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A series of corundum based castables with 0,2%,4%,6%,and 8% α-Al2O3 micropowders were prepared using tabular alumina aggregates (6-3,3-1 and ≤1 mm) and fines (≤0.088 and ≤0.045 mm),calcium aluminate cement,and α-Al2O3 micropowders (d50=1.754 μm) as starti