Abstract
SiC–BN ceramic matrix composites (SiC–BN CMCs) were in situ synthesized, using Si 3N 4, B 4C and carbon as reactants. Thermal shock resistance of in situ SiC–BN composites was investigated by measuring strength retention after varying temperature difference (Δ T) up to 1100 °C and compared with that of monolithic SiC. Monolithic SiC showed rapidly drop in flexural strength above Δ T of 900 °C, while SiC–BN composites showed an increase or negligible reduction in flexural strength till Δ T equal to 1100 °C, showing a great improvement of thermal shock resistance.
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