Glass envelope for tungsten-bromine lamp

Details Glass envelope for tungsten-bromine lamp Glass envelope for tungsten-bromine lamp

H - Electricity

01

K

313/173, 261/20

H01K 1/28 (2006.01) C03C 3/04 (2006.01) C03C 3/087 (2006.01) H01K 1/50 (2006.01)

Patent

CA 1042927

GLASS ENVELOPE FOR TUNGSTEN-BROMIWE LAMP Abstract of the Disclosure The invention relates to glasses especially suitable for the envelope of a tungsten-bromine incandescent lamp and which can be sealed directly to molybdenum. Such glasses exhibit strain points in excess of 700°C., a viscosity at the liquidus of at least 100,000 poises, and a coefficient of thermal expansion (0°-300°C.) between about 48-55 x 10-7/°C. More particularly, such glasses consist essentially, by weight on the oxide basis, of about 58-63% SiO2, 13-16% Al2O3, 14-21% CaO, 0-5% MgO, and 0-7% BaO, the total CaO + MgO + BaO constituting at least about 19%.

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