WO2010024474A1 - PROCÉDÉ DE PRODUCTION DE POUDRE COMPOSITE DE WC-Co - Google Patents

PROCÉDÉ DE PRODUCTION DE POUDRE COMPOSITE DE WC-Co Download PDF

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Publication number
WO2010024474A1
WO2010024474A1 PCT/KR2008/004944 KR2008004944W WO2010024474A1 WO 2010024474 A1 WO2010024474 A1 WO 2010024474A1 KR 2008004944 W KR2008004944 W KR 2008004944W WO 2010024474 A1 WO2010024474 A1 WO 2010024474A1
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WO
WIPO (PCT)
Prior art keywords
powder
slurry
fluid
producing
composite powder
Prior art date
Application number
PCT/KR2008/004944
Other languages
English (en)
Inventor
Jin-Chun Kim
Ji-Soon Kim
Young-Soon Kwon
Original Assignee
University Of Ulsan Foundation For Industry Cooperation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University Of Ulsan Foundation For Industry Cooperation filed Critical University Of Ulsan Foundation For Industry Cooperation
Priority to PCT/KR2008/004944 priority Critical patent/WO2010024474A1/fr
Publication of WO2010024474A1 publication Critical patent/WO2010024474A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the present invention relates to a method for producing WC-Co composite powder, and more particularly, to a method for producing WC-Co composite powder in form of a homogeneously blended composite, which contributes to high strength of cemented carbide, and thus is advantageous as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products.
  • a technique typically used now for producing WC-Co composite powder involves the synthesis of tungsten carbide (WC) by solid state reaction, i.e., mixing tungsten (W) powder with solid state carbon (C) powder and carburizing at high temperature, followed by the addition of cobalt (Co) powder to the mixture.
  • WC tungsten carbide
  • C solid state carbon
  • the synthesis method by solid state reaction has some limitation; for example, it is hard to obtain WC powder having a particle size of 0.5 ⁇ m or less through the mechanical pulverization.
  • the synthesis method using liquid state turned out to be not suitable for the preparation of ultrafine powder having a particle size of 0.1 ⁇ m or less simply by drying the aqueous solution and growing WC powder under deoxidation/carburization/heat treatment conditions.
  • coagulative properties of ultrafine powder make it more difficult to produce WC-Co composite powder out of WC powder and Co powder, and the ultrafine Co powder often undergoes rapid oxidation.
  • an object of the present invention to provide a method for producing WC-Co composite powder in form of a homogeneously blended composite, which contributes to high strength of cemented carbide, and thus is advantageous as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products.
  • a method for producing WC-Co composite powder which comprises the steps of mixing WC powder and a fluid to prepare a slurry, electrically exploding a cobalt metal wire in the slurry, and drying the fluid contained in the slurry.
  • the WC powder is mixed in a fluid that is selected from the group consisting of water, hydrogen peroxide, ethanol, ethanol glycol, glycerin, gelatin, engine oil, distilled water, benzene, toluene, saline solution, edible oil, petroleum, and gasoline.
  • At least one polymer dispersant selected from the group consisting of commercially available polymers including, but not limited to, PVP (polyvinylpyrrolidone), PEI (polyethylenimine), PDADMAC (polydiallydimethylammonium chloride), TWIN 80, polyethylene glycol- condensed, glycerin esters of fatty acids, alkanol amides of fatty acids, and so on; or at least one binder selected from the group consisting of low-melting point organic compounds including, but not limited to, acryl, stearic acid, wax, and so on.
  • PVP polyvinylpyrrolidone
  • PEI polyethylenimine
  • PDADMAC polydiallydimethylammonium chloride
  • TWIN 80 polyethylene glycol- condensed, glycerin esters of fatty acids, alkanol amides of fatty acids, and so on
  • TWIN 80 polyethylene glycol- condensed, glycerin est
  • the method for producing WC-Co composite powder according to the present invention has the following advantages.
  • cobalt powder behaving as a matrix phase can essentially be protected from oxidation, and the WC powder together with the cobalt metal powder form a homogeneously blended composite.
  • the WC powder together with the cobalt metal powder form a homogeneously blended composite at a higher efficiency.
  • the resulting WC-Co composite powder contributes to high strength of cemented carbide, and thus is advantageous as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products.
  • Fig. 1 is a flow chart describing a method for producing WC-Co composite powder in accordance with one embodiment of the present invention.
  • Fig. 2 shows a picture of a device used for the method for producing WC- Co composite powder in accordance with one embodiment of the present invention.
  • Fig. 3 shows the state of a slurry in an electric explosion step out of the method for producing WC-Co composite powder in accordance with one embodiment of the present invention.
  • Fig. 4 is a conceptual view of the WC-Co composite powder produced based on the method for producing WC-Co composite powder in accordance with one embodiment of the present invention.
  • Fig. 1 is a flow chart describing a method for producing WC-Co composite powder in accordance with one embodiment of the present invention
  • Fig. 2 shows a picture of a device used for the method for producing WC-Co composite powder in accordance with one embodiment of the present invention
