聚丙烯、炭黑和碳纤维共混填充超高分子量聚乙烯复合材料的力学和摩擦磨损性能

采用模压成型的方式制备超高分子量聚乙烯(UHMWPE)复合材料,通过AG-1型电子万能实验机和MM-200型摩擦磨损试验机分别研究填料对复合材料力学性能和摩擦磨损性能的影响,采用光学显微镜分析复合材料磨损表面的形貌。结果表明:聚丙烯(PP)和无机填料炭黑(CB)或CB与碳纤维(CF)混杂填料的加入使UHMWPE复合材料的拉伸强度降低,弯曲模量和硬度增加,其中UHMWPE/PP/CB/CF复合材料的弯曲模量和硬度增幅大于UHM-WPE/PP/CB复合材料。填料的加入可改善UHMWPE复合材料的摩擦磨损性能,当填料的质量分数为5%时,UHMWPE复合材料的摩擦磨损性能最好,且UHMWPE/PP/CB/CF复合材料的耐磨性能优于UHMWPE/PP/CB复合材料。与UHM-WPE相比,UHMWPE/PP/CB/CF复合材料的摩擦因数和磨痕宽度分别下降了10%和44%,UHMWPE/PP/CB复合材料则分别下降了12%和42%。光学显微镜观察表明填料的加入大大改善了UHMWPE的磨粒磨损,复合材料表面以较浅的犁沟磨损为主要特征。

Friction and Wear Properties of Polypropylene,Carbon Black,Carbon Fiber Filled UHMWPE Composite

UHMWPE composites were prepared by molding method.Effect of fillers on mechanics,friction and wear properties of UHMWPE composites was investigated using an AG-1 mechanical tester and MM-200 wear tester.The worn surfaces of UHMWPE composites were analyzed with optical microscope.The results show addition of polypropylene(PP),carbon black or PP and carbon black and carbon fiber can lead the tensile strength of composites to decrease,the bend modulus and hardness to increase,and can improve the friction and wear properties of UHMWPE composites.When content of fillers is 5%,the friction coefficient and wear width of UHMWPE/PP/CB/CF and UHMWPE/PP/CB composites respectively decrease 10%,44% and 12%,42% compared with UHMWPE.The addition of fillers reforms the debris wear characteristic of UHMWPE and the worn surfaces of UHMWPE composites present furrow wear characteristic from optical microscope.