Abstract: Based on the study of the oxidation resistance of Al2O3-SiC-C iron trough castables, the effects of B4C and Si on the microstructure and properties of the castables were systematically studied. The results show that with the increase of B4C content，the oxidation resistance and compactness of castables were improved，and mechanical properties，slag corrosion and penetration resistance were significantly elevated. However，the excessive addition of B4C can increase the formation of low viscosity liquid phase containing boron and reduce the slag corrosion resistance of castables. The addition of Si and the compounding of silicon powders with different particle sizes are conducive to the improvement of compactness and oxidation resistance of castables. Controlling the amount of small particle size simple silicon and reducing the formation of low melting point composite silicate liquid phase is conducive to maintaining the excellent oxidation resistance，mechanical properties and slag corrosion resistance of castables.

Key words: Al2O3-SiC-C castable, Antioxidant, Mechanical properties, Slag corrosion resistance