Niobium-ceramic feedthrough assembly

Details Niobium-ceramic feedthrough assembly Niobium-ceramic feedthrough assembly

1990-11-30

1992-03-10

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313625, H01J 1716

Patent

active

050952463

ABSTRACT:
A process for sealing of niobium-ceramic through-wall assemblies for ceramic or metal vessels for high temperature and high pressure or vacuum applications, for example an electrical feedthrough and sealable fill opening in an alumina arc tube for a high intensity discharge (HID) lamp. The process produces a fritless hermetic seal while maintaining the ductility of the niobium components. The niobium-ceramic through-wall assembly includes an axially bored alumina or yttria sealing means having a ductile niobium throughpiece close fitted to and extending through the bore. The throughpiece is preferably essentially pure niobium, but may contain up to about 2% zirconium. The assembly is fired at about 1400.degree.-2000.degree. C. in a pure oxygen- and hydrogen-free (<5 ppm each) inert, preferably flowing, atmosphere or vacuum for a time sufficient to form a hermetic seal between the throughpiece and the sealing means. The fired assembly is then cooled to below 250.degree. C. while maintaining the pure inert atmosphere or vacuum. The end of the niobium throughpiece retains sufficient ductility after firing to permit pinching off of the end.

REFERENCES:
patent: 3363144 (1968-01-01), Johnson
patent: 4765820 (1988-08-01), Naganawa et al.
patent: 4827190 (1989-05-01), Wasui et al.

Affiliated with

Also associated with

Rating

Niobium-ceramic feedthrough assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Niobium-ceramic feedthrough assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Niobium-ceramic feedthrough assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2286908