HIGH ZIRCONIA REFRACTORY MATERIAL

摘要

The invention relates to a molten cast refractory material comprising, in oxide wt % and totaling 100%: - ZrO2 + HfO2: the remainder of 100%; - SiO2: 3.5% to 6.0%; - Al2O3: 0.7% to 1.5%; - Na2O + K2O: 0.10 % to 0.43 %; - B2O3: 0.05% to 0.80%; - CaO + SrO + MgO + ZnO: 2O5:  2O3 + TiO2: 2O3/(Na2O + K2O) being greater than or equal to 3.5 and the wt % ratio for B2O3/(Na2O + K2O) being 0.3 to 2.5.