Doping of alumino-silicate crucibles with MgO, CaO, or BaO aimed for improving their performance towards Al-alloy melts in aluminium foundry industry. Depending on the particular oxide, doping considerably affects microstructure and crystalline state of resulting ceramics, as well as interfacial reactions with Al-alloys at elevated temperatures. Analysis of reaction features, in terms of reaction zone structure, mechanism and kinetics, for each particular doping oxide, indicates that reaction intensity and kinetics follow the order MgO>BaO>CaO.