PTFE编织复合材料摩擦特性研究

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The dry friction tests of PTFE braided composites were carried out on high-speed tribo-tes er with speed, load as variables. The influence of different speed, load on the friction coefficient were analyzed. The results show that friction coefficient is stable reducing trend and finally stabilized with increasing load. Friction coefficient with the speed of change trend is： between 10-20kN, with increasing of the frequency, friction coefficient gets a minimum value and then rises to a steady value. The influence of the load on the friction coefficient is greater than that of frequency on the friction coefficient. Through the analysis of the microstructure of the liner using scanning electron microscope, the influences mechanism of speed, load on the friction coefficient was explained.在高速摩擦磨损试验机上以摆动频率、载荷为变量对PTFE编织复合材料进行于摩擦性能测量实验,分析摆动频率、载荷对摩擦因数的影响规律。结果表明：材料的摩擦因数随载荷增大呈稳定降低趋势,最后趋于平稳。在20～40kN载荷范围内,摩擦因数随摆动频率的增大经过一个最小值后上升到稳定值。载荷对摩擦因数的影响大于频率的影响。通过扫描电子显微镜对不同载荷频率下产生的PTFE编织复合材料转移膜的分析,从微观上解释了摆动频率、载荷影响PTFE编织复合材料摩擦因数的作用机理。