Influence of SiO2 on the Interfacial Reaction between MgAl2O4 Substrate and Molten Iron

Abstract

The influence of SiO2 on the interfacial reaction between MgAl2O4 substrate and molten iron has been investigated as a basic research study for the wear of refractories. Substrates which were made from MgO, Al2O3 and SiO2 powders consisted of spinel and MgO－Al2O3－SiO2 amorphous. The iron sample was put on the substrate and interfacial reaction between molten iron and substrate was examined at 1833K for 1 or 3h. In the case using SiO2 free substrate, the FeO－MgO solid solution was formed at the iron－substrate interface and oxygen in molten iron transferred into spinel as FeO. In the case using substrate with SiO2 addition of 2.5 or 5.0 mass％, the FeO－MgO solid solution was not formed at the interface and FeO content of MgO－Al2O3－SiO2 amorphous was more than that of spinel.