采用特级高铝矾土熟料、红柱石、SiO2微粉及α-Al2 O3微粉为主要原料，以Secar71水泥为结合剂，固定骨料与细粉质量比为6535，且固定粉料中SiO2微粉与α-Al2 O3微粉的总加入量（w）为8％，研究了仅改变两种微粉的加入比例（α-Al2O3微粉的加入量（w）分别为8％、6％、4％、2％、0，SiO2微粉相应为0、2％、4％、6％、8％）对试样的流动性、高温强度、物相组成和显微结构的影响。结果表明：当α-Al2 O3微粉、SiO2微粉加入量（w）各为4％时，其流动性最佳，此时体系在高温下生成了大量的一次莫来石相，针状莫来石晶体穿插在刚玉骨架之间，使材料的常温抗折强度以及抗热震性最优。%The specimens were prepared using special grade bauxite clinker,andalusite,SiO2 micropowder and α-Al2O3 micropowder as main starting materials and Secar71 cement as binder.The mass ratio of ag-gregate to fines was 65 35 and the total addition of SiO2 micropowder and α-Al2 O3 micropowder was fixed at 8% (in mass,the same hereinafter),addition of α-Al2 O3 micropowder was 8%,6%,4%,2% and 0,re-spectively.Effects of adjusting additions of the two micropowders on the flowability,hot strength,phase composition and microstructure were researched.The results show that:when the additions of SiO2 mi-cropowder and α-Al2 O3 micropowder are both 4%,the specimen performs the best flowability;a lot of nee-dle like mullite crystals form at high temperatures,crossing into the corundum skeleton,endowing the mate-rials with the optimal cold modulus of rupture and thermal shock resistance.
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