Tribological Properties of Polytetrafluoroethylene(PTFE) Composite Coating on Carbon-Carbon Composites

A self-lubricating polytetrafluoroethylene (PTFE) composite coating on the C/C composites with SiC interlayer was prepared by compression molding and sintering,and the friction and wear properties of the coating were measured.The results show that the friction coefficient of this composite coating reaches to 0.155,which is higher than that of the pure PTFE coating(0.105～0.16) and lower than C/C composites(0.18～0.23), and the friction property of the composite coating is more stable than that of the pure PTFE coating.In addition,the wear of the composite coating is about 2 percent of that of pure PTFE coating.Both abrasion and adhesion serve as the wear forms of the composite coating.