Friction and Wear Properties of Carbon/Carbon Composites under Different Braking Pressure

Friction and wear properties of C/C composites with rough laminar (RL) and smooth laminar(SL) microstructure under different braking pressures were studied. In order to inquire into the worn mechanisms, the morphology of worn surfaces and wear debris were observed through scanning electron microscopy and the graphitization degree of worn surface were examined by X-ray diffraction and Raman spectrum. The results show that with the increase of braking pressure, the coefficient of friction shows the trend of decrease, but the mass loss shows the trend of increase; the friction and wear properties of C/C composites with RL pyrolytic carbon can maintain fairly well even under the largest braking pressure; the graphitization degrees of worn surfaces increases with braking pressure, which is caused by the shear stress assisting graphitization; the increase of graphitization degree is helpful to the decrease of friction.