Ceramic lamp having tubular inlead containing yttrium-zirconium

Details Ceramic lamp having tubular inlead containing yttrium-zirconium Ceramic lamp having tubular inlead containing yttrium-zirconium

1976-07-01

1977-11-01

Rolinec, Rudolph V.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313220, 313331, H01J 6106, H01J 6136

Patent

active

040567524

ABSTRACT:
A high pressure sodium vapor lamp arc tube of alumina ceramic has end closures one of which includes an externally projecting tube of niobium or tantalum serving as inlead and having a portion extending into the inside of the arc tube. A tungsten electrode shank is welded into the end of the niobium tube but the seal at the weld may not be fully hermetic. To assure a fully hermetic seal, a mixture of yttrium and zirconium which has a lower melting point than pure yttrium is included in the niobium tube.

REFERENCES:
patent: 3485343 (1969-12-01), Jorgensen
patent: 3558963 (1971-01-01), Hanneman et al.

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