Patent ID: 6812177
Filing Date: 2004-11-02
Classification: C03B,C04B

Abstract:
A porous high-alumina fused cast refractory, comprising:from 94 to 98 weight % of Al2O3, from 1 to 6 weight %, in total, of Na2O or K2O or both as chemical components, which cast refractory mainly comprises &agr;-Al2O3 crystals and &bgr;-Al2O3 crystals in a ratio of &agr;-Al2O3 crystals to the sum of &agr;-Al2O3 crystals and &bgr;-Al2O3 crystals ranging from 30 to 70 weight %, and which has pores dispersed therein said cast refractory having a porosity ranging from 5 to 30%.