超细锡粉改善锂基润滑脂摩擦学性能研究

为提高锂基润滑脂的摩擦学性能，以超细锡粉为润滑添加剂研究了粉体的加入方式、粒径、加入量及载荷变化对锂基润滑脂摩擦学性能的影响，并采用SEM、EDS等手段对钢球表面磨斑进行分析。结果表明，直接加入超细锡粉体制备润滑脂的摩擦学性能优于分散后加入锡粉体的锂基润滑脂；采用平均粒径为90 nm的超细锡粉、添加量为2%时，锂基润滑脂的摩擦学性能最优。其作用机理在于锡粉在钢球表面具有自修复作用。含超细锡粉的润滑脂更适合在高载荷下工作。

STUDY ON THE TRIBOLOGICAL PROPERTIES OF LITHIUM BASE GREASE WITH ULTRA-FINE TIN POWDER

In view of improving the tribological properties of lithium base grease ultra-fine tin powder was added, and the influence of adding methods, average particle size of the powder, adding amount and load on the tribological properties of lithium base grease was discussed. Scanning Electron Microscope (SEM) and Energy Disperse Spectroscopy (EDS) were employed to measure the surface of wear scar. Test results showed that when directly adding 2% of an ultra-fine tin powder having an average particle size of 90 nm, said lithium base grease exhibited an optimum anti-wear property. The mechanism of the improved tribological properties of lithium base grease with tin powder could be attributed to the self-repair function of ultra-fine tin particles on the surface of steel-ball. The research also found that the lithium base grease was more suitable for working under high load conditions when ultra-fine tin powder was added.