纳米SiO_2颗粒和玻璃微珠共混改性超高分子量聚乙烯复合材料的摩擦磨损性能

Friction and Wear Properties of Nano-SiO_2 Particles and Glass Microballoons Modified Ultrahigh Molecular Weight Polyethylene Composite

采用模压成型工艺制备了纳米SiO2颗粒和玻璃微珠共混改性的超高分子量聚乙烯复合材料;研究了相对滑动速度、载荷以及玻璃微珠含量对复合材料摩擦磨损性能的影响,并对磨损形貌和磨损机理进行了分析。结果表明:添加纳米SiO2颗粒和玻璃微珠可以提高复合材料的硬度、压缩弹性模量和摩擦磨损性能;相对滑动速度对复合材料摩擦因数和磨损率有很大的影响;载荷对复合材料的摩擦因数影响不明显,但磨损率随载荷的增加而增大;纳米SiO2颗粒和玻璃微珠混合改性后复合材料的磨损机理主要是粘着磨损和疲劳磨损。

The ultrahigh molecular weight polyethylene （UHMWPE） composite modified by nano-SiO2 particles and glass microballoons was prepared by compression molding. The effects of relative sliding speed, load and glass microballoon content on friction and wear properties of the composite were studied, and the wear morphology and mechanism were analyzed. The results show that adding nano-SiO2 particles and glass microballoons could enhance the hardness, compressive elastic modulus and friction and wear properties of the composite. The relative sliding speed had a great effect on friction coefficient and wear rate of the composite, and the effect of load on friction coefficient of the composite was not obvious, but the wear rate increased with the increase of load. The main wear mechanism of the composite modified by nano-SiO2 and glass microballoons was adhesive wear and fatigue wear.