Glass and use of a glass for glass-metal compounds

摘要

The glass comprises silica (75-80 wt.%), boron trioxide (4.5-6 wt.%), alumina (2-4.5 wt.%), sodium oxide (5.5-7 wt.%), potassium oxide (0-2 wt.%), calcium oxide (2.5-8 wt.%), magnesium oxide (0-2 wt.%), barium oxide (0-4 wt.%), titanium oxide (0-5 wt.%), cesium oxide (0-2 wt.%), ferric oxide (0-0.1 wt.%), fluorine (0-2 wt.%). The ratio of aluminum oxide and boron trioxide is less than 5 mol% to the amount of magnesium oxide, calcium oxide and barium oxide, for a glass tube in a tube collector with a glass-metal-compound. The glass comprises silica (75-80 wt.%), boron trioxide (4.5-6 wt.%), alumina (2-4.5 wt.%), sodium oxide (5.5-7 wt.%), potassium oxide (0-2 wt.%), calcium oxide (2.5-8 wt.%), magnesium oxide (0-2 wt.%), barium oxide (0-4 wt.%), titanium oxide (0-5 wt.%), cesium oxide (0-2 wt.%), ferric oxide (0-0.1 wt.%), fluorine (0-2 wt.%). The ratio of aluminum oxide and boron trioxide is less than 5 mol% to the amount of magnesium oxide, calcium oxide and barium oxide, for a glass tube in a tube collector with a glass-metal-compound. The amount of calcium oxide, magnesium oxide, barium oxide, strontium oxide and zinc oxide is greater than 3 wt.%. The glass consists of 100-150 ppm of ferric oxide. The glass consists of named components up to pollution. The metal/metal alloy of the glass-metal compound is a covar alloy.