Abstract
AbstractOur previous research showed that the addition of andalusite aggregates can enhance the oxidation resistance of Al2O3‐SiC‐C castables; this is attributed to the transformation of andalusite into a silica‐rich glass phase that blocks pores. Theoretically, andalusite with a smaller particle size would achieve a higher extent of conversion and generate more silica‐rich glass, which would be more conducive to blocking pores. Therefore, this study evaluates the influence of andalusite fine powder on the oxidation resistance of Al2O3‐SiC‐C castables containing a reduced amount of Si antioxidant. The results show that introducing a small amount of andalusite fine powder endows the Al2O3‐SiC‐C castables with significant oxidation resistance so that the traditional addition of Si metal as an antioxidant can be substantially reduced or even completely eliminated. Meanwhile, the thermal shock stability and strength of the castables were also enhanced.
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