Abstract
Al2O3–SiC–SiO2–C composites are widely used in ironmaking operations due to their favorable erosion-resistance. In the present paper, the oxidation behavior and kinetics of Al2O3–SiC–SiO2–C composites in air are investigated in terms of a theoretical analysis associated with the experimental data. Furthermore, the effects of temperature on the oxidation reaction are discussed. The results show that the oxidation of Al2O3–SiC–SiO2–C composites is mainly caused by atmospheric oxygen reacting with C and SiC in the materials. At 1200°C, a protective layer can be found on the material surface due to the formation of the mullite phase. Predictions from the Chou model are in agreement with the experimental data. The characteristic oxidation time which indicates anti-oxidation properties for Al2O3–SiC–SiO2–C composites at 1000°C and 1200°C are 142.41min and 264.89min, respectively, indicating that the material at 1200°C is more resistant to oxidation due to the formation of a protective layer on the surface.
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