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Low cement Al2O3-SiO2 castables was prepared using super grade bauxite(w(Al2O3)>85%) as aggregate,brown fused corundum,silicon carbide,Secar 71 CA cement,α-Al2O3 micropowder and microsilica as fine powders.The influence of SiC(0,5 wt%,10 wt%,and 15 wt%