SiO2微粉对水泥结合刚玉质浇注料中低温化学键变化的影响  

Effect of microsilica on chemical bond of calcium aluminate cement bonded corundum castables at low and intermediate temperatures

作　　者：王青峰[1,2] 叶国田[1] 李坤鹏[1] 宋秀娟[1] 杨晓[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001 [2]洛阳理工学院材料科学与工程系,河南洛阳471023

出　　处：《耐火材料》2014年第6期409-413,共5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)

摘　　要：以电熔棕刚玉（8～5、5～3、3～1 mm）和电熔白刚玉（≤1、≤0．045 mm）为主要原料，添加α-Al2 O3微粉和SiO2微粉制备铝酸钙水泥结合刚玉质浇注料，研究了经110、800和1000℃热处理后含5％（w）SiO2微粉和不含SiO2微粉浇注料基质中化学键变化与浇注料强度的关系。采用XPS和FTIR研究SiO2微粉与水泥水化产物经110℃烘干和800℃热处理后的化学键变化。结果表明，经110和800℃热处理后，SiO2微粉和水泥水化物之间形成了Si—O—Al结合键。因此，在110～800℃，含SiO2微粉的铝酸钙水泥结合浇注料的强度较高的原因是SiO2微粉与水泥水化物之间形成了Si—O—Al化学键。Cal ci um al umi nate cement bonded corundum castabl e speci mens were prepared usi ng brown fused corundum （8-5,5 -3,3-1 mm）,white fused corundum （1 -0,≤0.045 mm）,micro-sized α-Al2O3 and microsilica as starting materials.This work was focused on investigating the relationship between the bond change in the castable matrix and the strength of the castable with 5 mass% microsilica or without microsilica after heat treatment at 110,800,and 1 000 ℃,respectively.Chemical bond changes between the microsilica and hydrates of calcium aluminate cement after drying at 110 ℃or firing at 800 ℃were investi-gated by XPS and FTI R.The results show that Si—O—Al bonds form between the microsilica and hydrates of calcium aluminate cement after drying at 110 ℃ or firing at 800 ℃.Therefore,the increased strength of castable specimens is attributed to the formation of Si—O—Al bonds from 110 ℃ to 800 ℃.

关 键 词：SIO2 微粉 铝酸钙水泥 刚玉质浇注料 化学键 

分 类 号：TQ175.73[化学工程—硅酸盐工业]