Effect of aggregate types on properties of Al2O3-SiC-C bricks for iron ladles
As an important part of refractory materials,aggregates determine the properties of materials.Al2O3-SiC-C bricks were prepared using bauxite,brown fused corundum or tabular corundum with particle sizes of 5-3,3-1 and ≤1 mm as aggregates,white fused corundum(≤0.045 mm),SiC(≤0.075 mm),active α-Al2O3 powder(≤0.045 mm)and flake graphite(≤0.15 mm)as matrix,and thermosetting phe-nolic resin as the binder.The effects of the three aggregates on the cold and hot mechanical properties as well as the slag resistance of Al2O3-SiC-C brick were studied.The results show that the Al2O3-SiC-C bricks has the best hot mechanical properties and slag resistance when using tabular corundum as aggre-gates due to its higher density and lower impurity phase contents;and when bauxite is used as aggre-gates,the hot mechanical properties and slag resistance of the brick are worst due to the high porosity and impurity contents of bauxite.
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