Abstract:

Al₂O₃-SiC-C iron trough castables were prepared using brown corundum,silicon carbide,α-Al₂O₃ micropowder,SiO₂ micropowder,and different calcium aluminate cements as raw materials to study the influence of cements (CA50,CA70,Vical71,and Vical21) on their properties.The results show that with the Al₂O₃ and SiO₂ content increasing,CaO and other impurities content decrease in the cements,for the specimens,the apparent porosity after drying at 110 ℃ decreases gradually,and the apparent porosity after heat treatment at 1 450 ℃ decreases at first and then increases,the bulk density in the two conditions both changes slightly;the cold strengths after drying decrease firstly and then increase,the cold strength after heat treatment,the hot modulus of rupture,and the slag corrosion resistance enhance gradually.Considering both the laboratory and the industrial results,Vical21 cement is the best choice.

Key words: alumina-silicon carbide-carbon iron trough castables, calcium aluminate cement, hot modulus of rupture, slag corrosion resistance

摘要：

以棕刚玉、碳化硅、α-Al₂O₃微粉、SiO₂微粉及不同种类的铝酸钙水泥等为原料,制备了Al₂O₃-SiC-C质铁沟浇注料,研究了铝酸钙水泥种类(水泥CA50、CA70、Vical71、Vical21)对浇注料性能的影响。结果表明:引入CA50、CA70、Vical71、Vical21四种铝酸钙水泥的试样,随所含水泥中Al₂O₃和SiO₂总含量的增加,CaO及其他杂质含量的减少,110 ℃干燥后的显气孔率降低,1 450 ℃热处理后的显气孔率先减小后增大,两条件下体积密度的变化幅度均较小;干燥后的常温强度先减小后增大,热处理后的常温强度、高温抗折强度、抗渣性能均逐渐增大。综合实验室和工业试验结果考虑,选用水泥Vical21,使用效果最好。

关键词: Al₂O₃-SiC-C质铁沟浇注料, 铝酸钙水泥, 高温抗折强度, 抗渣性能