Abstract Colloidal silica bonded bauxite-andalusite based castables were prepared using homogenized bauxite and andalusite as aggregates, andalusite fines, corundum fines, ultrafine Al 2 O 3 as matrixes and colloidal silica as binders. Effects of microsilica addition on the green strength, physical properties, hot strength and thermal shock resistance of castables were investigated. Moreover, phase composition and morphological evolution of specimens were characterized by XRD and SEM analysis. Green strength after demoulding, cold strength and hot strength as well as thermal shock resistance of the castables are enhanced with microsilica addition, which attribute to generating more chemical bond (–Si–O–Si–) after demoulding and heating at intermediate temperature (up to 1100 °C), and creating a stronger mullite bonding at higher temperature (1400 °C) compare to the specimens without microsilica.

中文翻译：

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添加微硅粉对胶体二氧化硅结合铝土-红柱石基浇注料性能的影响

摘要 以均质化的铝土矿和红柱石为骨料，以红柱石粉、刚玉粉、超细Al 2 O 3 为基体，胶体二氧化硅为结合剂，制备了胶体二氧化硅粘结铝土-红柱石基浇注料。研究了微硅粉添加对浇注料生坯强度、物理性能、热强度和抗热震性的影响。此外，通过XRD和SEM分析表征了样品的相组成和形态演变。添加微硅粉可提高浇注料脱模后的生坯强度、冷热强度以及抗热震性，这归因于脱模和中温加热后产生更多的化学键（-Si-O-Si-）。到 1100 °C),