采用高速机械搅拌的方式充分混合原料,然后用模具将混合好的材料冷压成型,再通过一定的烧结程序制备不同体积含量的聚醚醚酮(PEEK)和纳米TiO2协同填充改性的聚四氟乙烯(PTFE)复合材料试样。利用MR H-3摩擦磨损实验机在不同实验条件下对试样进行摩擦学性能的测试。磨损后用 Quanta FEG450扫描电镜对钢环表面的摩擦形貌进行观察与分析。实验结果表明,填充 PEEK 可大幅降低 PTFE复合材料的体积磨损率,但复合材料的摩擦系数却随PEEK含量的增加而表现出逐渐上升的趋势。用不同含量的纳米TiO2填充10％PEEK/PTFE,摩擦系数和体积磨损率都表现出随纳米 TiO2含量的增加而逐步上升的趋势,其中2％Nana-TiO2/10％PEEK/PTFE复合材料的摩擦系数和体积磨损率最小。当滑动速度和载荷分别超过2 m/s和200 N后对复合材料的磨损率有显著地影响,而环境温度在25~120℃范围内变化对磨损率和摩擦系数的影响均不明显。
The PEEK and Nano-TiO2 particles synergetic filled PTFE composites were prepared by blending ma-terial with high speed mechanical mixer,cold press molding and sintering with temperature control program. The tribological behavior of composites was tested on different test conditions by a MRH-3 block-on-ring fric-tion and wear tester.After testing,the transfer film on counterpart GCr1 5 ring was inspected and anslyzed with Quanta FEG450 scanning electronic microscopy (SEM).The results show that the special wear rate of compos-ites filled with PEEK decreases dramatically and the friction coefficient increases gradually with the increasing content of PEEK.When 10%PEEK/PTFE composite is filled with different contents of Nano-TiO2 particles, the wear rate and the coefficient friction increase moderately with the increasing contents of nanoparticles.The lowest wear rate and coefficient friction are gained when the composite filled with 2%nano-TiO2 and 10%PEEK. Sliding speed and load,respectively,more than 2 m/s and 200 N has significantly effect on the wear rate,and ambient temperature at 25 to 120 ℃ within the scope of the impact on the volume wear rate and friction coeffi-cient are not obvious.
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