Spherical tungsten disulfide powder

Details Spherical tungsten disulfide powder Spherical tungsten disulfide powder

2005-11-01

2005-11-01

Johnson, Jerry D. (Department: 1764)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Inorganic compound

C423S561100

Reexamination Certificate

active

06960556

ABSTRACT:
A tungsten disulfide powder comprised of macro-spherical particles of tungsten disulfide having an average particle diameter of from about 5 to about 50 micrometers is prepared by successively treating spray-dried powders of ammonium metatungstate with heat in air and sulfidizing the resultant tungsten trioxide in a carbon disulfide-containing atmosphere at about 750° C. The tungsten disulfide powder may also be formed to have a bimodal particle size distribution of the macro-spherical particles and smaller, dispersed micro- to submicron-sized fine particles.

REFERENCES:
patent: 4075111 (1978-02-01), Bilow et al.
patent: 4715972 (1987-12-01), Pacholke
patent: 5013466 (1991-05-01), Obara et al.
patent: 6217843 (2001-04-01), Homyonfer et al.
patent: 2004/0067385 (2004-04-01), LeClaire
patent: WO 01/66462 (2001-09-01), None

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