Reaction of silicon carbide, which is constituent one of the refractory, has been examined, as a basic research on the life-lengthen of the refractory. Fe-4.3mass% C alloy was put on silicon carbide, and those were heated up to 1200-1500℃. In the interface of Fe-C alloy and SiC substrate, the reaction layer with metallic luster was formed. It was proven that the reaction layer had separated into upper and lower layers and both layers also consisted of Fe-Si-C metallic phase and graphite grains. It was guessed that the upper layer was liquid phase temporarily and the lower layer was formed by the solid phase reaction. In the experiments of 1400℃ and 1500℃, Si concentration of Fe-Si-C metallic phase reached 15-16mass%. The peeling has been generated over the whole interface between reaction layer and SiC substrate, and this result is supposed the large failure for the life-lengthen of the refractory.

View full abstract