Effect of Al4SiC4 addition to carbon-containing refractories

Abstract

The behavior and the effect of Al4SiC4, an excellent hydration-resistant compound, as an antioxidant for carbon-containing refractories have been investigated, and the corresponding mechanisms have been discussed. Al4SiC4 added to the refractories initially reacts with CO to form Al2O3, SiC and C. After the reaction, if the temperatures are below approx.1560°C, the formed SiC and Al2O3 will further react with CO to form mullite (Al6Si2O13) and C. The above reaction processes can form protective layers on the surfaces of the refractories, which inhibit the oxidation of the refractories. From the results obtained, Al4SiC4 was found to markedly inhibit the oxidation of the carbon-containing refractories.