Application Of Aluminum Free Castable

Aluminum free castable takes super grade bauxite as aggregate and adds α- Al2O3 fine powder, brown corundum fine powder and admixture, the castable prepared with pure calcium aluminate cement as binder has the advantages of high strength and good penetration resistance of aluminum liquid. Because the material with high SiO2 content is easy to react with liquid aluminum and has poor permeability to liquid aluminum, the refractory material with high Al2O3 content and low SiO2 content is selected. The addition amount of calcium aluminate cement has an impact on the product strength. The experiment shows that the addition amount of calcium aluminate cement is 6%, the product strength is the largest, and the penetration resistance of aluminum liquid is the best. α- The addition of Al2O3 micro powder and brown corundum plays a good filling role and effectively improves the product strength. At the same time, α- The activity of Al2O3 powder reacts with SiO2 to form mullite, which also improves the high temperature strength of the product. After the admixture reacts with molten aluminum, a protective layer is formed on the surface of the product, which effectively improves the wettability of liquid aluminum.