WO2007004836A1 - A manufacturing method of metal fine particles feedstock for powder injection molding - Google Patents
A manufacturing method of metal fine particles feedstock for powder injection molding Download PDFInfo
- Publication number
- WO2007004836A1 WO2007004836A1 PCT/KR2006/002591 KR2006002591W WO2007004836A1 WO 2007004836 A1 WO2007004836 A1 WO 2007004836A1 KR 2006002591 W KR2006002591 W KR 2006002591W WO 2007004836 A1 WO2007004836 A1 WO 2007004836A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fine particles
- injection molding
- metal fine
- powder injection
- metal
- Prior art date
Links
- 239000010419 fine particle Substances 0.000 title claims abstract description 72
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 69
- 239000002184 metal Substances 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 239000000843 powder Substances 0.000 title claims abstract description 38
- 238000001746 injection moulding Methods 0.000 title claims abstract description 34
- 239000011230 binding agent Substances 0.000 claims abstract description 28
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- 239000003960 organic solvent Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000010298 pulverizing process Methods 0.000 claims abstract description 10
- 229910001413 alkali metal ion Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 150000007524 organic acids Chemical class 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 5
- 239000011368 organic material Substances 0.000 claims description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 3
- 239000002211 L-ascorbic acid Substances 0.000 claims description 3
- 235000000069 L-ascorbic acid Nutrition 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 6
- 150000004706 metal oxides Chemical class 0.000 abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 239000002923 metal particle Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000000498 ball milling Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000008204 material by function Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229940032007 methylethyl ketone Drugs 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/88—Adding charges, i.e. additives
- B29B7/90—Fillers or reinforcements, e.g. fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
- B29B2009/125—Micropellets, microgranules, microparticles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
- B29B2009/168—Removing undesirable residual components, e.g. solvents, unreacted monomers; Degassing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
- B29K2105/162—Nanoparticles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2505/00—Use of metals, their alloys or their compounds, as filler
- B29K2505/02—Aluminium
Definitions
- the present invention relates to a manufacturing method of metal fine particles feedstock for powder injection mold, more particularly, to a manufacturing method of metal fine particles feedstock for powder injection mold, which enables to manufacture the feedstock for powder injection molding, consisted of at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than lOOnm, which can be completely condensified.
- thermal treatment is indispensable for the hydro-reduction process, and agglomerated particles which are difficult to pulverize are produced together with the growth of the reduced fine metal particles.
- the size of the agglomerated particles is approximately within some micrometers, to thereby cause problems in the application to the process of manufacturing the powder injection molding to manufacture high functional products of complex form.
- the powder injection molding process is indispensable to manufacture high functional materials of a complex form. It requires a process of mixing the metal fine particles with organic binder to apply to the powder injection molding process, and heating is performed to give mobility to the organic binder.
- the metal fine particles can be oxidized because the temperature is increased to a level where the metal particles can easily react with oxygen.
- the above conventional art is to mix the metal fine particles with the organic binder by increasing the temperature in the chamber maintained with an inert atmosphere to solve such problems, and the feedstock can be manufactured without oxidizing the metal of low oxidation force.
- an object of the present invention is to provide a manufacturing method of metal fine particles for powder injection molding, which enables to obtain the feedstock for the powder injection molding of the fine particles, which can be completely condensified after the sintering and simply dispersed without the agglomeration, and concurrently to manufacture the feedstock for the powder injection molding without the oxidation of the metal fine particles of strong oxidation force, not to mention to manufacture the feedstock for powder injection molding without the oxidation of the metal fine particles with a separate device maintained with inert gas.
- the present invention provides a manufacturing method of metal fine particles feedstock for powder injection molding, comprising first step of manufacturing metal fine particles of a size below lOOnm by applying electric current alternating periodically in direction and magnitude with time, after supplying a little amount of alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; second step of adding organic binder for powder injection molding into the container passed through the first step; third step of solving the added organic binder and mixing it with fine particles uniformly; and fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container.
- hydroxides including Na, Li, and K, or chemicals may be solved in at least one of the water or the organic solvent so that alkali metal ions are existed.
- At least one of reducing agent or organic acid may be added to suppress the oxidation of the metal fine particles.
