Title:
微細タングステン粉末の製造方法
Document Type and Number:
Japanese Patent JP6811515
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a novel production method which uses, as the raw materials, e.g. ammonium paratungstate, which has been generally used conventionally, and prepares tungsten fine powder without a complicated process, e.g. tungsten powder of from the micron order to the nano level.SOLUTION: A method for producing tungsten fine powder includes the steps in which: as the raw materials used are ammonium metatungstate (AMT), ammonium paratungstate (APT), tungstic acid (HWO), or tungsten trioxide (WO) obtained by calcining them, and in an ammonia (NH) atmosphere they are reduced at 600-700°C, to obtain a reaction product containing tungsten oxynitride (W(ON)); and in which the reaction product containing tungsten oxynitride (W(ON)) is reduced with hydrogen in a hydrogen atmosphere at 700-850°C, to obtain tungsten fine powder.SELECTED DRAWING: None
Inventors:
Hideaki Shimizu
Toshihisa Idehara
Noboru Yasui
Toshihisa Idehara
Noboru Yasui
Application Number:
JP2017063588A
Publication Date:
January 13, 2021
Filing Date:
March 28, 2017
Export Citation:
Assignee:
Nippon Shinkin Co., Ltd.
International Classes:
B22F9/22; B22F1/00; C22C1/04
Domestic Patent References:
| JP2008045202A | ||||
| JP2009508001A | ||||
| JP2007200333A |
Foreign References:
| US20080223175 | ||||
| KR1020100077371A |
Attorney, Agent or Firm:
Kageyama Shuichi
Kurachi Yasuyuki
Yasushi Yamada
Kimura Koichi
Kurachi Yasuyuki
Yasushi Yamada
Kimura Koichi