| 摘要 |
To provide a high zirconia fused cast refractory having high durability, which hardly has cracks during the heating, by temperature changes during use and during the cooling at the time of suspension of operation. A high zirconia fused cast refractory which has a chemical composition comprising from 86 to 96 mass% of ZrO 2 , from 2.5 to 8.5 mass% of SiO 2 , from 0.4 to 3 mass% of Al 2 O 3 , from 0.4 to 1.8 mass% of K 2 O, at most 0.04 mass% of B 2 O 3 , at most 0.04 mass% of P 2 O 5 and at most 3.8 mass% of Cs 2 O and containing substantially no Na 2 O. |
