添加剂对硅溶胶结合Al_2O_3-SiC-C铁沟捣打料性能的影响

Effect of additives on properties of colloidal silica bonded Al_2O_3-SiC-C iron trough ramming mix

以特级矾土（粒径8～5、5～3和3～1 mm）、棕刚玉（粒径3～1、≤1和≤0．074 mm）、碳化硅（粒径≤1和≤0．074 mm）和球状沥青为主要原料，金属硅和碳化硼为抗氧化剂和促烧剂，添加超微粉或焦作黏土，以硅溶胶作结合剂，采用手工捣打成型工艺来制备 Al2 O3-SiC-C 铁沟捣打料。研究了硅微粉、α-Al2 O3微粉、焦作黏土和有机防爆纤维对硅溶胶结合 Al2 O3-SiC-C 铁沟捣打料性能的影响。结果表明：添加2％质量分数硅微粉、3％质量分数焦作黏土或0．05％质量分数有机防爆纤维对硅溶胶结合 Al2 O3-SiC-C 铁沟捣打料的体积密度影响不大。含9％质量分数α-Al2 O3微粉的试样和含6％质量分数α-Al2 O3微粉、3％质量分数焦作黏土的试样显示出更好的常温强度。合理的颗粒级配可以提高铁沟捣打料试样的抗高炉渣侵蚀性。含6％质量分数α-Al2 O3微粉、3％质量分数焦作黏土的试样的抗渣侵蚀性最好；含7％质量分数α-Al2 O3微粉、2％质量分数硅微粉的试样的抗渣侵蚀性次之；含9％质量分数α-Al2 O3微粉的试样的抗渣侵蚀性最差。有机防爆纤维提高了捣打料的烘后强度，但使抗渣性能有所降低。硅溶胶结合 Al2 O3-SiC-C 铁沟捣打料试样在1450℃煅烧后质量增加，有利于体积稳定性和抗渣性能。

The Al2 O3-SiC-C iron trough ramming mix was prepared using extra grade bauxite （particle size：8-5 ,5-3 and 3-1 mm）,brown corundum （particle size：3-1、≤1 and ≤0.074 mm）,silicon carbide （particle size：≤1 and ≤0.074 mm）and ball pitch as main starting materials,metallic silicon and boron carbide as antioxidant and sintering aid,adding ultra-micro powders or Jiaozuo clay,colloidal silica as binder,ramming and shaping.Effect of silica mi-cropowder,α-Al2 O3 micropowder,Jiaozuo clay and organic explosion-proof fiber on properties of colloidal silica bonded Al2 O3-SiC-C iron trough ramming mix were studied.The results show that：2% quality score silica mi-cropowder,3% quality score Jiaozuo clay or 0.05% quality score organic explosion-proof fiber has little influence on bulk density of colloidal silica bonded Al2 O3-SiC-C iron trough ramming mix;specimen with 9% quality score α-Al2 O3 micropowder,and the specimen with 6% quality score α-Al2 O3 micropowder and 3% quality score Jiaozuo clay exhibit better cold strength.Rational particle size distribution could improve the slag resistance of iron trough ramming mix specimen;specimen with 6% quality scoreα-Al2 O3 micropowder and 3% quality score Jiaozuo clay has the best slag resistance;specimen with 7% quality score α-Al2 O3 micropowder and 2% quality score silica mi-cropowder has the second place;and the specimen with 9% quality score α-Al2 O3 micropowder has the worst slag resistance.Organic explosion-proof fiber can improve the dried strength of ramming mix,but reduce slag resistance. The specimens of colloidal silica bonded Al2 O3-SiC-C iron trough ramming mix have mass increase after fired at 1 450℃,which can improve volume stability and slag resistance.