Abstract: To improve the thermal shock resistance of corundum-spinel castables,samples were prepared using white fused corundum aggregates (5-3,3-1,and ≤1 mm) and fine powder (≤0.074 mm),microporous corundum aggregates (5-3,3-1,≤1 mm),sintered spinel aggregates (≤1 mm) and fine powder (≤0.045 mm),BL-2 alumina micropowder,and Secar 71 calcium aluminate cement as raw materials.The effects of different heat treatment temperatures (1 000,1 200,1 400,1 500,and 1 600 ℃) and the equivalent replacement amount of white fused corundum with microporous corundum aggregates of the same particle size (0,13%,23%,33%,43%,and 54%,by mass) on the properties of the samples were investigated.The results show that:(1)as the heat treatment temperature increases,the strength of the samples increases accordingly;(2)with the microporous corundum aggregate addition increasing,the bulk density decreases,and the thermal shock resistance first decreases and then increases;(3)when the microporous corundum aggregates completely replace the white fused corundum aggregates,at the addition of 54% and heat treatment temperature of 1 600 ℃,the sample exhibits the optimal overall performance.

Key words: corundum-spinel castables, densification, microporous corundum, thermal shock resistance

摘要： 为了提升刚玉-尖晶石浇注料的抗热震性,以电熔白刚玉骨料(5~3、3~1、≤1 mm)及细粉(≤0.074 mm),微孔刚玉骨料(5~3、3~1、≤1 mm),烧结尖晶石骨料(≤1 mm)及细粉(≤0.045 mm),BL-2氧化铝微粉,Secar 71铝酸钙水泥为原料,制备刚玉-尖晶石浇注料。研究了不同热处理温度(1 000、1 200、1 400、1 500、1 600 ℃)和同粒度的微孔刚玉骨料等量替换电熔白刚玉的加入量(质量分数分别为0、13%、23%、33%、43%、54%)对试样性能的影响。结果表明:1)随着热处理温度的升高,试样的强度随之增大;2)随着微孔刚玉骨料加入量的增加,体积密度降低,抗热震性先减小后增大;3)当微孔刚玉骨料完全取代电熔白刚玉骨料,即微孔刚玉骨料加入量为54%(w),热处理温度为1 600 ℃时,试样的综合性能最佳。

关键词: 刚玉-尖晶石浇注料, 致密度, 微孔刚玉, 抗热震性