| abstract |
A high zirconia refractory product characterized by having a chemical composition which contains 85 to 95 mass % of ZrO2, 2.5 mass % or more of SiO2, 0.04 mass % or less of Na2O, 0.04 mass % or less of B2O3, 0.04 mass % or less of P2O5, SrO as the essential component, and K2O and/or Cs2O, wherein SrO, K2O and Cs2O are included in a manner such that the relationships represented by equation (1) and equation (2) are satisfied at the same time: equation (1) being 0.20={0.638CK2O+0.213CCs2O+0.580CSrO}/CSiO2=0.40, and equation (2) being 0.10=0.580CSrO/CSiO2. (In the equations, CK2O represents the content (mass %) of K2O in the refractory product, CCs2O represents the content (mass %) of Cs2O in the refractory product, CSrO represents the content (mass %) of SrO in the refractory product, and CSiO2 represents the content (mass %) of SiO2 in the refractory product.) |