摘要
采用特级高铝矾土熟料、红柱石、SiO2微粉及α-Al2O3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65:35,且固定粉料中SiO2微粉与α-Al2O3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-Al2O3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 aggregate to fines was 65：35 and the total addition of SiO2 micropowder and α-Al2O3 micropowder was fixed at 8% （in mass,the same hereinafter）,addition of α-Al2O3 micropowder was 8% ,6% ,4% ,2% and 0,respectively. 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 micropowder and α-Al2O3 micropowder are both 4% ,the specimen performs the best flowability;a lot of needle like mullite crystals form at high temperatures,crossing into the corundum skeleton,endowing the materials with the optimal cold modulus of rupture and thermal shock resistance.
出处
《耐火材料》
CAS
北大核心
2014年第3期208-210,共3页
Refractories
