TUNGSTEN CARBIDE POWDER, METHOD FOR PRODUCING TUNGSTEN CARBIDE POWDER, AND TUNGSTEN CARBIDE

PROBLEM TO BE SOLVED: To produce fine tungsten carbide powder simply and reproducibly, which has no heterogeneous phase and has a narrow particle size distribution.SOLUTION: In one embodiment of the present invention, the method for producing tungsten carbide powder comprises the steps of: (a) subje...

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Hauptverfasser: HONDA TOSHIHIKO, FUJI YUSUKE, OGISO TOMOKO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To produce fine tungsten carbide powder simply and reproducibly, which has no heterogeneous phase and has a narrow particle size distribution.SOLUTION: In one embodiment of the present invention, the method for producing tungsten carbide powder comprises the steps of: (a) subjecting a mixture to a hydrothermal treatment, the mixture being obtained by mixing a tungstate and an organic compound that becomes a carbon source so that, when a number of moles of the tungstate converted to W is denoted by Mw and a number of moles of the organic compound converted to C is denoted by Mc, Mc/Mw exceeds 3.78, and separating a solid generated to obtain a precursor; and (b) subjecting the precursor to a heat treatment under an inert gas atmosphere and an atmospheric pressure or more at 1050 to 1150°C to obtain fine tungsten carbide powder. For example, there can be used ammonium metatungstate as the tungstate and glucose as the organic compound.SELECTED DRAWING: None 【課題】異相がなく粒度分布の幅が狭い微粒の炭化タングステン粉末を簡便かつ再現性よく製造する。【解決手段】本発明の一実施形態の炭化タングステン粉末の製法は、(a)タングステン酸塩と炭素源となる有機化合物とを、前記タングステン酸塩をWに換算したときのモル数をMw、前記有機化合物をCに換算したときのモル数をMcとしたときにMc/Mwが3.78を超えるように混合した混合物を水熱処理し、生成した固形物を分離して前駆体を得る工程と、(b)前記前駆体を不活性ガス雰囲気下、大気圧以上で1050〜1150℃で熱処理して微粒の炭化タングステン粉末を得る工程と、を含む。例えば、タングステン酸塩としてメタタングステン酸アンモニウム、有機化合物としてグルコースを用いることができる。【選択図】なし