超微坡缕石/Cu复合粉体作为润滑油添加剂的摩擦学性能

Tribological Properties of Ultrafine-palygorskite/Copper Composite Powder as Lubricant Additive

将球磨改性的超微坡缕石/Cu复合粉体(超微P/Cu)作为添加剂加入150N基础油中,利用四球摩擦磨损试验机考察润滑油极压性能、载荷和速度对其减摩抗磨性能的影响。采用扫描电子显微镜、X射线能谱分析仪、X射线光电子能谱仪对钢球磨斑表面形貌和化学元素进行分析。结果表明:超微P/Cu能够提高基础油的摩擦学性能,其最大无卡咬合负荷PB值比基础油提高了26.3%,比超微粉体P和Cu单独作用提高了9.1%;载荷和转速影响超微P/Cu的减摩抗磨性能,当载荷为245N、转速为1200r/min时,超微P/Cu具有良好的减摩抗磨性能。超微P/Cu较佳的减摩抗磨机制,归因于复合超微粒子在摩擦表面生成了孔状结构的坡缕石自修复膜和铜的延展膜。

The ultrafine-palygorskite/copper composites(ultrafine-P/Cu)were prepared by mechanical ball milling.The extreme pressure properties and the effect of load and speed on tribological properties of ultrafine-P/Cu powders,as 150N base oil additive,were evaluated on a four ball friction wear tester.The morphologies,element distributions and micromechanical properties of the worn surface were investigated by means of scanning electron microscopy,energy dispersive spectrometry and X-ray photoelectron spectroscopy.The results indicate that ultrafine-P/Cu used as a lubricant additive can effectively improve the tribological properties of base oil.The non-seizure value P B of ultrafine-P/Cu lubricant is increased by 31.6%than the base oil and by 9.1%than the single particles.Load and speed can affect the tribological properties of ultrafine-P/Cu.Ultrafine-P/Cu exhibits the optimum friction-reducing property and anti-wear property at the load of 245N and speed of 1200r/min,respectively.The excellent tribological properties of ultrafine-P/Cu can be attributed to the porous auto-restoration film of palygorskite and extended film of Cu formed on the worn surface to compensate wear and repair friction.