表面织构对PTFE复合材料摩擦磨损行为的影响

Effect of Surface Texture on Friction and Wear Behavior of PTFE Composites

为了研究表面织构对聚四氟乙烯(PTFE)复合材料摩擦磨损性能的影响规律及其作用机理,采用BBD响应面法对试验进行设计与分析,利用LSR-2M往复摩擦试验机测试了复合材料的摩擦学性能,建立了织构参数与摩擦系数和体积磨损率之间的二次回归模型,研究了槽宽、间距和角度参数及其交互作用对复合材料摩擦学性能的影响.结果表明:二次回归模型显著,拟合精度分别为82.9%和83.2%,预测出槽宽323.2μm、间距295.4μm、角度88.7°时摩擦系数存在最小值0.147,槽宽331.1μm、间距307.6μm、角度87.6°时体积磨损率存在最大值8.11×10^-5 mm^3/(Nm);织构增大了初始摩擦系数和体积磨损率,但有利于储存磨屑,在接触应力作用下磨屑中的纳米粒子与槽底及侧面的粗糙峰形成了机械互锁,提高了磨屑的附着力,促进了转移膜的生成.

In order to study the effect of counterpart surface texture on the friction and wear properties of PTFE composites and its mechanism,the BBD Response Surface Method was used to design the tests and analyze the test data,and the LSR-2M reciprocating friction tester was used to conducte the tests.After that a quadratic regression model between texture parameters and friction coefficient/volume wear rate was established.The effects of groove width,groove spacing,friction angle and their interaction on the tribological properties of the composites were investigated.The results showed that the quadratic regression model was significant,and the fitting accuracy reached 82.85%and 83.21%.It was predicted that the friction coefficient had a minimum value of 0.147 when the groove width was 323.2μm,the groove spacing was 295.4μm,the angle was 88.7°.The volume wear rate had a maximum value of 8.11×10^-5 mm^3/(Nm)when the groove width was 331.1μm,the groove spacing was 307.6μm and the angle was 87.6°.Surface texture increased the initial friction coefficient and the volume wear rate,but it was beneficial to the storage of the wear debris.Under the action of contact stress,a strong mechanical interlocking force was formed between the nanoparticles contained in the debris and the rough peaks at the bottom and sides of the groove,which improved the adhesion of the debris and promoted the formation of the transfer film.