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

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 323.2 μm, the groove spacing was 295.4 μm, the angle was 88.7°. The volume wear rate had a maximum value of 8.11×10⁻⁵ mm³/(Nm) when the groove width was 331.1 μm, the groove spacing was 307.6 μm 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.