The corrosion resistance of microsilica-containing Al₂O₃-MgO and Al₂O₃-spinel castables

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• 作者：E.Y. Sako ; ^{eric.ysako@gmail.com} ; M.A.L. Braulio ; V.C. Pandolfelli ^{vicpando@ufscar.br}
• 关键词：C. Corrosion resistance ; Microsilica ; Spinel castables
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4783-4789
• 文件大小：2344 K

摘要

Microsilica addition in Al₂O₃-MgO and Al₂O₃-spinel castables helps to improve their flowability and partially accommodate their residual expansion after firing. Nevertheless, there is a lack of conclusive statements in the literature regarding the effects of microsilica on one of the main requisites for steel ladle refractories: corrosion resistance. In the present work, the performance of alumina-magnesia and alumina-spinel with or without microsilica when in contact with a steel ladle slag was evaluated based on three aspects: the material's physical properties, its chemical composition and the microstructural features before the slag attack. According to the attained results, microsilica induced liquid formation and pore growth during sintering, favoring the physical slag infiltration. Moreover, due to this liquid, CA₆ was formed in the matrix, mainly for the Al₂O₃-spinel composition, which also favored the castable dissolution into the molten slag.