纳米坡缕石/铜复合材料对钢球摩擦副的摩擦学性能

采用化学还原法和球磨共混添加法制备了纳米坡缕石/铜（P/Cu）复合材料，采用粒度分析仪和透射电子显微镜（TEM）对复合纳米粒子的粒度和形貌进行表征。利用四球摩擦磨损试验机考察了不同纳米P/Cu添加量和不同P与Cu配比的复合粉体作为润滑油添加剂对高副钢球摩擦副的摩擦学性能，利用扫描电子显微镜（SEM）、X射线能谱仪（EDS）对摩擦表面进行形貌、元素性能分析。结果表明，所制备的纳米P/Cu粒径基本小于100 nm，分散稳定性良好，在纳米P/Cu为1wt%且P：Cu＝3：1（质量比）添加量下表现出最优的摩擦学性能，其钢球磨斑直径比基础油的减小了20.7%。纳米P/Cu可在摩擦表面生成含Mg、Al、Si和Cu等元素的自修复膜，补偿摩擦磨损且使摩擦表面变光滑。

Tribological properties of nano-palygorskite/copper composites as lubricant additive to steel ball tripair

The nano-palygorskite/copper (nano-P/Cu)composites were prepared by liquid chemical reduction method and mechanical ball milling. The size and morphology of the nanoparticles were described by means of transmission electron microscopy(TEM) and particle size analyzer. The tribological properties of nano-P/Cu powders, in different mass fraction and component proportion, as 150 N base oil additive, were evaluated on a four ball friction and wear tester. The morphologies, element distributions and micromechanical properties of the worn surface were investigated by means of scanning electron microscopy(SEM) and energy dispersive spectrometry(EDS). The results indicate that almost all particle size of nano-P/Cu is less than 100 nm and the lubricant oil with nano-P/Cu additives is good in dispersion effect and stable. For steel ball tribopair, the tribological properties are best while the component mass ratio and content of nano-P/Cu composites is P:Cu=3:1 and 1wt% respectively. The wear scar diameter of sample lubricated with nano-P/Cu additive decreases 20.7% compared with the none additive. It can be deduced that an auto-restoration film composed of Mg, Al, Si and Cu elements forms on the worn surface to compensate the wear loss and make the surface smoother.