纳米Al_2O_3增强PA6复合材料的摩擦磨损性能研究

Friction and Wear Properties of PA6 Composites Filled with Nanocrystalline Al_2O_3

利用MMW 1型摩擦磨损试验机考察了纳米Al2O3增强PA6复合材料同45#钢对摩时的摩擦磨损性能,采用扫描电子显微镜观察分析了试样磨损表面形貌.结果表明:纳米Al2O3可以提高PA6的耐磨性能;在小于100N低载荷下纳米Al2O3填充PA6复合材料的滑动摩擦系数符合粘弹性材料的变化规律;只有当填充量适当时,纳米Al2O3微粒才能有效地增强聚合物基体的抗磨粒磨损性能,并阻碍聚合物基体向偶件磨损表面的粘着转移;纳米Al2O3质量分数为10%的PA6复合材料的抗磨性能最佳.

The composites of PA6 filled with Al_2O_3 nanoparticles were prepared by extrusion of the mixed polymeric matrix and the nano particulates on a twin-screw rod machine and injection molding of the extruded granules. The friction and wear properties of the resulting polyamide-6 composites with different contents of nanocrystalline Al_2O_3 sliding against 45~# steel in dry ambient conditions were evaluated on an MMW-1 friction and wear tester. The worn surfaces of the composites were observed on a scanning electron microscope. It was found that the incorporation of the Al_2O_3 nanoparticles in PA6 contributed to greatly reducing the wear mass loss of PA6. The PA6 composite containing 10% Al_2O_3 nanoparticles showed the best friction-reducing and antiwear behavior, which was related to the stronger interfacial bonding between the nano-filler and the polymeric matrix in this case. Moreover, the differences in the tribological behaviors of the composites with different compositions were closely related to the differences in the corresponding worn surface morphologies. It was imperative to keep a relatively lower filler content in the filled PA6 composite so as to get rid of the severe scratch to the counterpart steel surface.