  • Fig. 3 shows the state of a slurry in an electric explosion step out of the method for producing WC-Co composite powder in accordance with one embodiment of the present invention
  • Fig. 4 is a conceptual view of the WC-Co composite powder produced based on the method for producing WC-Co composite powder in accordance with one embodiment of the present invention.
  • the method for producing WC-Co composite powder comprises a slurry preparation step (S110), an electric explosion step (S120), a drying step (S130), and a collection step (S140).
  • the slurry preparation (S110) is a process where WC powder is mixed with a fluid to produce a slurry. To this end, WC powder having a particle size from nanometer to micrometer scale can be used.
  • Examples of the fluid may include, but are not limited to, water, hydrogen peroxide, ethanol, ethanol glycol, glycerin, gelatin, engine oil, distilled water, benzene, toluene, saline solution, edible oil, petroleum, and gasoline, which are used singly or in combination of two or more.
  • a dispersant may be added for a fine and homogeneous dispersion of the WC powder in the fluid.
  • Examples of such a dispersant may include, but are not limited to commercially available polymers including, but not limited to, PVP (polyvinylpyrrolidone), PEI (polyethylenimine), PDADMAC (polydiallydimethylammonium chloride), TWIN 80, polyethylene glycol- condensed, glycerin esters of fatty acids, and alkanol amides of fatty acids, which are used singly or in combination of two or more.
  • PVP polyvinylpyrrolidone
  • PEI polyethylenimine
  • PDADMAC polydiallydimethylammonium chloride
  • TWIN 80 polyethylene glycol- condensed, glycerin esters of fatty acids, and alkanol amides of fatty acids, which are used singly or in combination of two or more.
  • a binder may be added to increase bond strength between cobalt metal powder discharged from the electric explosion step (S120, to be described) and the WC powder.
  • a binder may include, but are not limited to, low-melting point organic compounds including, but not limited to, acryl, stearic acid, and wax, which are used singly or in combination of two or more.
  • the electric explosion (S 120) is a process where electric power is supplied to a cobalt metal wire in the slurry to cause electric explosion.
  • electric power is supplied to a metal wire
  • the metal wire is exploded through melting, discharge, and vaporization of metal due to the generated heat, and the metal pulverization proceeds.
  • the electric explosion step (S120) is carried out by supplying 0.5-2OkV electric power to the metal wire for a period of time from several micro seconds to several tens of minutes.
  • the electric explosion step (S 120) is carried out using a device shown in Fig. 2.
  • cobalt powder behaving as a matrix phase can essentially be protected from oxidation, and coagulation does not occur among the cobalt metal powder particles, thereby producing the cobalt metal powder in nanometer scale.
  • WC powder 110 and a fluid 130 are mixed together to prepare a slurry, and a cobalt metal line 120 is placed in the slurry.
  • cobalt metal line 120 When electric power is applied to the cobalt metal line 120, cobalt metal powder 121 is discharged from the cobalt metal wire 120 into the fluid 130. The discharged cobalt metal powder 121 binds with the WC powder 110.
  • Fig. 4 depicts the configuration of WC-Co composite powder formed from the electric explosion (S120). As can be seen in Fig. 4, the WC powder and the cobalt metal powder are blended homogeneously in the WC-Co composite powder.
  • the electric explosion within the fluid serves to prevent the growth of the cobalt metal powder or the oxidation thereof, such that the nanometer-scale cobalt metal powder may be discharged from the cobalt metal wire.
  • the drying process (S130) is for drying the fluid used for the slurry preparation (S130). In accordance with one embodiment of the present invention, the fluid is heated at a temperature higher than the evaporation point of the fluid to vaporize the fluid. However, the present invention is not limited thereto, but any other method for drying the used fluid can also be utilized.
  • the collection process (S140) is for collecting the remaining WC-
  • the collected WC-Co composite powder may be advantageously used as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé pour la production d'une poudre composite de WC-Co, consistant à mélanger une poudre de WC et un fluide de manière à préparer une pâte, à provoquer l'explosion électrique d'un fil métallique de cobalt dans la pâte, puis à sécher le fluide contenu dans ladite pâte. Selon ledit procédé de production d'une poudre composite de WC-Co, du fait de l'explosion du fil métallique de cobalt dans la pâte préparée par mélange d'une poudre de WC et d'un fluide, une poudre de cobalt agissant comme une phase matricielle peut être essentiellement protégée contre l'oxydation, la poudre de WC peut former un composite mélangé de façon homogène conjointement avec la poudre métallique de cobalt, et la poudre composite de WC-Co contribue à la haute résistance d'un carbure cémenté de métal dur, lequel est utilisé avantageusement comme matériau brut pour la fabrication d'outils, de pièces résistantes à l'abrasion et de produits de filière en carbure.
PCT/KR2008/004944 2008-08-25 2008-08-25 PROCÉDÉ DE PRODUCTION DE POUDRE COMPOSITE DE WC-Co WO2010024474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/004944 WO2010024474A1 (fr) 2008-08-25 2008-08-25 PROCÉDÉ DE PRODUCTION DE POUDRE COMPOSITE DE WC-Co

