Niobium alumina sealing and product produced thereby

Details Niobium alumina sealing and product produced thereby Niobium alumina sealing and product produced thereby

1965-12-27

1977-01-18

Bashore, S. Leon

Electric lamp and discharge devices

With envelope

65 59R, 65155, 65374R, 228122, 220 21R, 220 23R, 313219, 313220, H01j 504

Patent

active

040041735

ABSTRACT:
A closure member of refractory metal comprising essentially niobium is sealed over an aperture in an envelope of high alumina content refractory oxide material by means of an interposed sealing layer composed of at least one of the metals titanium, zirconium, vanadium, hafnium, the assembly of closure member, sealing layer and envelope being pressed together and simultaneously heated so that the closure member is alloyed with the sealing layer and hermetically bonded to the envelope. The method is especially applicable to the manufacture of a sodium vapor electric discharge lamp having a tubular envelope of sintered polycrystalline alumina with niobium end caps.

REFERENCES:
patent: 2996401 (1961-08-01), Welch et al.
patent: 3324543 (1967-06-01), McVey et al.
patent: 3376121 (1968-04-01), Lawrence

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