关键词: 铝硅系浇注料, 铝灰, 氧化铝含量, 抗侵蚀性

Abstract: To investigate their aluminum ash corrosion resistance,Al₂O₃-SiO₂ refractory castables were prepared using sintered mullite (grades SM45 and SM70) and white fused corundum as raw materials,and calcium aluminate cement as the binder.The aluminum ash corrosion resistance at 1 350 ℃ of the castables with different Al₂O₃ contents (44.26%,57.51%,69.61%,82.81% and 94.33%,by mass) was studied.The results show that:after corrosion,the strength of all samples declines,with the most striking decrease for the sample containing 69.61% Al₂O₃.During corrosion,cristobalite in the samples is corroded first,followed by mullite,and acicular corundum is formed.The sample with 69.61% Al₂O₃ exhibits the severest corrosion.The main effect of Na and Cl elements in aluminum ash on the samples during corrosion is infiltration.The higher the Al₂O₃ content in the samples,the better the infiltration resistance of the samples against Na,Cl and other elements from aluminum ash.The sample with 94.33% Al₂O₃ demonstrates the strongest resistance to aluminum ash corrosion,while the one with 69.61% Al₂O₃ shows the poorest corrosion resistance.

Key words: alumina-silica castables, aluminium ash, alumina content, corrosion resistance