Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1995-07-26
1997-02-18
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75235, B22F 512, C22C 2704
Patent
active
056043210
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.
Mai Ngoclan
Osram Sylvania Inc.
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