纳米MoS2的摩擦学特性

采用EDS分析磨痕表面元素的化学状态，扫描电子显微镜观察磨痕表面形貌，在MS-800A四球摩擦磨损实验机上考察MoS2纳米材料作为润滑油添加剂的摩擦学特性。通过对刚球磨斑直径、PB值的变化分析MoS2纳米材料的形貌、添加剂含量对润滑油摩擦性能的影响。结果表明．MoS2纳米颗粒具有好的减磨性能和极压性能，MoS2纳米纤维对增加极压性能影响不大。随着添加剂含量的增加，润滑油的减磨性降低，极压性提高。纳米MoS2对摩擦副的减磨和极压性能改善的原因是由于其吸附于摩擦副表面，在摩擦过程中，纳米MoS2分解，生成含Mo的氧化膜，起到改善摩擦学性能的作用。

Tribological Property of MoS2 Nanomaterials

The tribological behavior of MoSz nanomaterials are investigated as additives in lubricating oils on MS-800A four-ball tester. The chemical states of the elements on the surface of steel ball worn in different lubricating conditions are determined by EDS, and the morphologies of the surfaces of steel ball worn in different lubricant systems are observed on a scanning electron microscope. The affecting factors on tribological properties such as the MoSz nanomaterials shape, the additives content are discussed through the width of the grind spot diameter and P/3 values. The results show that MoSz nanoparticles can decrease the abrasion and improve the extreme pressure properties, but the MoSz nanofibers almost have no effect on the extreme pressure properties. With the increase of the additive content, the antiwear capacity is decreased and the extreme pressure is increased. The reduction of the friction and improve the extreme pressure of the friction pair by the nanoparticles is resulted from the easier absorption of the nanoparticles on the friction pair and the formation of protective film by the readily decomposition of the nanoparticles in the sliding process, therefore the tribological property is updated.