| abstract |
The present invention relates to a kind of fusion-cast refractory product, it comprises each oxide compound of following weight percent and these oxide compounds add up to 100%:ZrOn 2 + Hfn 2 o: supply remainder to 100%; SiOn 2 : 7.0% to 11.0%; Aln 2 on 3 : 0.2% to 0.7%; Nan 2 o+Kn 2 o:< 0.10%; Bn 2 on 3 : 0.3% to 1.5%; CaO+SrO+MgO+ZnO+BaO:< 0.4%; Pn 2 on 5 < 0.15%; Fen 2 on 3 + TiOn 2 : < 0.55%; Other oxide material: < 1.5%; This product have weight content be less than or equal to 1.0% be selected from Nbn 2 on 5 , Tan 2 on 5 and composition thereof doping agent, Aln 2 on 3 weight content/Bn 2 on 3 weight content, namely " A/B " is than being less than or equal to 2.0, does not comprise in 220 × 450 × 150mmn 3 block or diameter be 30mm and be highly the founding product of cylindrical bar shape of 30mm, this founding product has following chemical constitution with the mass percent of each oxide compound: form (I).The present invention can be used for glass melting furnace.n (I)。 |