| 摘要 |
To provide a high zirconia fused cast refractory that suffers less cracks in production and on heating, has excellent productivity, is hard to form zircon crystals with the refractory solely and under conditions where the refractory is in contact with molten glass, is hard to suffer cracks on receiving heat cycles in operation of a glass melting furnace, and has durability for a prolonged period of time. [Solution to Problems] A high zirconia fused cast refractory containing, as chemical components, from 85 to 95% by weight of Zr02, from 0.4 to 2.5% by weight of A1203, from 3.5 to 10% by weight of Si02, from 0.05 to 1% by weight in total of Na20 and K20, more than 0.04% by weight and 1% by weight or less of &Bgr;203, 0.02% by weight or less of P205, 0.05% by weight or less of MgO, from 0.01 to 0.2% by weight of CaO, in the case where any one of SrO and BaO is contained, from 0.3 to 3% by weight of SrO or more than 0.5% by weight and 3% by weight or less of BaO, and in the case where both of them are contained, 0.3% by weight or more of SrO and from 0.3 to 3% by weight in total of SrO and BaO, from 0.01 to 0.7% by weight of Sn02, and 0.3% by weight or less in total of Fe203 and Ti02. |
