| 摘要 |
To provide a highly zirconia-based refractory suitable for an electric melting furnace, which has a high electrical resistivity and does not exhibit a chipping off phenomenon such that the refractory surface partially chips off during temperature rise and which is scarcely susceptible to extraction of components even when in contact with molten low alkali glass and, hence, is less susceptible to cracking during operation. A highly zirconia-based refractory comprising, as chemical components by mass%, from 85 to 95% of ZrO 2 in terms of inner percentage, from 3.0 to 10% of SiO 2 in terms of inner percentage, from 0.85 to 3.0% of Al 2 O 3 in terms of inner percentage, substantially no Na 2 O, from 0.01 to 0.5% of K 2 O in terms of outer percentage, from 1.5 to 3.0% of SrO in terms of inner percentage, and from 0.1 to 2.0% of Nb 2 O 5 and/or Ta 2 O 5 as a value obtained by "(Nb 2 O 5 content)+(Ta 2 O 5 content/1.66)", in terms of inner percentage. |