- Another metal fine particles manufactured by adding reducing agent or organic acid may be mixed with the metal fine particles obtained through the first step, and organic materials or chemicals comprising 3-oxo-L-gulofuranolactone, 2-hydroxy-l,2,3-propanetricarboxylic acid, and the like may be used as the reducing agent or the organic acid.
- the feedstock for powder injection molding comprises at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than 10OD, which can be completely condensified, and to manufacture the feedstock for powder injection molding without using a separate device to inhibit oxidation and excluding the oxidation reaction.
- the present invention has advantages of applying diversely to high functional materials with complex forms, because it is possible to manufacture the feedstock for powder injection molding consisted of all alloys or complex group metal fine particles by suppressing oxidation of the fine particles.
- FlG. 1 is an enlarged photograph of fine particles showing one embodiment of the present invention
- FlG. 2 is a photograph showing an outer appearance of aluminum fine particles feedstock manufactured through one embodiment of the present invention
- FlG. 3 is a graphic view showing results of x-ray diffraction analysis of the of aluminum fine particles feedstock manufactured through one embodiment of the present invention.
- the present invention comprises first step of manufacturing metal fine particles of a size below IOOD by applying electric current alternating periodically in direction and magnitude with time, after supplying a little amount of alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; [29] second step of adding organic binder for powder injection molding into the container passed through the first step; [30] third step of solving the added organic binder and mixing it with fine particles uniformly; and [31] fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container. [32] In other words, the present invention manufactures the feedstock for the powder injection molding through making metal fine particles in the water or organic solvent, and mixing it with organic binder at the un-dried state, and then dry and pulverizes it.
- the drying was performed by usual natural dry or in usual drying chamber, and the pulverization was performed by means of a usual pulverizing device or performed manually by the worker, and the pulverization size was not limited.
- metal fine particles mono dispersed in the water or organic solvent are manufactured by solving alkali metal in the above solvent, and immersing the objected metal in the solution as electrode, and applies electric current, which alternates periodically in direction and magnitude with time.
- Such electric current has a waveform of sine wave, square wave, triangular wave, sawtooth wave, and the like.
- Metal is ionized by the energy of the electric current having such waveforms, and the ionized metal is reduced by receiving electrons from alkali metal reduced by the electrons received from the electrode to thereby be transformed into fine particles of metal phase.
- the metal fine particles manufactured through such processes are dispersed into the solvent, so that they do not form a strong agglomerated particles.
- materials functioning as reducing agent are added to the solvent to prevent the metal fine particles from being oxidized or an organic acid is added to increase the concentration of hydrogen ion.
- organic acid or chemicals containing 3-oxo-L-gluofuranolactone can be exemplified, however, such materials are not limited.
- the mono dispersed metal fine particles feedstock is manufactured through a process of adding organic binder soluble to respective solvent to materials containing metal fine particles manufactured by applying the electric current, a process of mixing uniformly, and a process of evaporating the solvent.
- organic binder at least one organic material usually used in the powder injection molding can be used.
- organic material usually used in the powder injection molding polyethylene, polyvinylalcohol, stearic acid, and wax group can be exemplified, and organic binder used usually can be used.
- the feedstock by manufacturing oxide particles without adding reducing agent or organic acid to the water or organic solvent, manufacturing another metal fine particles by adding the reducing agent or the organic acid, and mixing the manufactured at least two fine particles and adding organic binder to obtain the feedstock made by mixing the oxide particles with the metal particles.
- Solvent is prepared by solving 3-oxo-L-gulofuranolactone to increase the concentration of the hydrogen ion after solving sodium acetate in alcohol. Then, sine wave electric current is applied after immersing two aluminum electrodes into the prepared solvent. When the aluminum particles are manufactured from alcohol, heating them to about 70°C to thereby solving the added organic binder with adding and stirring stearic acid, and polyethylene. Then, the aluminum fine particles feedstock is manufactured by removing alcohol component in the vacuum drying device after stirring sufficiently.
- FlG. 1 is a photograph obtained by observing aluminum fine particles manufactured according to the example by means of a transmission electronic microscopy. The size of the aluminum fine particles is about 5D.
