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Microstructure and Thermal Conductivity of Silicon Carbide with Yttria and Scandia

2013; Wiley; Volume: 97; Issue: 3 Linguagem: Inglês

10.1111/jace.12737

1551-2916

Young‐Wook Kim, Kwang‐Young Lim, Won‐Seon Seo,

Concrete and Cement Materials Research

A fully dense SiC ceramic with high thermal conductivity was obtained by conventional hot pressing, with 1 vol% Y 2 O 3 – Sc 2 O 3 additives. The ceramic had a bimodal microstructure consisting of large and small equiaxed SiC grains. Observation with high‐resolution transmission electron microscopy ( HRTEM ) showed two kinds of homophase ( SiC / SiC ) boundaries, that is crystallized and clean boundaries, and a fully crystallized junction phase. The thermal conductivity of the SiC ceramic was 234 W (m·K) −1 at room temperature. The high thermal conductivity was attributed to a clean SiC lattice and good contiguity between SiC grains.