含纳米PTFE颗粒润滑脂的润滑性能研究

摘要

The effect of the nano-PTFE particles as additive on the tribological properties of the titanium complex grease was investigated by a four-ball tester. The morphology of wear scar of steel ball was observed using the sweep electron microscope ( SEM ) . The chemical states of the typical elements on wear scar of steel ball were analyzed by means of the X-ray photoelectron spectroscopy(XPS). The results show that the titanium complex grease containing 3% nano-PTFE has the best tribological performance, and the friction coefficient is decreased by 25.4% ,the wear scar diameter is decreased by 18. 9% . The metal fluoride is generated on the surface of steel ball for nano-PTFE particles,which has effectively inhibited the adhesive wear and contact fatigue of the friction surface.%在四球摩擦磨损试验机上考察纳米PTFE颗粒作为添加剂对复合钛基润滑脂摩擦磨损性能的影响,采用扫描电子显微镜分析试验钢球磨斑的表面形貌,并利用X射线光电子能谱仪检测磨斑表面化学元素的组成及状态.结果表明,在一定添加量范围内,纳米PTFE可以改善复合钛基润滑脂的摩擦磨损性能,其中纳米PTFE质量分数为3％时,复合钛基润滑脂具有最佳的抗磨、减摩性能,可使摩擦因数、磨斑直径分别降低约25.4％和18.9％.纳米PTFE颗粒在钢球表面发生摩擦化学反应,生成了一层金属氟化物,有效地抑制了摩擦表面的黏着磨损和接触疲劳.