Hydration Resistances and Reactions with CO of Al₄O₄C and Al₂OC Formed in Carbon-Containing Refractories with Al

Abstract

Two of the fundamental properties of carbon-containing refractories with Al, hydration resistances and reactions with CO of Al₄O₄C and Al₂OC formed in the refractories at high temperatures were investigated. Al₄O₄C is formed from a mixture of Al₂O₃:Al:C=4:4:3 (molar ratio) above 1300°C. Al₂OC is formed from a mixture of Al₂O₃:Al:C=1:4:3 (molar ratio) above 1400°C. The hydration resistances of Al₄O₄C and Al₂OC are much better than that of Al₄C₃. Al₄O₄C and Al₂OC react with CO to form Al₂O₃ and C at temperatures above 900°C.