The tribological properties of single and mixed nano-particles of WS2 and MoS2as lubricant additives were investigated by using a four-ball tester. The surface morphology of wear scar was observed by inverted metallurgic microscope, the chemical states of several typical elements on the worn surfaces were examined by scanning energy dispersive X-ray spectrometer, and the lube oil samples after abrasion test were analyzed by ferrograph. Test results show that these two nano-particles additives both exhibit excellent tribological properties due to forming adsorption-chemical reaction mixed protection films on the surfaces of the friction pair during lubrication action, as a result, the main wear mechanisms of the surface might change, so that the lube oil displays good anti-wear, friction-reducing and extreme pressure properties. Furthermore, the mixed nano-particles show better anti-wear and friction-reducing properties than those of the single ones, though its extreme pressure property was rather weak.%在四球摩擦磨损试验机上,研究WS2、MoS2单一纳米粒子及WS2-MoS2混合纳米粒子作为润滑油添加剂的摩擦学性能,用倒置金相显微镜观察摩擦副的磨痕表面形貌,用扫描电镜-X光电子能谱仪分析磨斑表面主要元素的化学状态,用分析式铁谱仪对磨损试验后的油样进行铁谱分析.结果表明:两种纳米粒子添加剂均具有优良的摩擦学性能,原因在于润滑后摩擦副表面混合膜的存在,改变了表面的主要磨损机制,从而使润滑油表现出良好的抗磨、减摩和极压性能.相比单一的纳米粒子,含WS2-MoS2混合纳米粒子的润滑油极压性能较差,但具有更好的抗磨、减摩性能.
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