Abstract
Improvement of the corrosion resistance of refractories is required critically, since Al2O3 based conventional refractories used for incineration at the power generation plants are seriously corroded by the molten oxide mixture. In this study, the effect of the addition of Cr2O3 to Al2O3 on the corrosion resistance, and the corrosion behavior of Cr2O3–Al2O3 system are investigated in the molten oxide. Cr2O3–Al2O3 ceramic materials with TiO2 as a sintering additive were used for the corrosion tests. Specimens were soaked into the SiO2–CaO–Al2O3 based molten oxide and rotated. The corrosion rate of the material is controlled by the diffusion of components of Cr2O3–Al2O3 through the boundary layer. The corrosion resistance was improved by addition of Cr2O3. The largest improvement was achieved when the addition of Cr2O3 was 81.6 mol%. It can be explained by the difference of diffusion rate of Cr3+ and Al3+.
