关键词: Al2O3-MgO-CaO体系;二氧化硅;熔融石英粉;物理性能

Abstract: In this experiment, high purity Al2 O3-MgO-CaO castables were prepared using tabular corundum, sintered spinel and the activity α-Al2 O3 as the main raw material, calcium aluminate cement as binder, addition with the fused silica powder (w(SiO2 ) =99.64％) with 0wt％, 0.25wt％ and 0. 5wt％.By changing the amount of fused silica powder to change the amount of SiO 2 introduced, the relative properties of the sample were tested.In order to study the effect of SiO 2 introduction on the properties of castables, the feasibility of improving the thermal shock stability of molten glass by introducing trace SiO 2 in high temperature sintering is also investigated .The results showed that the addition of trace SiO2 on the properties of samples was especially high temperature properties are still significant, introducing the amount of SiO 2 in the 0wt％-0.25wt％, the performance of the samples is excellent; By introducing the glass phase produced by high temperature sintering of trace SiO 2 , the thermal shock resistance of the material can be improved by promoting the growth of CA 6 and adjusting its insert structure while buffering the thermal stress .

Key words: Al2 O3-MgO-CaO system;silicon dioxide;fused silica powder;physical property