钛基纳米润滑添加剂的减摩抗磨及自修复特性对比

针对恶劣工作环境会加剧机械设备摩擦副间的磨损而降低其服役寿命的问题,对比研究3种纳米添加剂TiO2、TiN和TiC在不同工况下的摩擦学性能及其自修复性能。根据SH-T0762-2005标准润滑油摩擦因数测定法,并利用MRS-10A型四球磨损试验机磨斑测量光镜、激光共聚焦显微镜和能量色散谱仪(EDS)对磨损表面进行表征,探讨其润滑抗磨及自修复机理。结果表明:钛基纳米添加剂的加入很好地改善了润滑油的抗磨减磨性能,并使其具有一定的自修复性能;当钛基纳米质量分数为0.5%时,其减摩抗磨性能达到最佳。3种纳米添加剂中,对润滑油减摩抗磨性能改善效果最好的是纳米TiO2,而自修复效果最好的则为纳米TiN。故纳米TiN和纳米TiO2作为润滑油添加剂,具有较好的减摩抗磨和自修复能力。

Comparison of Friction Reducing Anti-wear and Self-repairing Properties of Different Ti-base Nanometer Lubricating Oil Additives

Poor working environment worsens the wear of mechanical equipment friction pair, thereby reducing its service life. The tribological behaviors and selfrepairing mechanism of different nanometer lubricating oil additives TiO2, TiN and TiC were comparatively investigated in different working conditions. Based on the SHT07622005 test method for determination of the frictional coefficient of lubricants, the lubrication antiwear and selfrepairing mechanism were analyzed by the fourball test machine(MRS10A) grinding spot measurement system, laser scanning confocal microscopy(OLS1100) and energy spectrum analysis(EDS). The results show that the antiwear and friction reducing characteristics of lubricating oil with Tibase nanometer additives are better than those of base oil, and they have a certain selfrepairing performance. Meanwhile, the friction reducing antiwear characteristics reach the best when the mass fraction of the Tibase nanometer additive is 0.5%. The friction reducing antiwear characteristics and the selfrepairing performances of the three nanometer additives are different, while the nanometer additive TiO2 has the best antifriction and antiwear characteristics and the nanometer additive TiN has the best selfrepairing performance. Therefore, the nanometer TiN and nanometer TiO2 as lubricating oil additives have better friction reducing antiwear and selfrepairing ability.