Lamp with low-toxicity, molybdenum-compatible sealing glass

Details Lamp with low-toxicity, molybdenum-compatible sealing glass Lamp with low-toxicity, molybdenum-compatible sealing glass

1987-04-27

1988-08-23

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313623, 313318, 313332, 501 15, 501 75, H01K 122, H01K 138, H01K 140

Patent

active

047663464

ABSTRACT:
To provide a melt glass (10) to seal capillary spaces (9) surrounding external current supply leads (8) of molybdenum passing to molybdenum foils (6) in a pinch or press seal (7) of a high temperature, for example incandescent halogen lamp, the melt glass (10) is made of 3-10% Bi.sub.2 O.sub.3, 25%-40% B.sub.2 O.sub.3, remainder PbO. The melt glass has low toxicity and is molybdenum-compatible. An additive of barium oxide, in up to 15% and preferably up to only about 10%, may be added to the PbO. All quantities in mol-percent.

REFERENCES:
patent: 2889952 (1959-06-01), Claypoole
patent: 3211826 (1965-10-01), Holcomb et al.
patent: 3259777 (1966-07-01), Fridrich
patent: 3588315 (1971-06-01), Levand, Jr. et al.
patent: 3645761 (1972-02-01), Kawamura et al.
patent: 4492814 (1985-01-01), Snell et al.
patent: 4493944 (1985-01-01), Snell et al.
patent: 4522925 (1985-06-01), Pirooz
Inorganic Glass-Forming Systems-U. of Sheffield, Glass Technology (Academic Press, London and New York, '67.
Material Information by Corning, Electrical Products Division, Electric Crucible Furnace Type, Simon Miller, publication "Crucible Furnaces", pp. 722-723.
Struktur und Kristallisation der Glaser" (Structure and Crystallization of Glasses", VEB Deutscher Verlag fuer Grundstoffidustrie, Leipzig (GRD, 1971), p. 93.

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