Al2O3-MgO-C refractories are developed on the basis of high-performance magnesia and aluminium carbonaceous refractories, which are also an alternative material to high-alumina and dolomite brick ladle lining. But in contrast, made by acid-based two kinds of fire-resistant oxides, the alumina magnesia carbon brick not only has excellent chemical and thermodynamic stability, but also has excellent thermal and mechanical properties.
(1) High penetration resistance to molten steel. The whole refractory lining can be formed by the expansion of spinel reaction between the alumina and the magnesia during use, effectively preventing the infiltration of the molten steel into bricks from the joint between bricks.
(2) Excellent slag resistance performance. In addition to the role of graphite, the spinel formation during using can absorb the FeO from slag to form a solid solution, and Al2O3 can react with the CaO of slag to form a CaO-Al2O3 compounds with high melting point, blocking the pores and increase Melt viscosity, to achieve the purpose of inhibiting slag penetration.
(3) High mechanical strength. Compared with MgO-C and Al2O3-C refractories, Al2O3-MgO-C refractories contain less graphite, usually 6% -12%, so its bulk density is high and with low porosity and high strength.