Method of making nanocrystalline tungsten powder

Details Method of making nanocrystalline tungsten powder Method of making nanocrystalline tungsten powder

2011-08-02

2011-08-02

Wyszomierski, George (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

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

C075S623000

Reexamination Certificate

active

07988760

ABSTRACT:
There is described a method of making a nanocrystalline tungsten powder that comprises: (a) heating a tungsten-containing material in a reducing atmosphere at an intermediate temperature of from about 600° C. to about 700° C. for an intermediate time period; the tungsten-containing material being selected from ammonium paratungstate, ammonium metatungstate or a tungsten oxide; and (b) increasing the temperature to a final temperature of about 800° C. to about 1000° C. for a final time period.

REFERENCES:
patent: 5230729 (1993-07-01), McCandlish et al.
patent: 5352269 (1994-10-01), McCandlish et al.
patent: 6129890 (2000-10-01), Lunk et al.
patent: 7470309 (2008-12-01), Kim et al.

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