Method of making nanocrystalline tungsten powder
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United States of America Patent
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Aug 2, 2011
Grant Date -
Sep 18, 2008
app pub date -
Feb 25, 2008
filing date -
Mar 13, 2007
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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.
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