High thermal conductivity of spark plasma sintered silicon carbide ceramics with yttria and scandia

A fully dense SiC ceramic with a room-temperature thermal conductivity of 262 W·(m·K)−1 was obtained via spark plasma sintering β-SiC powder containing 0.79 vol% Y2O3-Sc2O3. High-resolution transmission electron microscopy revealed two different SiC-SiC boundaries, that is, amorphous and clean boundaries, in addition to a fully crystallized junction phase. A high thermal conductivity was attributed to a low lattice oxygen content and the presence of clean SiC-SiC boundaries.

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