High zirconia fused cast refractory
AssigneeAsahi Glass Company, Limited
InventorsNobuo TOMURA, Hironori Sato
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Abstract
To provide a high zirconia fused cast refractory which hardly has cracks, and has excellent durability and reusability, at the time of production of the refractory and during use for a glass melting furnace. A high zirconia fused cast refractory which has a chemical composition comprising from 85 to 95 mass % of ZrO2, at least 2.5 mass % of SiO2, at most 0.04 mass % of Na2O, at most 0.04 mass % of B2O3, and at most 0.04 mass % of P2O5, containing SrO as an essential component, and containing at least one of K2O and Cs2O, wherein contents of SrO, K2O and Cs2O satisfy the relations of the following formula (1) and (2) at the same time: 0.20≦[0.638×CK2O+0.213×CCs2O+0.580×CSrO]/CSiO2≦0.40 (1) 0.10≦0.580×CSrO/CSiO2 (2)
Claims9
A high zirconia fused cast refractory which has a chemical composition comprising from 85 to 95 mass % of ZrO2, at least 2.5 mass % of SiO2, at most 0.04 mass % of Na2O, at most 0.04 mass % of B2O3, and at most 0.04 mass % of P2O5, containing SrO as an essential component, and containing at least one of K2O and Cs2O, wherein contents of SrO, K2O and Cs2O satisfy the relations of the following formula (1) and (2) at the same time:
- 0.20≦[0.638×CK2O+0.213×CCs2O+0.580×CSrO]/CSiO2≦0.40 (1)
- 0.10≦0.580≦CSrO/CSiO2 (2)
- wherein CK2O is the content (mass %) of K2O in the fused cast refractory, CCs2O is the content (mass %) of Cs2O in the fused cast refractory, CSrO is the content (mass %) of SrO in the fused cast refractory, and CSiO2 is the content (mass) of SiO2 in the fused cast refractory.
Dependencies are inferred from the claim text.