Phase Transformation and Thermal Conductivity of Hot‐Pressed Silicon Carbide Containing Alumina and Carbon

Abstract

Phase transformation and thermal conductivity of hot‐pressed β‐SiC with Al 2 O 3 and carbon additions were studied. Densification rate was a complex function of both Al 2 O 3 and carbon. Simultaneous additions of Al 2 O 3 and carbon accelerated the 3C → 4H phase transformation. Carbon additions lowered the thermal conductivity of the compact as did the high‐temperature hot‐pressing. The 3C → 4H transformation and the thermal conductivity were deduced to be related to each other.