Glass envelopes for tungsten-halogen lamps

Details Glass envelopes for tungsten-halogen lamps Glass envelopes for tungsten-halogen lamps

1980-09-08

1981-11-24

Thomas, Earl C.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 304, C03C 310

Patent

active

043022502

ABSTRACT:
The instant invention is concerned with glass envelopes for tungsten-halogen lamps. The glasses exhibit a strain point higher than 750.degree. C., a coefficient of thermal expansion (0.degree.-300.degree. C.) between 42-44.times.10.sup.-7 /.degree.C., a liquidus temperature below 1300.degree. C., a viscosity at the liquidus of at least 40,000 poises, and consist essentially, in weight percent on the oxide basis, of 64-68% SiO.sub.2, 11-14% CaO, 16.5-18.5% Al.sub.2 O.sub.3, and 2-6.5% SrO+BaO consisting of 0-4% SrO and 0-5% BaO. The preferred glasses demonstrate a viscosity of less than 1000 poises at temperatures no higher than 1520.degree. C. and contain at least 3% total of SrO+BaO, those components being present in a molar ratio SrO:BaO ranging from 2:1-1:2.

REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh, Jr.
patent: 3942992 (1976-03-01), Flannery
patent: 3978362 (1976-08-01), Dumbaugh, Jr. et al.
patent: 4060423 (1977-11-01), Thomas
patent: 4180618 (1979-12-01), Alpha et al.

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