CAJ | 학술논문

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。
이전용종강옥（8～5、5～3、3～1 mm）화전용백강옥（≤1、≤0．045 mm）위주요원료，첨가α-Al2 O3미분화SiO2미분제비려산개수니결합강옥질요주료，연구료경110、800화1000℃열처리후함5％（w）SiO2미분화불함SiO2미분요주료기질중화학건변화여요주료강도적관계。채용XPS화FTIR연구SiO2미분여수니수화산물경110℃홍간화800℃열처리후적화학건변화。결과표명，경110화800℃열처리후，SiO2미분화수니수화물지간형성료Si—O—Al결합건。인차，재110～800℃，함SiO2미분적려산개수니결합요주료적강도교고적원인시SiO2미분여수니수화물지간형성료Si—O—Al화학건。
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 ℃.