Effect of MgO-CeO₂ additives on the densification and thermal conductivity of SiC multiphase ceramics with high SiC content

The densification and thermal conductivity of SiC-AlN multiphase ceramics with 80wt% SiC at different additives contents are investigated, in which the samples were sintered by hot pressing at 1850℃ with MgO-CeO₂ as sintering additives. A proper content of additives will benefit the sintering of SiC-AlN ceramics. There were plenty of pores in the samples as the content of additives was 6wt%. While the content of additives ranged from 8wt% to 14wt%, the densification of the samples were excellent. The multiphase ceramics reached the minimum porosity of 0.14% when 10wt% additives were added. As the content of additives was 8wt%, the thermal conductivity of the samples achieved the highest value of 51.72 W·m^-1·K^-1.