Method for preparing ultrafine tungsten carbide powder
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United States of America Patent
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Mar 17, 2015
Grant Date -
Jan 3, 2013
app pub date -
Dec 30, 2009
filing date -
Nov 16, 2009
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Abstract
A method for preparing ultrafine powder of tungsten carbide using ultrafine tungsten powder and carbon black as raw materials is provided. The following steps are included: (1) passivation of the ultrafine tungsten powder: passivating the ultrafine tungsten powder under pure carbon dioxide; (2) carbon addition: mixing the ultrafine tungsten powder with carbon black powder after applying cooling water and inert gases; (3) carbonization: synthesizing the bulk tungsten carbide powder at high temperature in a carbonizing stove; (4) crushing and sieving: crushing the bulk tungsten carbide powder, cooling and sieving to obtain the ultrafine powder of tungsten carbide.
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