纳米二硫化钨在菜籽油中的摩擦学行为及机制

Tribological Behavior and Mechanism of Nano-tungsten Disulfide in Rapeseed Oil

在菜籽油中加入经修饰的纳米WS2,并分析油样的稳定性,使用四球摩擦磨损试验机考察不同纳米WS2含量菜籽油的摩擦学性能。试验结果表明:经修饰的纳米WS2在菜籽油中具有良好的分散稳定性;纳米WS2可以提升菜籽油的润滑性能,且在一定的范围内,纳米WS2掺量越高,摩擦因数和磨斑直径越小;在纳米WS2掺量相同时,压力越高抗磨减摩效果越好,说明纳米WS2有良好的极压润滑性能。用扫描电镜、能谱仪和X射线光电子能谱对试验后钢球磨斑表面形貌、典型元素含量和化学状态进行了分析,结果表明,纳米WS2在钢球表面产生了吸附,并会参与摩擦化学反应,生成了由纳米WS2、WO3、Fe2O3和FeSO4等组成的边界润滑膜。

The modified nano WS 2 was added to the rapeseed oil and the stability of the oil sample was tested. The tribological properties of rapeseed oil with different nano-WS 2 content were investigated by four-ball tester.The results show that modified nano-WS 2 has good dispersion stability in rapeseed oil.Nano-WS 2 can improve the lubrication performance of rapeseed oil,and within a certain range,the higher the content of nano-WS 2,the smaller the friction coefficient and wear spot diameter.At the same dosage of nano-WS 2 the anti-wear and friction reduction effect of nano-WS 2 is more obvious under higher pressure,it shows that nano-WS 2 has good extreme pressure lubrication performance.The surface morphology,typical element content and chemical state of the wear surface of steel ball were analyzed by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray photoelectron spectroscopy(XPS).The results show that nano-WS 2 is adsorbed on the surface of the steel ball and participates the tribochemical reaction,and the boundary lubrication film composed of WS 2,WO 3,Fe 2O 3 and FeSO 4 is formed.