纳米TiO2/PTFE复合材料的干摩擦磨损性能

利用磨损试验机、扫描电子显微镜等方法研究了表面处理与未处理纳米TiO2(质量分数为6％)填充聚四氟乙烯(PTFE)复合材料的干摩擦性能。结果表明，纳米TiO2能明显提高：PTFE耐磨性并改变其磨屑形成机理。表面处理纳米TiO2在PTFE中能较均匀分散。纳米TiO2填充PTFE复合材料的摩擦系数比PTFE稍大，纳米TiO2表面处理与否对PTFE复合材料的摩擦系数影响不大，但表面处理纳米TiO2填充聚四氟乙烯耐磨性比PTFE有显著提高，表面处理与表面未处理纳米TiO2填充PTFE复合材料的耐磨性比PTFE可分别提高7倍和3倍左右。导致PTFE磨损的重要机理是粘着磨损。

Dry Friction and Wear Behavior of PTFE/Nano-meter TiO2 Composite

The dry friction and wear behavior of PTFE composites filled with surface treated and untreated nano-meter TiO 2 were tested by means of MM-200 tester and SEM. The results indicated that the addition of nano-meter TiO2 could improve the wear resistance of PTFE significantly and change the mechanism of wear scraps.Surface treated nano-meter TiO 2 could disperse well in PTFE matrix. The friction coefficient of PTFE/nano-meter TiO 2 composites increased slightly,the surface treatment of nano-meter TiO 2 had little effect on the friction coefficient, but the wear resistance of PTFE filled with surface treated nano-meter TiO 2 increased significantly.The wear resistance of PTFE composites filled with modified nano-meter TiO 2 increased by 7 times and 3 times or so ,compared with PTFE composites filled with unmodified nano-meter TiO 2 and PTFE.The key wear mechanism was adhesive wear.