REFRACTORY PRODUCT HAVING A HIGH CONTENT OF ZIRCONIA

摘要

Fused cast refractory product comprising in percentages by weight on the basis of the oxides and for a total of 100%,—ZrO2; balance to hj 100%,—Hf2O: <5% SiO2: 2% to 10%;—Y2O3: 0.4% to 2.0%;—CaO: 4.0% to 8.0%;—B2O3+Na2O+K2O: 0.4% to 3.0%—Al2O3: 0.3% to 2.0%;—P2O5: <0.05%;—Fe2O3+TiO2: <0.55%;—other species: <1.5%. Application in glass melting furnaces.