Method for producing ultrafine tungsten powder
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United States of America Patent
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Oct 17, 2017
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Nov 12, 2015
app pub date -
Sep 20, 2013
filing date -
Dec 17, 2012
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Abstract
A method for finely powdering tungsten powder, which includes: a process for classifying a material tungsten powder into a fine powder having a relatively small average particle diameter and a coarse powder having a relatively large average particle diameter; an oxidation process for forming an oxide film on the particle surface of the coarse powder; and an alkali treatment process for removing the oxide film formed in the oxidation process and a natural oxide film formed on the fine powder with an alkali aqueous solution. Also disclosed is a method for producing ultrafine tungsten powder, which includes obtaining tungsten powder having an average particle diameter of 0.04 to 0.4 μm and a BET specific surface area of 5 to 15 m2/g by the above method for finely powdering.
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