There have been reports that strength of hydratable alumina (HA)‐bonded castables without silica fume drops significantly at 600°C and decreases substantially again at 1000°C. But the strength variation of the HA‐bonded castables during the intermediate temperature range has not been investigated and elaborated from the perspective of phase evolution and microstructural change in the castables. In this work, the relationship between the change in the strength of castables and the microstructural characteristics of the HA‐bonded castables was investigated. The phase and microstructure evolution of HA‐bonded castables between 110°C and 1250°C were investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TG). It has been found that strength drops of the HA‐bonded castables during heating process do not mainly happen at the temperature at which HA hydrates decompose, but at the temperature at which the structure of dehydrated HA hydrates disintegrates.

中文翻译：

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1250°C以下水合产物的微观结构演变和水合氧化铝粘结浇铸料的强度变化

有报道说，没有硅粉的可水合氧化铝（HA）粘结浇注料的强度在600°C时明显下降，而在1000°C时又大幅下降。但是，尚未从相变和微观结构变化的角度研究和研究HA键合浇铸材料在中等温度范围内的强度变化。在这项工作中，研究了浇注料强度变化与HA粘结浇注料的微观结构特征之间的关系。通过X射线衍射（XRD），扫描电子显微镜（SEM）和热重分析（TG）研究了在110°C和1250°C之间HA粘结的可浇铸物的相和微观结构演变。