Dependence of Corrosion Rate of Alumina-Chromia on Properties of Molten Slags

Abstract

Al₂O₃ based conventional ceramic materials used for incineration at power generation plants can be seriously corroded by molten oxide mixture. Therefore, it has been necessary to determine the ceramics component that makes Al₂O₃ based ceramics more stable in molten slag. We found that Cr₂O₃–Al₂O₃ based ceramic materials exhibited superior corrosion resistance in the molten slag even though their durability is still insufficient. The aim of this study is to develop a more stable ceramic material in molten oxides. The corrosion behavior of the candidate material Cr₂O₃–Al₂O₃ ceramics was investigated in detail in CaO–SiO₂–B₂O₃ melts, especially as a function of the basicity and viscosity of the melt. The basicity and viscosity represent the chemical and physical properties of the oxide melt, respectively.