Abstract
The suitability of MgO as a densification additive for SiC was investigated. Dense and fine-grained SiC ceramics could be obtained by hot-pressing at 1900°C with addition >1mass% (and up to 29mass%) of MgO. X-ray diffraction (XRD) analysis of the SiC ceramics showed little reaction between SiC and MgO except for formation of small amount of Mg2SiO4, which indicated the presence of a liquid phase at high temperature. XRD analysis also showed the transformation from 3C-SiC to 4H-SiC during hot-pressing. The grain sizes of the SiC sintered with 2-29mass% MgO were almost the same and in the range of 100-300nm. Mechanical properties, thermal conductivity and electrical properties of these ceramics were measured and discussed in relation to their microstructure.
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