HIGH-ZIRCONIA ELECTROCAST REFRACTORY AND METHOD FOR MANUFACTURING THE SAME

    公开(公告)号:EP3453689A1

    公开(公告)日:2019-03-13

    申请号:EP18192492.9

    申请日:2018-09-04

    摘要: To provide a high-zirconia electrocast refractory in which occurrence of cracks in manufacture and occurrence of cracks in use as a furnace material is further reduced while maintaining extremely high corrosion resistance to molten glass. The high-zirconia electrocast refractory contains 96.7 to 98.5 mass% of ZrO 2 , 0.8 to 2.7 mass% of SiO 2 , 0 to 0.2 mass% of Na 2 O, 0.21 to 1 mass% of K 2 O, 0.1 to 0.4 mass% of Al 2 O 3 , and does not substantially contain B 2 O 3 , in terms of oxide, as a chemical composition, wherein contents of the Na 2 O and the K 2 O satisfy a relation of following Formula (1) 0.15 mass % ≤ C K 2 O / 2 + C Na 2 O ≤ 0.6 mass % where C K2O is the content of K 2 O and C Na2O is the content of Na 2 O, and each of the contents is expressed by mass% in the refractory