- FlG. 2 is a photograph showing an outer appearance of aluminum fine particles feedstock manufactured through the example, and FlG. 3 is a graphic view showing results of x-ray diffraction analysis of the aluminum fine particles feedstock manufactured through the example. It can be seen that the aluminum exists as metal phase aluminum without being oxidized.
- the feedstock for powder injection molding comprises at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than 10OD, which can be completely condensified, and to manufacture the feedstock for powder injection molding without using separate device to inhibit oxidation and excluding the oxidation reaction.
- the present invention has advantage of applying diversely to high functional materials with complex forms, because it is possible to manufacture the feedstock for powder injection molding consisted of all alloys or complex group metal fine particles by suppressing oxidation of the fine particles.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention relates to a manufacturing method of metal fine particles for powder injection molding, and especially, it features by comprising first step of manufacturing metal fine particles of a size below IOOD by applying electric current alternating periodically in direction and magnitude with time, after supplying a little amount of alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; second step of adding organic binder for powder injection molding into the container passed through the first step; third step of solving the added organic binder and mixing it with fine particles uniformly; and fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container. Accordingly, the present invention has advantages that it is possible to manufacture the feedstock for powder injection molding comprising at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than IOOD, which can be completely con- densified, and to manufacture the feedstock for powder injection molding without using a separate device to inhibit oxidation and excluding the oxidation reaction.
Description
Description
A MANUFACTURING METHOD OF METAL FINE PARTICLES FEEDSTOCK FOR POWDER INJECTION MOLDING
Technical Field
[1] The present invention relates to a manufacturing method of metal fine particles feedstock for powder injection mold, more particularly, to a manufacturing method of metal fine particles feedstock for powder injection mold, which enables to manufacture the feedstock for powder injection molding, consisted of at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than lOOnm, which can be completely condensified. Background Art
[2] Referring now to a conventional manufacturing method of metal fine particles and a manufacturing method of feedstock for powder injection molding using the same, there was disclosed a Korea patent registration No. 0408647 entitled with "A manufacturing method for a high purity alloy and complex nanometer metal powder"in which fine metal particles could be manufactured by pulverizing metal oxide by using supersonic ball milling at first, and then performing the hydro-reduction thereof. Thus, the conventional art is to obtain metal fine particles by pulverizing oxide without the mingling of the impurities and performing the hydro-reduction.
[3] However, it is impossible to manufacture the metal hard to obtain the oxide thereof, and it is impossible to obtain the metal fine particles from the metal oxide incapable of being reduced by hydrogen.
[4] For instance, it is very difficult to obtain the oxide from the metal belonged to noble metals, and it is very high of price in comparison with the price of metal, even if it is possible to obtain the oxide from the noble metals.
[5] Also, aluminum oxide, chromium oxide, zinc oxide, titanium oxide, and the like are not reduced by hydrogen.
[6] Another problem of the conventional art is that thermal treatment is indispensable for the hydro-reduction process, and agglomerated particles which are difficult to pulverize are produced together with the growth of the reduced fine metal particles.
[7] The size of the agglomerated particles is approximately within some micrometers, to thereby cause problems in the application to the process of manufacturing the powder injection molding to manufacture high functional products of complex form.
[8] Furthermore, organic binder cannot penetrate into the inside of the agglomerated particles and the remain of the space to thereby produces cracks of the molds due to the expansion of the gas caused by the heat in the process of removing the binder.
[9] Also, it is reported to be difficult to obtain the products completely condensified in a sintering process because very large air holes are remained between the agglomerated particles, although the penetration of the organic binder has been well accomplished.
[10] While the pulverization of the agglomerated particles can be induced by performing the ball milling with solvents such as alcohol, and the like, and mixing with the organic binder, the ball milling energy cannot avoid the growth of the metal nanometer particles due to the compression, and the inflow of the impurities from the ball and the container for the ball milling.
[11] Furthermore, there was disclosed a Korea patent registration No. 0366773 entitled with "A manufacturing method of nanometer metal powder feedstock for metal injection molding"in which the feedstock was manufactured by mixing organic binder with metal fine particles together with heating in a chamber maintaining with the inert atmosphere at 7~200°C to avoid the oxidation reaction, to manufacture the feedstock for powder injection molding by using the metal fine particles. In this instance, the metal particles easily react with oxygen because the metal particles are of good reaction property.
