Fused-cast alumina-zirconia-silica refractory and glass melting furnace employing it

摘要

A fused-cast-alumina-zirconia-silica refractory consisting essentially of corundum crystals, baddeleyite crystals and a matrix glass phase and having a chemical composition comprising (a) from 30 to 70 wt% of Al₂O₃, (b) from 20 to 59 wt% of ZrO₂, (c) from 5 to 12 wt% of SiO₂, (d) from 0.15 to 0.60 wt% of Na₂O, (e) from 0 to 0.50 wt% of K₂O, (f) from 0 to 0.40 wt% of Li₂O, (g) from 0.05 to 0.80 wt% of B₂O₃, (h) from 0.05 to 0.80 wt% of P₂O₅, and (i) from 0.05 to 0.50 wt% in total of at least one member selected from the group consisting of SnO₂, ZnO, CuO and MnO₂.