Lamp seal glass

Electric lamp and discharge devices – With gas or vapor – Incandescent filament lamp

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Details

313623, 313636, 313315, H01J 1700

Patent

active

044410514

ABSTRACT:
A lamp seal glass is described suitable for direct hermetic sealing to molybdenum which consists essentially of oxides in approximate percent by weight 52-60 SiO.sub.2, 11-17 Al.sub.2 O.sub.3, 11-16 BaO, 8-12 CaO, and 3-7 B.sub.2 O.sub.3, along with minor amounts of incidental impurities, residual fluxes and refining agents, said glass having a liquidus temperature no greater than about 1170.degree. C., a softening point in the approximate range 900.degree.-930.degree. C., a strain point in the approximate range 650.degree.-680.degree. C., a working point in the approximate range 1180.degree.-1240.degree. C., and an average coefficient of linear thermal expansion in the 0.degree.-300.degree. C. temperature range between about 45-50.times.10.sup.-7 cm/cm/.degree.C. The glass composition enables improved manufacture of incandescent lamps operating in the moderately elevated temperature range 500.degree.-650.degree. C., especially regenerative cycle halogen lamps. In a preferred regenerative cycle halogen lamp, molybdenum inlead wires that are hermetically sealed to the glass envelope are further joined to larger diameter inlead wires exhibiting greater thermal expansion characteristics in the hermetic seal region.

REFERENCES:
patent: 3310413 (1967-03-01), Harrington
patent: 4060423 (1977-11-01), Thomas
patent: 4238705 (1980-12-01), Thomas
patent: 4302250 (1981-11-01), Danielson
patent: 4366409 (1982-12-01), Nieda et al.

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