纳米Al2O3填充聚四氟乙烯摩擦磨损性能的研究

利用ＭＭ－２００型摩擦磨损试验机考察了填料含量及载荷对纳米Ａｌ２Ｏ３填充ＰＴＦＥ复合材料摩擦磨损性能的影响，采用扫描电子显微镜观察分析磨损表面形貌及磨损机理，结果表明，纳米Ａｌ２Ｏ３可以提高ＰＴＦＥ的耐磨性，但Ａｌ２Ｏ３会导致严重的塑性变形，并且Ａｌ２Ｏ３含量越高，塑性变形越严重，当Ａｌ２Ｏ３的质量分数为１０％时，填充ＰＴＦＥ复合材料的磨损最小；随着载荷的增大，填充ＰＴＦＥ的磨损增加，填充ＰＴＦＥ

Friction and Wear Properties of Nanocrystalline Al_2O_3 Filled PTFE Composites

The friction and wear properties of polytetrafluoroethylene (PTFE) composites filled with nanocrystalline Al 2O 3 were evaluated with an MM 200 friction and wear tester. The worn surfaces of PTFE composites were examined by means of scanning electron microscopy (SEM). It has been found that the incorporation of nanocrystalline Al 2O 3 into PTFE increases the wear resistance of PTFE but worsens the friction reduction performance to some extent. The friction coefficient of PTFE composites increases with the increasing of Al 2O 3 content. The best wear resistance of the composite is reached at a mass fraction of Al 2O 3 about 10%. Moreover, nanocrystalline Al 2O 3 as the filler in PTFE leads to enhanced plastic deformation of PTFE matrix in the composite, which subsequently increases the friction coefficient.