Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making articles of indefinite length
Patent
1996-04-04
1998-04-21
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making articles of indefinite length
419 20, 419 28, 419 29, 419 30, 419 35, 419 45, 419 38, B22F 100, B22F 312, B22F 324, B22F 500
Patent
active
057428913
ABSTRACT:
A wire for fabrication of a vibration resistant filament for an incandescent lamp. The wire includes about 0.05-1.00 weight percent lanthanum oxide dispersed in a tungsten matrix and has a microstructure including stringers of fine particles of lanthanum oxide extending parallel to the wire axis. During primary recrystallization of a vibration resistant lamp filament from the filament wire, the stringers produce a microstructure in the filament exhibiting sufficient grain boundary segments extending generally axially along the length of the filament to render the filament resistant to vibration. A method for producing a vibration resistant filament for an incandescent lamp is also disclosed.
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Martin, III Harry D.
Patrician Thomas J.
Clark Robert F.
Jenkins Daniel J.
Osram Sylvania Inc.
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