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Abstract

A high zirconia electrically fused cast refractory of high electric resistance having long time durability, less suffering from cracking during production and upon temperature rising, excellent in productivity, less forming zircon crystals even upon heating the refractory in itself and when the refractory is in contact with molten glass, generating less cracks even when undergoing heat cycles during operation of a glass melting furnace is provided. A high zirconia electrically fused cast refractory has, as chemical components, 85 to 95% by weight of ZrO₂, 0.1 to less than 0.8% by weight of Al₂O₃, 3.5 to 10.0% by weight of SiO₂, less than 0.05% by weight of Na₂O and K₂O in total, 0.1 to 1.5% by weight of B₂O₃, 0.1% by weight or less of MgO, 0.01 to 0.2% by weight of CaO, in the case where any one of BaO and SrO is contained, from 0.05 to 3.0% by weight of BaO or 0.01 to 3.0% by weight of SrO, or in the case where both of them are contained, 0.01% by weight or more of SrO and from 0.01% to 3.0% by weight in total of SrO and BaO, 0.1 to 0.7% by weight of SnO₂, 0.3% by weight or less of Fe₂O₃ and TiO₂ in total, less than 0.01% by weight of P₂O₅, and less than 0.01% by weight of CuO.

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