Thermal conductivity of alumina and silicon carbide ceramics at low temperatures

Abstract

Thermal conductivity is measured on AI 2O 3 ceramic, structural SiC and high thermal conductivity SiC (2 wt% BeO addition) ceramics at a temperature range of 4–300 K. These ceramics possess conductivity maxima, the values of which are 0.9 W cm −1 K −1at ≈ 80 K for AI 2O 3; 4 W cm −1 K −1at ≈ 100 K for high thermal conductivity SiC; and 0.65 W cm −1 K −1at ≈150 K for structural SiC.