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Abstract: Alkali resistant castable , which was configured by the waste porcelain
powder,Guangxi white mud,silicon carbide and silicon powder as main raw materials,calcium
aluminate cement as binder and appropriate amount of water.then by adjusting the amount of silicon carbide to study the impact of alkali resistant castable and the erosion mechanismon of alkali resistant castable by silicon carbide. The results showed that with the increasing of silicon carbide , volume of sample density increased first and then decreased, the compressive strength and bending strength were reduced in different degree, when sintering was completed,the  Strength showed an increasing trend. The silicon carbide form a layer of compact smooth film gradually in the heating process of oxidation , which prevented alkali vapor erosion. when the silicon carbide added 6 ¡«8%, samplelevel reached the level of alkali, alkaline erosion ability increased significantly.
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