Influence of Oxidation Inhibitor on Carbon-Carbon Composites: 6. Studies on Friction and Wear Properties of Carbon-Carbon Composites

The friction and wear properties of carbon-carbon composites made with different weight percent of as an oxidation inhibitor were investigated using a constant speed wear test apparatus in an oxidation environment. The results indicated the carbon-carbon composites undergoing an abrupt transition of friction coefficient, from low-friction behavior(=0.15~0.2) during normal wear regime to the high-friction behavior(=0.5~0.6) during dusting wear regime at the frictional temperature range of 150~180. The existence of temperature-dependent friction and wear regimes implied that the performance of specimen made with carbon-carbon composites was markedly affected by the thermal properties of the composites. The carbon-carbon composites filled with MoSi2 exhibited two times lower coefficient of friction and wear rate in comparison with the composites without . Especially, the composites containing 4wt% filler showed a significantly improved activation energy for wear due to the reduction of both the porosity and powdery debris film formation on sliding surface when compared to those without .