Electric lamp

Details Electric lamp Electric lamp

1979-11-01

1981-03-03

Reynolds, B. A.

Electricity: conductors and insulators

Boxes and housings

Hermetic sealed envelope type

65 59R, 313331, H01K 138

Patent

active

042543002

ABSTRACT:
In electric lamps having a lamp envelope (20) of a type of glass containing at least 95% by weight of SiO.sub.2, the current leadthrough conductors (22, 23) usually consist of molybdenum foils to which internal (26, 27) and external (24, 25) current conductors are welded.
After welding and upon making the pinch seal (21) of the lamp vessel (20), fracture frequently occurs in the molybdenum foils (22, 23).
Molybdenum foils (22, 23) in which yttrium oxide particles are dispersed in a quantity of 1/4-1% of the molybdenum weight, have proved to be considerably stronger than similar thickness molybdenum foils containing no yttrium oxide.

REFERENCES:
patent: 3211826 (1956-10-01), Holcomb et al.
patent: 4110657 (1978-08-01), Sobieski

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