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中文摘要：
在Al2O3-MgO质钢包浇注料基质内引入不同配比的镁砂细粉、SiO2微粉及预合成尖晶石细粉，固定MgO的总量约为5％（质量分数，下同），制成不同试样；研究各试样分别在400℃、800℃、1100℃、1400℃及1600℃处理3h后的物理性能以及随着温度升高而发生的物相变化。结果表明：加入预合成尖晶石细粉的试样由于没有太多的膨胀反应及液相，其显气孔率、线变化率及热态抗折强度等物理性能相对较好；基质中反应生成的尖晶石、CA6以及CA6晶粒的长大会对浇注料的显气孔率及线变化率起到不利影响：基质中加入0．5％SiO2微粉的试样，由于在高温下产生较多液相，使其在1400℃时的高温抗折强度发生明显下降，但对控制浇注料的高温膨胀还是有贡献的。
英文摘要：
Magnesia powder, microsilica and pre-synthesized spinel in different proportions were added into matrix of the alumina-magnesia castable,in which the MgO content remained invariable 5% （mass ratio）. Various specimens were composed and studies were focused on their physical properties and phase changes after heat treatment at 400 ℃,800 ℃, 1100 ℃, 1400 ℃ and 1600℃ for 3 h respectively. The results show that the castable with pre-synthesized spinel has low AP and PLC and high HMOR contributed by limited expansion and only a little liquid phase in the matix. The generation of spinel and CA6, and the growth of CA6 crystal will increase the AP and PLC, leading to a negative effect. The HMOR decreases dramatically with addition of 0.5% silica fume in the matrix due to forming of a large amount of liquid phase at high temperature,contributing to control of castable expansion at high temperature.
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