Effects of SiO2 formed on SiC filler particulates on the thermal and mechanical properties of a SiC/Si–C–N composite

摘要

SiO₂ surface layer of SiC filler particles decreased thermal stability and creep resistance of particulate-reinforced Si–C–N-based ceramic composites made by precursor-impregnation and pyrolysis (PIP) method due to the decomposition of SiO₂ at and above 1350°C. The oxide layer could be removed by a pre-treatment of SiC particle compact at 1750°C in Ar before precursor impregnation. The composites fabricated with pre-treated SiC compact show clear improvements in thermal stability and creep resistance.