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/004944 WO2010024474A1 (fr) 2008-08-25 2008-08-25 PROCÉDÉ DE PRODUCTION DE POUDRE COMPOSITE DE WC-Co

Publications (1)

Publication Number Publication Date
WO2010024474A1 true WO2010024474A1 (fr) 2010-03-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105499557A (zh) * 2016-01-28 2016-04-20 河南中硬合金有限公司 一种硬质合金大制品顶锤多元组分成型剂及制备方法
US10538829B2 (en) 2013-10-04 2020-01-21 Kennametal India Limited Hard material and method of making the same from an aqueous hard material milling slurry

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004112997A1 (fr) * 2003-06-25 2004-12-29 Jawahar Lal Nehru University Procede et appareil permettant de produire des nanoparticules metalliques
US6878182B2 (en) * 2001-12-19 2005-04-12 Seco Tools Ab Method of making tungsten carbide based hard metals
KR20060041394A (ko) * 2004-11-08 2006-05-12 재단법인 포항산업과학연구원 용사코팅용 나노구조 텅스텐 카바이드-코발트계 분말의 제조 방법
US7094821B2 (en) * 2002-12-02 2006-08-22 Seco Tools Ab Method of making tungsten carbide based hard metal tools or components
KR20070024041A (ko) * 2005-08-26 2007-03-02 한국전기연구원 액중 전기폭발에 의한 나노분말 제조 방법 및 장치
KR20090017021A (ko) * 2007-08-13 2009-02-18 울산대학교 산학협력단 텅스텐카바이드-코발트 복합분말 제조방법

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6878182B2 (en) * 2001-12-19 2005-04-12 Seco Tools Ab Method of making tungsten carbide based hard metals
US7094821B2 (en) * 2002-12-02 2006-08-22 Seco Tools Ab Method of making tungsten carbide based hard metal tools or components
WO2004112997A1 (fr) * 2003-06-25 2004-12-29 Jawahar Lal Nehru University Procede et appareil permettant de produire des nanoparticules metalliques
KR20060041394A (ko) * 2004-11-08 2006-05-12 재단법인 포항산업과학연구원 용사코팅용 나노구조 텅스텐 카바이드-코발트계 분말의 제조 방법
KR20070024041A (ko) * 2005-08-26 2007-03-02 한국전기연구원 액중 전기폭발에 의한 나노분말 제조 방법 및 장치
KR20090017021A (ko) * 2007-08-13 2009-02-18 울산대학교 산학협력단 텅스텐카바이드-코발트 복합분말 제조방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YOUNG SOON KWON ET AL.: "Preparation of Nano Metal Carbide Powders by Electric Explosion of Conductors in Liquid Hydrocarbons.", J. IND. ENG. CHEM., vol. 10, no. 6, 2004, pages 949 - 953 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10538829B2 (en) 2013-10-04 2020-01-21 Kennametal India Limited Hard material and method of making the same from an aqueous hard material milling slurry
CN105499557A (zh) * 2016-01-28 2016-04-20 河南中硬合金有限公司 一种硬质合金大制品顶锤多元组分成型剂及制备方法

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