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 ℃.
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