Seal glass composition

Details Seal glass composition Seal glass composition

1986-11-17

1988-04-12

Blum, Theodore M.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313636, 501 67, H01K 150, H01J 1716, H01J 6135, C03C 3093

Patent

active

047376856

ABSTRACT:
An aluminosilicate glass composition is disclosed which is particularly useful for direct fusion sealing to both molybdenum and tungsten metals. The present glass composition provides an improved high temperature lamp envelope by reason of its reduced seed or bubble content. A minor amount up to approximately 3 weight percent ZrO.sub.2 is included in the glass as a refining agent to reduce the glass seed count and the glass further exhibits a higher strain point for less stress when the high temperature lamps are operated.

REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh, Jr.
patent: 4060423 (1977-11-01), Thomas
patent: 4192689 (1980-03-01), Rinehart
patent: 4238705 (1980-12-01), Thomas
patent: 4409516 (1983-10-01), Thomas

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