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 sur-faces were analyzed by means of scanning electron microscopy (SEM) and optical microscope. Ele-mental 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.%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.
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