WO2010024474A1 - Method for producing wc-co composite powder - Google Patents

Method for producing wc-co composite powder 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
French (fr)
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.)
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Priority to PCT/KR2008/004944 priority Critical patent/WO2010024474A1/en
Publication of WO2010024474A1 publication Critical patent/WO2010024474A1/en

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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.

Abstract

A method for producing WC-Co composite powder comprising 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 is provided. According to the method for producing WC-Co composite powder of the present invention, as the result of exploding a cobalt metal wire in the slurry prepared by mixing WC powder and a fluid, cobalt powder behaving as a matrix phase can essentially be protected from oxidation, the WC powder can form a homogeneously blended composite together with the cobalt metal powder, and the resulting WC-Co composite powder contributes to high strength of hard metal cemented carbide, which is advantageous as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products.

Description

Title: METHOD FOR PRODUCING WC-CO COMPOSITE POWDER
TECHNICAL FIELD
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.
BACKGROUND ART
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.
Meanwhile, a technique for the synthesis of an ultra-fine WC-Co composite powder was introduced after 1990, i.e., spray drying an aqueous solution of W and Co by the use of a water-soluble metal sole, is going to be commercialized soon.
However, the synthesis method by solid state reaction has some limitation; for example, it is hard to obtain WC powder having a particle size of 0.5μm or less through the mechanical pulverization. Also, 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 μm or less simply by drying the aqueous solution and growing WC powder under deoxidation/carburization/heat treatment conditions. Besides, 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.
DISCLOSURE TECHNICAL PROBLEM
It is, therefore, 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.
Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
TECHNICAL SOLUTION
In accordance with an aspect of the present invention, there is provided 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.
For the preparation step of a 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.
Preferably, 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.
ADVANTAGEOUS EFFECTS
The method for producing WC-Co composite powder according to the present invention has the following advantages.
First, as a result of exploding a cobalt metal wire in a slurry prepared by mixing WC powder and a fluid, 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.
Second, with the help of a binder and a dispersant added to the slurry, the WC powder together with the cobalt metal powder form a homogeneously blended composite at a higher efficiency.
Third, 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.
BRIEF DESCRIPTION OF THE DRAWINGS
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.
BEST MODE FOR THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be explained in detail with reference to accompanying drawings. Before the present method is disclosed and described, one should notice that the terminology used in the specification and any of the claims are not to be interpreted by general meaning commonly known to an ordinary skilled person in the art or definitions in dictionary only, but should be understood as meaning and concept suitable for technical idea of the present invention, on the basis of the principle that an inventor is able to define the concept of a certain term for the purpose of describing his invention in the best way.
Therefore, the embodiments described herein and the construction illustrated in the drawings are for the purpose of describing a particular embodiment only, and are not intended to be limiting or representing all the technical ideas the present invention try to convey. Therefore, one should notice that there are many alternatives, modifications, and variations that can act as a substitute for them at the time of filing. The following will now explain a method for producing WC-Co composite powder in accordance with one embodiment of the present invention, with reference to Figs. 1 through 4.
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, and 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 according to an embodiment of the present invention 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. Moreover, 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.
Further, 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. Examples of such 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. When 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.
In one embodiment of the present invention, 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.
As an example, the electric explosion step (S 120) is carried out using a device shown in Fig. 2. As a result of exploding a cobalt metal wire in the slurry prepared, 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.
With reference to Fig. 3, in the slurry preparation step (S110), 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. 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.
In accordance with the present invention, 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. Lastly, the collection process (S140) is for collecting the remaining WC-
Co composite powder after the fluid has been dried or evaporated through the drying process (S130). The collected WC-Co composite powder may be advantageously used as a raw material for manufacturing carbide tools, abrasion resistant parts, and die products. While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

CLAIMS :
1. A method for producing WC-Co composite powder, comprising the steps of: a) mixing WC powder and a fluid to prepare a slurry; b) electrically exploding a cobalt metal wire in the slurry; and c) drying the fluid contained in the slurry.
2. The method of claim 1 , wherein the slurry preparation step is carried out in presence of a 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, and alkanol amides of fatty acids, which are used singly or in combination of two or more; or in presence of a binder selected from the group consisting of 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.
3. The method of claim 1 , wherein the fluid 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, which are used singly or in combination of two or more.
PCT/KR2008/004944 2008-08-25 2008-08-25 Method for producing wc-co composite powder WO2010024474A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105499557A (en) * 2016-01-28 2016-04-20 河南中硬合金有限公司 Hard alloy large-product holding-up hammer multi-component forming agent and preparation method
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

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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 (en) * 2016-01-28 2016-04-20 河南中硬合金有限公司 Hard alloy large-product holding-up hammer multi-component forming agent and preparation method

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