刚玉质浇注料的基本配比（w）为：6～3、3～1、≤1、≤0．045 mm的板状刚玉分别为20％、30％、20％、22％，活性Al2 O3微粉和水合氧化铝分别为3％和5％。以5％（w）SiO2微粉等量替代基本配比中≤0．045 mm的板状刚玉粉，研究了SiO2微粉对水合氧化铝结合刚玉质浇注料中温（600、800、1000℃）烧结的影响。此外，分别将水合氧化铝及质量比为11的SiO2微粉和水合氧化铝的混合物各加适量的水制备成浆体，用SEM对比观察110℃烘干和800℃处理后的显微结构变化。结果表明：1）在110℃烘干的情况下，SiO2微粉不仅填充了颗粒间隙，还同水合氧化铝的水化物形成交错互锁的网状结构，提高了含SiO2微粉浇注料的烘干强度；2）SiO2微粉在800℃能促进颗粒间的烧结，增强了颗粒间交错互锁的结合能力，使得含SiO2微粉的浇注料中温强度显著提高。
The basic formulation is tabular corundum (6 -3 mm 20 mass%,3 -1 mm 30 mass%,≤1 mm 20 mass% and ≤0.045 mm 22 mass%),active alumina 3 mass% and hydrated alumina 5 mass%, 5 mass% microsilica was used to replace the equal amount of tabular corundum (≤0.045 mm)to study the effect of microsilica on sintering property of hydrated alumina bonded corundum castables at intermedi-ate temperatures (600,800 and 1 000 ℃).Moreover,hydrated alumina and mixture of micro silica and hy-drated alumina with mass ratio of 1 1 were prepared into slurries by adding water,respectively.The micro-structures of the slurries after dried at 1 10 ℃or treated at 800 ℃were observed by SEM.The results show that:(1)after dried at 110 ℃,microsilica not only fills the voids among the particles,but also reacts with the hydrates of hydrated alumina forming a interlocking structure,enhancing the strength of the castable with microsilica after drying;(2)microsilica promotes the sintering among the particles,and reinforces the inter-locking structure of the castable after heated at 800 ℃,obviously improving the strength of the castables with microsilica after fired at intermediate temperatures.
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