关键词: Al2O3-MgO-CaO体系;氧化钙;纯铝酸钙水泥;物理性能

Abstract: High purity Al2O3-MgO-CaO castables are widely used in purging plug, lining and wall repairing material of the refining ladle.Pure calcium aluminate cement is the binder of castable for Al2O3-MgO-CaO system,also is the main source of CaO castable.In this experiment,the content of CaO was changed by changing the amount of pure calcium aluminate cement,and the influence of CA 6on the relative properties of the system formed at high temperature was investigated.The results show that the physical properties of the material treated with 110 ℃ showed the trend of optimization with the introduction of the calcium oxide content.The volume expansion of CA 6formed in promoting the densification of the structure, when up to a certain extent, also will lead to deterioration of material structure,so the material is 1550℃and 5 thermal cycles,the physical performance increases at first and then decreases.In summary,the addition of pure calcium aluminate cement at 5wt%-8wt%is superior to its high temperature strength and spalling resistance.

Key words: Al2O3-MgO-CaO system;calcium oxide;pure calcium aluminate cement;physical property