基于UHMWPE/纳米ZnO复合材料的滑动摩擦磨损机制

Sliding Tribological Behavior of Nano-ZnO Filled Ultra High Molecular Weight Polyethylene Composites

用热压成型法制备了超高分子量聚乙烯(UHMWPE)纳/米ZnO复合材料,采用销盘式摩擦磨损试验机考察了载荷和相对滑动线速度对复合材料摩擦学性能的影响;采用扫描电子显微镜观察了复合材料磨损表面形貌。结果表明:在低载荷试验条件下磨损机制为粘着磨损,在高载荷试验条件下磨损机制为粘着磨损和疲劳磨损。而在一定载荷试验条件下,无论相对滑动线速度高或低,复合材料的磨损机制主要表现为粘着磨损,只是在高速情况下粘着磨损程度加大,局部还出现了表面撕裂的痕迹。

Ultra high molecular weight polyethylene （UHMWPE） based composites filled with nanometer ZnO were prepared by heat compression molding. The effects of load and relative sliding linear velocity on the tribological behavior of the composites were investigated on a pin-on-disc test rig. The worn surfaces of the composites were observed on a scanning electron microscope. The results show that the wear mechanism on the condition of low load is adhesive wear, while the mechanism on the condition of high load is adhesive and fatigue wear. And under a certain load, whether the relative sliding linear velocity is high or low, the main wear mechanism is adhesive wear. The adhesive wear degree is increased at the high speed, and tearing marks are caused at some areas of the worn surfaces.