摘要
刚玉质浇注料的基本配比（w）为：6-3、3-1、≤1、≤0．045mm的板状刚玉分别为20％、30％、20％、22％，活性Al2O3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≤0．045mm的板状刚玉粉，研究了Si02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1：1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 microsiiica on sintering property of hydrated alumina bonded corundum castables at intermedi- ate temperatures （600,800 and 1000 ℃）. 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 110 ℃ 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.
出处
《耐火材料》
CAS
北大核心
2014年第2期103-105,110,共4页
Refractories
基金
国家自然科学基金项目(51372230)
“十二·五”科技支撑计划项目(2013BAE03B01)
关键词
水合氧化铝
SIO2微粉
浇注料
烧结
中温强度
hydrated alumina
microsilica
castable
sintering
intermediate temperatures
