Effects of zirconium addition on microstructure and ablation resistance of carbon fibre reinforced carbon and SiC ceramic matrix composite prepared by reactive melt infiltration

摘要

Carbon fibre reinforced C and SiC binary ceramic matrix composites (C/C-SiC) were fabricated by a quick and low cost reactive melt infiltration (RMI) method with Si-Zr25 and Si melts. Effects of zirconium addition in infiltrated Si melt on microstructure and ablation resistance of the composite were investigated. The composite by Si-Zr25 melt infiltration was composed of SiC, ZrC, C and a little amount of ZrSi_2 without residual silicon, overcoming the problem of residual silicon in C/C-SiC composite by Si RMI. Compared with the composite by Si melt infiltration, the ablation resistance of the composite by Si-Zr25 was greatly improved by zirconium addition due to ZrO_2 and SiO_2 protecting layer formed during ablation.