含硫化铜纳米粒子润滑脂的微动磨损性能研究

Fretting Wear Behavior of CuS Nanoparticles in Grease

在微动磨损试验机上考察了含有硫化铜纳米粒子脲基脂的微动磨损性能。结果表明:硫化铜纳米粒子能显著降低微动磨损体积,随着纳米粒子含量增加,微动磨损量降低;在微动磨损后期纳米粒子的存在还能降低摩擦因数。低负荷下,润滑脂中硫化铜纳米粒子有利于降低微动磨损量;但在高负荷条件下,磨损量迅速增大,说明高负荷下微动磨损方式发生了变化。XPS分析表明,微动磨斑表面膜含有Cu、FeS等物质,说明硫化铜纳米粒子能显著降低微动磨损的原因在于纳米粒子化学性质非常活泼,在微动过程中容易与摩擦表面发生化学反应,形成具有保护性的沉积物膜和化学反应膜。

Fretting wear behavior of CuS nanoparticles in urea grease was studied in fretting wear tester. The results show that the existence of CuS nanoparticles can reduce fretting wear evidently. Fretting wear volume is decreased with the increase of nanoparticles concentration, and the existence of CuS nanoparticles can reduce friction coefficient at the latter fretting time. At the conditions of low normal load, nanoparticles helps to reduce fretting wear, but high normal load results in high fretting wear. The results of XPS tests show that Cu and FeS are founded in the film of wear scar. The reason that CuS nanoparticles has remarkable friction-reducing and anti-wear property is that the protective layer is formed on the wear surface by friction chemical reaction during fretting wear test.