Friction and Wear Properties of PTFE Braided Composites under High-speed Condition

The dry friction-wear test for PTFE braided composites and 9Cr18Mo steel friction pair was carried out on high-speed pressing and swing tribo-tester. The effects of cycle number and friction temperature on friction coefficient of PTFE braided composites were studied. The morphology of friction surface and abrasive debris in different stages was characterized by scanning electron microscopy. The results show that with the increasing of cycle number the friction coefficient of PTFE braided composites decreases, then reaches a dynamic balance. With the friction process, the friction coefficient rises sharply, and wear failure of the composites occurs. The friction temperature is an important factor of the influence on friction and wear mechanism for PTFE braided composites. The rapid rise of friction temperature can aggravate the wear of PTFE composites. With the intensification of wear, wear debris also shows a corresponding deterioration. The wear mechanism is mainly fatigue wear.