[12] Also, the powder injection molding process is indispensable to manufacture high functional materials of a complex form. It requires a process of mixing the metal fine particles with organic binder to apply to the powder injection molding process, and heating is performed to give mobility to the organic binder.
[13] It is obvious that the metal fine particles can be oxidized because the temperature is increased to a level where the metal particles can easily react with oxygen.
[14] Accordingly, the above conventional art is to mix the metal fine particles with the organic binder by increasing the temperature in the chamber maintained with an inert atmosphere to solve such problems, and the feedstock can be manufactured without oxidizing the metal of low oxidation force.
[15] However, with regard to a metal such as aluminum, it is very difficult to maintain the inert gas atmosphere at such conditions, because it begins to oxidize thermody- namically from the partial pressure of the oxygen at about 10"100 atm.
[16] Furthermore, there was a problem about the expense that workability was very low and additional expense should be paid to the devices because all processes should be performed manually in the chamber. Disclosure of Invention Technical Problem
[17] Accordingly, the present invention was devised to solve such conventional problems, and an object of the present invention is to provide a manufacturing method of metal fine particles for powder injection molding, which enables to obtain the
feedstock for the powder injection molding of the fine particles, which can be completely condensified after the sintering and simply dispersed without the agglomeration, and concurrently to manufacture the feedstock for the powder injection molding without the oxidation of the metal fine particles of strong oxidation force, not to mention to manufacture the feedstock for powder injection molding without the oxidation of the metal fine particles with a separate device maintained with inert gas. Technical Solution
[18] To achieve the above object, the present invention provides a manufacturing method of metal fine particles feedstock for powder injection molding, comprising first step of manufacturing metal fine particles of a size below lOOnm by applying electric current alternating periodically in direction and magnitude with time, after supplying a little amount of alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; second step of adding organic binder for powder injection molding into the container passed through the first step; third step of solving the added organic binder and mixing it with fine particles uniformly; and fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container.
[19] Also, according to the present invention, hydroxides including Na, Li, and K, or chemicals may be solved in at least one of the water or the organic solvent so that alkali metal ions are existed.
[20] In addition, according to the present invention, at least one of reducing agent or organic acid may be added to suppress the oxidation of the metal fine particles.
[21] Furthermore, another metal fine particles manufactured by adding reducing agent or organic acid may be mixed with the metal fine particles obtained through the first step, and organic materials or chemicals comprising 3-oxo-L-gulofuranolactone, 2-hydroxy-l,2,3-propanetricarboxylic acid, and the like may be used as the reducing agent or the organic acid. Advantageous Effects
[22] Therefore, according to the present invention, it is possible to manufacture the feedstock for powder injection molding comprises at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than 10OD, which can be completely condensified, and to manufacture the feedstock for powder injection molding without using a separate device to inhibit oxidation and excluding the oxidation reaction.
[23] In addition, the present invention has advantages of applying diversely to high functional materials with complex forms, because it is possible to manufacture the
feedstock for powder injection molding consisted of all alloys or complex group metal fine particles by suppressing oxidation of the fine particles.
Brief Description of the Drawings [24] FlG. 1 is an enlarged photograph of fine particles showing one embodiment of the present invention; [25] FlG. 2 is a photograph showing an outer appearance of aluminum fine particles feedstock manufactured through one embodiment of the present invention; [26] FlG. 3 is a graphic view showing results of x-ray diffraction analysis of the of aluminum fine particles feedstock manufactured through one embodiment of the present invention.
Mode for the Invention [27] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the appended drawings. [28] The present invention comprises first step of manufacturing metal fine particles of a size below IOOD by applying electric current alternating periodically in direction and magnitude with time, after supplying a little amount of alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; [29] second step of adding organic binder for powder injection molding into the container passed through the first step; [30] third step of solving the added organic binder and mixing it with fine particles uniformly; and [31] fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container. [32] In other words, the present invention manufactures the feedstock for the powder injection molding through making metal fine particles in the water or organic solvent, and mixing it with organic binder at the un-dried state, and then dry and pulverizes it.
