Thermal Conductivity of Alumina and Silicon Carbide Ceramics at Low Temperatures

Abstract

Thermal conductivity is measured on Al₂O₃ ceramic, structural material SiC and high thermal conductivity SiC (2wt% BeO addition) ceramics at a temperature range of 2 to 300K. On the conductivity, these ceramics possess maxima, which are 0.9Wcm^-1⋅K^-1 at -80K for Al₂O₃; 4Wcm^-1⋅K^-1 at -100K for high thermal conductivity SiC; and 0.65Wcm^-1⋅K^-1 at -150K for structural material SiC.