Lead-free, bismuth-containing silicate glass useful as funnel glass or weld glass in cathode ray tubes has a specified composition

摘要

Lead-free, bismuth-containing silicate glass contains specified amounts of silica, bismuth oxide, zirconia, alumina, magnesium oxide, calcium oxide, strontium oxide, barium oxide, alkaline earth metal oxides, zinc oxide, lithium oxide, sodium oxide, potassium oxide, cesium oxide, alkali metal oxides, cerium oxide, tungsten oxide, molybdenum oxide and antimony oxide. Lead-free, bismuth-containing silicate glass has the following composition (wt. % as oxide): silica (SiO2) 30 - 50; bismuth oxide (Bi2O3) 20 -40; zirconia (ZrO2) 0 -3; alumina (Al2O3) 0.5 - 5; magnesium oxide (MgO) 0 -4; calcium oxide (CaO) 0.5 - 4; strontium oxide (SrO) 1 -15; barium oxide (BaO) 0 -15; alkaline earth metal oxides 2 -20; zinc oxide (ZnO) 0 - 2; lithium oxide (Li2O) 0 -5; sodium oxide (Na2O) 1 - 12; potassium oxide (K2O) 2 - 15; cesium oxide (Cs2O) 0 - 3; alkali metal oxides 5 -20; cerium oxide (CeO2) 0 - 8; tungsten oxide (WO3) 0.5 - 5; molybdenum oxide (MoO3) 0 - 5; and antimony oxide (Sb2O3) 0 - 0.6.