Method of producing nanophase W powder by low-pressure vapor...

Details Method of producing nanophase W powder by low-pressure vapor... Method of producing nanophase W powder by low-pressure vapor...

2007-04-24

2007-04-24

Wyszomierski, George P. (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

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

C075S367000

Reexamination Certificate

active

10747695

ABSTRACT:
W powder is produced by: preparing a precursor containing tungsten; producing gas by vaporizing or sublimating the precursor; separating the tungsten component by placing the gas in an inert atmosphere while maintaining pressure below atmospheric pressure; and condensing the tungsten component at pressure below atmospheric pressure.

REFERENCES:
patent: 5788738 (1998-08-01), Pirzada et al.
patent: 6846345 (2005-01-01), Keller et al.
patent: 2004/0219091 (2004-11-01), Kim et al.
patent: WO-93/05877 (1993-04-01), None

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