Method of manufacturing a non-sag tungsten wire for electric lam

Details Method of manufacturing a non-sag tungsten wire for electric lam Method of manufacturing a non-sag tungsten wire for electric lam

1996-02-28

1998-08-18

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75369, 75371, 419 4, B22F 924

Patent

active

057953660

ABSTRACT:
To essentially eliminate aluminum and silicon as contaminants in a doped tungsten wire, the tungsten wire is obtained by mechanical working of reduced tungsten blue oxide which contains as a primary or major constituent a special hexagonal ammonium tungsten bronze of the general formula (NH.sub.4).sub.X (NH.sub.3).sub.y WO.sub.3. A liquid doping step is carried out by adding a solution containing potassium nitrate, the special doped ammonium tungsten bronze forming preferably more than 70% by weight of the overall tungsten blue oxide. The special hexagonal ammonium tungsten bronze is made by decomposing ammonium paratungstate in an ammonium atmosphere, preferably at a temperature between about 400.degree. and 550.degree. C.

REFERENCES:
patent: 3927989 (1975-12-01), Koo
patent: 5072147 (1991-12-01), Pugh et al.
patent: 5087299 (1992-02-01), Fukuchi et al.
"The Metallurgy of Doped/Non-Sag Tungsten", edited by Erwin Pink and Laszlo artha, Elsevier Applied Science, London (1989), pp. 4-19, 30-35, 84-99.
"Bubbles --Chemische Untersuchungen zur Herstellung kaliumdotierter Wolframpulver fur die Gluhlampenproduktrion"(Bubbles -Chemical Investigations Relating to the Manufacture of Potassium Doped Tungsten Powder for the Production of Incandescent Lamps, Thesis by Alfred Gahn, Ludwig-Maximilians-University, Munich, 1986.

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