Microstructure And Tribological Properties Of Pip-Sic Modified C/C-Sic Brake Materials

A combination method of precursor infiltration and pyrolysis (PIP), chemical vapor infiltration (CVI) and liquid silicon infiltration (LSI) was proposed to prepare PIP-SiC modified C/C?SiC brake materials. The SiC ceramic matrix pyrolyzed by polymethysilane (PMS) homogeneously dispersed in the fiber bundles region, which improved the plough resistance of local C/C region and the wear resistance of C/C?SiC brake materials. When the braking speed rises to 28 m/s, the fluctuation range of friction coefficient was limited to 0.026. The linear wear rate of the as-prepared composites was could be -50% less than that of C/C?SiC, when the braking speed was above 15 m/s (for instance, the wear rate of 1.02 ?m/(side?cycle) at 28 m/s less than 2.02 ?m/(side?cycle) of traditional C/C? SiC). The fading ratio D of CoF under wet conditions was -11%. The results showed that introducing PIP-SiC could stabilize the braking process and effectively prolong the service life of C/C?SiC brake materials.