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

摘要： 为探究铝硅系耐火浇注料抗铝灰侵蚀性能,以不同牌号(SM45、SM70)的烧结莫来石和电熔白刚玉为原料,以铝酸钙水泥为结合剂,制备了铝硅系浇注料。研究了不同Al₂O₃含量(Al₂O₃质量分数分别为44.26%、57.51%、69.61%、82.81%、94.33%)的铝硅系浇注料在1 350 ℃时的抗铝灰侵蚀性能。结果表明:经铝灰侵蚀后,所有试样的强度都呈现出下降的趋势,其中Al₂O₃质量分数为69.61%的试样强度下降最为显著;在侵蚀过程中,试样的方石英相先被侵蚀,其次是莫来石相,并生成针状刚玉,其中Al₂O₃质量分数为69.61%的试样受侵蚀最为严重;铝灰中的Na、Cl元素在侵蚀过程中对试样的作用主要是渗透,试样中的Al₂O₃含量越高,试样抗铝灰中Na、Cl等元素渗透的能力越好;Al₂O₃质量分数为94.33%的试样抗铝灰侵蚀能力最强,Al₂O₃质量分数为69.61%的试样抗铝灰侵蚀性能最差。

关键词: 铝硅系浇注料, 铝灰, 氧化铝含量, 抗侵蚀性