Corrosion process of a high alumina brick exposed to the molten iron at temperatures between 1500 and 1650℃ was studied. Microstructure of the brick was analyzed by the SEM and the EDS to clarify the corrosion process. The corroded zone of the brick by the molten pig iron has been characterized by the extinction of the SiO_2 component and the existence of metallic iron. On the other hand in the corroded zone by the steel, the coexistence of alumina and the Al-Si-Fe-0 system glassy phases was observed. Analysis based on the thermodynamic equilibrium of reaction in the system suggested that the SiO_2 from the mullite phase and the matrix of the brick was preferentially corroded by the carbon in the molten iron.
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