The influence of BaO additives on the reaction of Al2O3–SiO2 ceramics with molten Al and Al–Si alloys Original Research Article

BaO considerably affects the composition and the microstructure of the reaction zone formed between BaO-doped aluminosilicate ceramics and molten aluminium alloys under vacuum. The reduced Ba and Si form AlBaSi precipitates, found adhered to the interface and dispersed in the metal Al-matrix, whose formation apparently controls the reaction kinetics.