CORROSION OF ALUMINOSILICATE REFRACTORIES BY MOLTEN ALUMINUM AND MELTS BASED UPON IT IN MELTING AND CASTING UNITS

摘要

Corrosion mechanisms are proposed for aluminosilicate refractories by molten aluminum taking account of new ideas about physicochemical reaction of molten aluminum with refractory. With a negative volumetric effect for aluminum reactions with components of aluminosilicate refractories reaction products will not form a continuous film, and with a positive volumetric effect the reaction products will split pores and cause material cracking. A porous aluminum oxide film will not be a barrier for the reaction of aluminum with refractory. The possibility for aluminosilicate refractories of wetting by molten aluminum and the size of pores permeable for penetration of molten aluminum in relation to presence or absence of antiwetting additions are determined.