In this instance, the drying was performed by usual natural dry or in usual drying chamber, and the pulverization was performed by means of a usual pulverizing device or performed manually by the worker, and the pulverization size was not limited. [33] More concretely speaking, metal fine particles mono dispersed in the water or organic solvent (alcohol, acetone, MEK (methyl-ethyl-ketone), benzene, toluene, and the like) are manufactured by solving alkali metal in the above solvent, and immersing the objected metal in the solution as electrode, and applies electric current, which alternates periodically in direction and magnitude with time. [34] Such electric current has a waveform of sine wave, square wave, triangular wave, sawtooth wave, and the like.
[35] Metal is ionized by the energy of the electric current having such waveforms, and the ionized metal is reduced by receiving electrons from alkali metal reduced by the electrons received from the electrode to thereby be transformed into fine particles of metal phase.
[36] The metal fine particles manufactured through such processes are dispersed into the solvent, so that they do not form a strong agglomerated particles. In this instance, materials functioning as reducing agent are added to the solvent to prevent the metal fine particles from being oxidized or an organic acid is added to increase the concentration of hydrogen ion. For instance, organic acid or chemicals containing 3-oxo-L-gluofuranolactone can be exemplified, however, such materials are not limited.
[37] As described above, the mono dispersed metal fine particles feedstock is manufactured through a process of adding organic binder soluble to respective solvent to materials containing metal fine particles manufactured by applying the electric current, a process of mixing uniformly, and a process of evaporating the solvent.
[38] As for the adding of organic binder, at least one organic material usually used in the powder injection molding can be used. In this regard, polyethylene, polyvinylalcohol, stearic acid, and wax group can be exemplified, and organic binder used usually can be used.
[39] When the water or organic solvent is removed from the organic binder, it is reduced to its original organic material to form a state mixed with the metal fine particles.
[40] It is possible to obtain an alloy or a complex powder by using the electrode as at least two metals to be manufactured, or by adding at least two metal particles and adding organic binder at the mixed state of the metal fine particles and the solvent after manufacturing the metal particles respectively to obtain alloy or complex powder using a lot of metal particles.
[41] Furthermore, it is possible to manufacture the feedstock by manufacturing oxide particles without adding reducing agent or organic acid to the water or organic solvent, manufacturing another metal fine particles by adding the reducing agent or the organic acid, and mixing the manufactured at least two fine particles and adding organic binder to obtain the feedstock made by mixing the oxide particles with the metal particles.
[42] Hereinafter, the present invention will be described in more detail with reference to the example.
[43] [Example]
[44] Solvent is prepared by solving 3-oxo-L-gulofuranolactone to increase the concentration of the hydrogen ion after solving sodium acetate in alcohol. Then, sine wave electric current is applied after immersing two aluminum electrodes into the prepared solvent. When the aluminum particles are manufactured from alcohol, heating them to
about 70°C to thereby solving the added organic binder with adding and stirring stearic acid, and polyethylene. Then, the aluminum fine particles feedstock is manufactured by removing alcohol component in the vacuum drying device after stirring sufficiently.
[45] FlG. 1 is a photograph obtained by observing aluminum fine particles manufactured according to the example by means of a transmission electronic microscopy. The size of the aluminum fine particles is about 5D. FlG. 2 is a photograph showing an outer appearance of aluminum fine particles feedstock manufactured through the example, and FlG. 3 is a graphic view showing results of x-ray diffraction analysis of the aluminum fine particles feedstock manufactured through the example. It can be seen that the aluminum exists as metal phase aluminum without being oxidized. Industrial Applicability
[46] As described above, according to the present invention, it is possible to manufacture the feedstock for powder injection molding comprises at least one metal fine particles, or at least one metal oxide and metal fine particles having a size of not more than 10OD, which can be completely condensified, and to manufacture the feedstock for powder injection molding without using separate device to inhibit oxidation and excluding the oxidation reaction.
[47] In addition, the present invention has advantage of applying diversely to high functional materials with complex forms, because it is possible to manufacture the feedstock for powder injection molding consisted of all alloys or complex group metal fine particles by suppressing oxidation of the fine particles.
