关键词: 刚玉-尖晶石浇注料, 致密度, 微孔刚玉, 抗热震性

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