ALUMINA-ZIRCONIA-SILICA FUSED-CAST REFRACTORY MATERIAL, GLASS FURNACE, AND METHOD FOR PRODUCING SHEET GLASS

摘要

Provided are: an alumina-zirconia-silica fused-cast refractory material suitable as a refractory material for glass production apparatuses, and which suppresses the exudation of glass components from the refractory material; and a glass furnace using same. An alumina-zirconia-silica fused-cast refractory material containing, as essential components, Al₂O₃, ZrO₂, SiO₂ and Na₂O, in mass percentage in oxide equivalent, 20.0% ≤ Al₂O₃ ≤ 70.0%, 10.0% ≤ ZrO₂ 41.5%, 3.8% ≤ SiO₂ ≤ 18.0%, 1.3% ≤ Na₂O ≤ 15.0%, where Al₂O₃/SiO₂ 6.5, 0.20 ≤ Na₂O/SiO₂, and the total amount of the abovementioned essential components is at least 85%.