Title:
SPHERICAL TUNGSTEN DISULFIDE POWDER
Document Type and Number:
WIPO Patent Application WO2004055228
Kind Code:
A3
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.
Inventors:
GINGERICH RICHARD G W
Application Number:
PCT/US2003/025899
Publication Date:
January 06, 2005
Filing Date:
August 20, 2003
Export Citation:
Assignee:
OSRAM SYLVANIA INC (US)
International Classes:
C01G41/00; C10M103/06; C10M125/22; C10M171/06; C10M177/00; (IPC1-7): C10M125/22; C01G41/00
Foreign References:
| US5013466A | 1991-05-07 |
Other References:
See also references of EP 1543095A4
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