Patent ID: 6077801
Filing Date: 2000-06-20
Classification: C03B,C04B,Y02P

Abstract:
A fused cast refractory material having the following chemical analysis expressed as molar percentages:11.25% to 15.45% of at least one alkali metal oxide selected from the group consisting of Na.sub.2 O, Li.sub.2 O and K.sub.2 O provided that Na.sub.2 O represents at least 9.3%,0.64 to 2.97% SiO.sub.2,81. 38% to 88.75% Al.sub.2 O.sub.3, andat most 0.2% impurities,said material consisting essentially of grains and of an interstitial Na.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 phase binding said grains, at least 98% of said grains being .beta.-alumina grains.