Method of making non-sag tungsten wire for electric lamps

Details Method of making non-sag tungsten wire for electric lamps Method of making non-sag tungsten wire for electric lamps

1999-09-07

2000-12-26

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making articles of indefinite length

419 28, 419 34, 419 35, 419 38, B22F 102

Patent

active

061654124

ABSTRACT:
A method of making a potassium-doped tungsten powder is described comprising forming a mixture of ammonium paratungstate or ammonium metatungstate and a potassium-containing compound selected from a thermally unstable potassium-containing salt or a potassium tungstate, and reducing the mixture in a single step without adding additional dopants to form a potassium-doped tungsten powder. The potassium-doped tungsten powder produced by the method of this invention can be pressed, sintered and drawn to produce a non-sag tungsten wire.

REFERENCES:
patent: 1082933 (1913-12-01), Coolidge
patent: 1226470 (1917-05-01), Coolidge
patent: 1410499 (1922-03-01), Pacz
patent: 3853492 (1974-12-01), Millner et al.
patent: 3927989 (1975-12-01), Koo
patent: 4971757 (1990-11-01), Day et al.
patent: 5019330 (1991-05-01), Bewlay et al.
patent: 5072147 (1991-12-01), Pugh et al.
patent: 5087299 (1992-02-01), Fukuchi et al.
patent: 5284614 (1994-02-01), Chen et al.
patent: 5785731 (1998-07-01), Fait et al.
patent: 5795366 (1998-08-01), Salmen et al.
1 K. Hara et al., The Development of High Quality Tungsten Wire for High Stress Halogen Lamp, Nippon Tungsten Review 29 (1997) pp. 20-29.
2 H.-J. Lunk et al., What is Behind "Tungsten Blue Oxides"?, Refractory Metals & Hard Materials 12 (1993-1994) pp. 17-26.
3 H.-J. Lunk et al., Solid State 1H NMR Studies of Different Tungsten Blue Oxides and Related Substances, Refractory Metals, & Hard Materials 16 (1198) pp. 3-30.

Affiliated with

Also associated with

Rating

Method of making non-sag tungsten wire for electric lamps does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making non-sag tungsten wire for electric lamps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making non-sag tungsten wire for electric lamps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-991375