为了改善刚玉-尖晶石浇注料的高温性能,以质量分数分别为10%的15 ~8 mm的白刚玉、58%的≤8 mm的白刚玉、5%的≤0.08 mm的白刚玉、14%的≤0.045 mm的白刚玉、9%的α-Al2O3微粉、4%的水泥制备了刚玉-尖晶石浇注料.在固定以5%(w)的≤0.048 mm的烧结尖晶石等量替代≤0.045 mm的白刚玉基础上,研究≤0.038 mm的烧结尖晶石等量替代≤0.045 mm的白刚玉的加入量(质量分数分别为1%、3%、5%和7%)对刚玉-尖晶石浇注料性能的影响.结果表明:烧结尖晶石细粉的添加可以改善材料的高温抗折强度和抗热震性能,并且在≤0.038 mm的烧结尖晶石细粉加入量为5%(w)时,试样的高温抗折强度最高,抗热震性最好.分析认为,刚玉在烧结尖晶石细粉中的固溶作用,对试样的高温性能影响较大.%To improve the high temperature performance,the corundum-spinel castables were prepared using white corundum(15 -8 mm,10 mass%;≤8 mm,58 mass%;≤0.08 mm,5 mass%;and ≤0.045 mm,14 mass%),9 mass% of α-Al2O3micropowder,and 4 mass% of cement.Based on replacing equiva-lent white corundum(≤0.045 mm)using 5 mass% of sintered spinel(≤0.048 mm),white corundum (≤0.045 mm,1%,3%,5%,7%,respectively,by mass)was replaced using equivalent sintered spinel(≤0.038 mm)to research the properties of the castables.The results show that adding sintered spinel fines can improve the hot modulus of rupture and thermal shock resistance.The specimen with 5 mass% of sin-tered spinel(≤0.038 mm)performs the highest hot modulus of rupture and the best thermal shock resist-ance.The solid-solution of corundum in sintered spinel fines has a great influence on the high temperature performance.
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