不同摩擦条件对PEEK、CF/PEEK复合材料摩擦学性能及其抗静电性能的影响

The effects of different friction conditions on the tribological and antistatic properties of PEEK and CF/PEEK composites

采用快速热压烧结法制备了聚醚醚酮(PEEK)及碳纤维改性聚醚醚酮(CF/PEEK)复合材料。利用多功能摩擦磨损试验机UMT-2对所制备的纯PEEK及CF/PEEK复合材料进行摩擦性能表征,系统研究载荷和速度对PEEK及其复合材料摩擦学性能、磨损机理及抗静电性能的影响。利用三维形貌仪、扫描电子显微镜、静电测试仪等手段对材料磨损表面及摩擦静电进行分析和表征。结果表明:随着载荷的增加,PEEK和CF/PEEK达到稳定阶段的平均摩擦系数先降低后增加;PEEK和CF/PEEK复合材料表面磨损率逐渐增大,施加载荷为100N和125N时,纯PEEK材料表面磨损失效,磨损机制以粘着磨损为主向疲劳磨损为主转变。随着速度的增加,PEEK平均摩擦系数先增加后降低,CF/PEEK平均摩擦系数先略微降低后逐渐增加;PEEK和CF/PEEK复合材料表面磨损率先降低后增加;在低速条件下,磨损机理以磨粒磨损为主,高速条件下,磨粒磨损和粘着磨损共同存在。PEEK和CF/PEEK复合材料表面摩擦静电分别随着载荷、速度的增加而逐渐增加。

Polyether ether ketone(PEEK)and carbon fiber(CF/PEEK)composites were prepared by hot pressing sintering method.The friction properties of PEEK and CF/PEEK were characterized by multifunctional friction and wear testing machine UMT-2.The effects of load and velocity on the tribological properties,wear mechanism and the antistatic properties of the composites were systematically studied.The surface morphology and antistatic properties of the composites were measured by 3D morphometer,scanning electron microscope and friction electrostatic tester.The results showed that,with the increase of load,the average friction coefficient of PEEK and CF/PEEK at the stable stage first decreased and then increased.Meanwhile,the wear rate of PEEK and CF/PEEK increased as the load increased.When the load went up to 100N and 125N,the wear failure occurred on pure PEEK.The dominant wear mechanism changed from adhesive wear to fatigue wear.With the velocity increasing,the average friction coefficient of PEEK first increased and then decreased,and that of CF/PEEK first decreased slightly and then increase gradually.However,the wear rate of PEEK and CF/PEEK first decreased and then increased as the velocity increased.At low speed,the wear mechanism was mainly abrasive wear,while abrasive wear and adhesive wear coexisted at high speed.The surface tribostatic electricity of PEEK and CF/PEEK composites increased gradually with increasing of load and speed,respectively.