Halogen incandescent lamp with intermetallique compound...

Details Halogen incandescent lamp with intermetallique compound... Halogen incandescent lamp with intermetallique compound...

H - Electricity

01

J

313/107

H01J 7/18 (2006.01) H01K 1/56 (2006.01)

Patent

CA 1138023

4.4.79 1 PHN.9301 ABSTRACT A halogen incandescent lamp having a light-pervious envelope containing a gas filling comprising a rare gas, hydrogen and bromine. The envelope also contains a tungsten filament and an oxygen getter. The oxygen getter consists of an intermetallic compound of at least one first metal from the group consisting of Ta, Ti, Zr, Hf and Nb and at least one second metal from the group consisting of Pd, Pt and Au, but which intermetallic compound is not a tanta- lum-gold or a niobium-gold compound. These intermetallic compounds are sufficiently stable that although they react with oxygen, they do not react with hydrogen bromide. Consequently the presence of such an intermetallic compound in such a halogen incandescent lamp does not interfere with the tungsten-bromine cycle, and thus the maximum quantity of the intermetallic compound which is present in such a lamp is not critical.

341808

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