纳米坡缕石润滑油添加剂对45^#钢摩擦副的抗磨及自修复性能

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制备的纳米坡缕石粒子经KH550表面修饰后分别按质量分数为2,4添加到150N基础油中,采用MMU-10G摩擦磨损试验机考察其作为润滑油添加剂对45#调质钢摩擦副的抗磨减摩和自修复性能。利用电子天平测定试样的失重量以表征其耐磨性能和自修复效果,用光学显微镜和SEM对摩擦表面形貌进行观察和分析,借助EDX测定摩擦表面成分的变化。结果表明：试样在纳米坡缕石添加剂为2的润滑油体系中自修复作用微弱,磨损率下降有限,减磨仅发生在初期磨合阶段;而试样在坡缕石添加剂为4的润滑油体系中总磨损量比纯基础油体系下降了26.5,经成分和形貌分析,该试样表面生成了含坡缕石特征元素呈斑状分布的自修复膜层,耐磨性和自修复效果最好。 The 150N base oil containing 2% and 4% mass fraction of nano-palygorskites modified with KH550 as additive were prepared.The anti-wear,friction-reducing and self-repairing behaviors of nano-palygorskites as additive in base oil were observed on the MMU-10G abrasive-wear tester.The wear loss of the sample was studied by electronic balance（EB）.The morphographies of the worn surfaces were analyzed by means of scanning electron microscopy（SEM） and optical microscope.Elemental analysis was performed using an energy-dispersive X-ray（EDX） microanalyzer.The results show that the lubricating base oil containing 2% mass fraction of nano-palygorskites as additive has very weak self-repairing performance to 45# steel tribo-pair,the wear loss decreases limited and the anti-wear only occurs in early running-in stage;Lubricating base oil containing 4% mass fraction of nano-palygorskites as additive exhibits better anti-wear and self-repairing performance.Total wear loss decreases observably as high as 26.5% compared to that of pure base oil.Self-repairing films made up of characteristic elements of palygorskite in patchy distribution are observed on the surface of the sample.