Claims
[1] A manufacturing method of metal fine particles feedstock for powder injection molding, comprising: first step of manufacturing metal fine particles of a size below IOOD by applying electric current alternating periodically in direction and magnitude with time, after supplying alkali metal ions into a container filled with at least one of water or organic solvent and concurrently arranging at least two metal electrodes in the container; second step of adding organic binder for powder injection molding into the container passed through the first step; third step of solving the added organic binder and mixing it with fine particles uniformly; and fourth step of pulverizing the organic binder and fine particles mixture in the container after removing the water or the organic solvent in the container.
[2] The manufacturing method of metal fine particles feedstock for powder injection molding according to claim 1, wherein chemicals including Na, Li, and K are solved in at least one of the water or the organic solvent so that alkali metal ions are existed.
[3] The manufacturing method of metal fine particles feedstock for powder injection molding according to claim 1, wherein at least one of reducing agent or organic acid is added to suppress the oxidation of the metal fine particles.
[4] The manufacturing method of metal fine particles feedstock for powder injection molding according to claim 1, wherein another metal fine particles manufactured by adding reducing agent or organic acid are mixed with the metal fine particles obtained through the first step.
[5] The manufacturing method of metal fine particles feedstock for powder injection molding according to claim 3, wherein organic materials or chemicals comprising 3-oxo-L-gulofuranolactone, 2-hydroxy- 1 ,2,3-propanetricarboxylic acid are used as the reduction agent or the organic acid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050060092A KR100707855B1 (en) | 2005-07-05 | 2005-07-05 | Manufacturing method of metal fine particles-feedstock for powder injection molding |
| KR10-2005-0060092 | 2005-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007004836A1 true WO2007004836A1 (en) | 2007-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2006/002591 WO2007004836A1 (en) | 2005-07-05 | 2006-07-03 | A manufacturing method of metal fine particles feedstock for powder injection molding |
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| Country | Link |
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| KR (1) | KR100707855B1 (en) |
| WO (1) | WO2007004836A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013017140A1 (en) * | 2011-08-02 | 2013-02-07 | Gkn Sinter Metals Holding Gmbh | Binder mixture for producing moulded parts using injection methods |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022139186A1 (en) * | 2020-12-21 | 2022-06-30 | 코오롱플라스틱 주식회사 | Method for preparing feedstock for powder injection molding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01156401A (en) * | 1987-12-14 | 1989-06-20 | Kawasaki Steel Corp | Raw material for injection-molding metal powder and its using method |
| JPH0748166A (en) * | 1993-08-06 | 1995-02-21 | Murata Mfg Co Ltd | Composition for injection molding |
| KR100366773B1 (en) * | 2000-03-29 | 2003-01-09 | 이재성 | Manufacturing method of nano-metal feedstock for metal injection molding |
| KR20050059280A (en) * | 2002-10-29 | 2005-06-17 | 바스프 악티엔게젤샤프트 | Metal powder injection molding material and metal powder injection molding method |
-
2005
- 2005-07-05 KR KR1020050060092A patent/KR100707855B1/en active IP Right Grant
-
2006
- 2006-07-03 WO PCT/KR2006/002591 patent/WO2007004836A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01156401A (en) * | 1987-12-14 | 1989-06-20 | Kawasaki Steel Corp | Raw material for injection-molding metal powder and its using method |
| JPH0748166A (en) * | 1993-08-06 | 1995-02-21 | Murata Mfg Co Ltd | Composition for injection molding |
| KR100366773B1 (en) * | 2000-03-29 | 2003-01-09 | 이재성 | Manufacturing method of nano-metal feedstock for metal injection molding |
| KR20050059280A (en) * | 2002-10-29 | 2005-06-17 | 바스프 악티엔게젤샤프트 | Metal powder injection molding material and metal powder injection molding method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013017140A1 (en) * | 2011-08-02 | 2013-02-07 | Gkn Sinter Metals Holding Gmbh | Binder mixture for producing moulded parts using injection methods |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100707855B1 (en) | 2007-04-17 |
| KR20070005992A (en) | 2007-01-11 |
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