MoO3,失去了层状结构,因而不能降低摩擦系数,但同时MoS2抑制了树脂向钢试样表面的转移,可有效提高复合材料的耐磨性.

To overcome the shortcomings of existing switch slide baseplates, a kind of epoxy composite was designed to act as lubricating coating for a switch slide baseplate. The wear tests of epoxy composite specimens paired with A3 steel specimen under air-lubricated condition were carried out on M200 ring-block wear tester, the worn surfaces of steel specimens were analyzed by X-ray photoelectron spectroscopy and observed by scanning electron microscope. The antifriction mechanism of graphite and MoS2 was discussed. The results show that the graphite added in epoxy composite can reduce the friction coefficient, and increase the wear resistance of the epoxy composite greatly. MoS2 in epoxy composite is transformed into MoO3 during the friction process, and the friction coefficient of the pair cannot be decreased due to lack of layer structures inside MoO3, but MoS2 can improve the wear resistance of the composite via restraining the epoxy transfer from the surface of composite to the surface of A3 steel.