Abstract
The effect of grain growth on the thermal conductivity of SiC ceramics sintered with 3vol% equimolar Gd2O3-Y2O3 was investigated. During prolonged sintering at 2000°C in an argon or nitrogen atmosphere, the β→α phase transformation, grain growth, and reduction in lattice oxygen content occurs in the ceramics. The effects of these parameters on the thermal conductivity of liquid-phase sintered SiC ceramics were investigated. The results suggest that (1) grain growth achieved by prolonged sintering at 2000°C accompanies the decrease of lattice oxygen content and the occurrence of the β→α phase transformation; (2) the reduction of lattice oxygen content plays the most important role in enhancing the thermal conductivity; and (3) the thermal conductivity of the SiC ceramic was insensitive to the occurrence of the β→α phase transformation. The highest thermal conductivity obtained was 225 W(mK)−1 after 12h sintering at 2000°C under an applied pressure of 40MPa in argon.
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