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Method for manufacturing alloy nano powdersRelated Patent Categories: Specialized Metallurgical Processes, Compositions For Use Therein, Consolidated Metal Powder Compositions, And Loose Metal Particulate Mixtures, Processes, Producing Or Purifying Free Metal Powder Or Producing Or Purifying Alloys In Powder Form (i.e., Named Or Of Size Up To 1,000 Microns In Its Largest Dimension), Utilizing Electrothermic, Magnetic, Or Wave EnergyMethod for manufacturing alloy nano powders description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070209477, Method for manufacturing alloy nano powders. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing alloy nanopowders, and in particular to an improved method for manufacturing alloy nanopowders using a wire which is manufactured in such a manner that at least one hetero metal is coated on a metal wire. BACKGROUND ART [0002] Metal nanopowders are manufactured by an electrical explosion method, a plasma method, a liquid phase method, a laser ablation method or a vapor deposition method etc. With the above methods it is not easy to manufacture alloy or multi-component nanopowders. A production rate is also very low. However, the electrical explosion method may have a relatively faster production rate as compared to the other methods. With this method, it is possible to manufacture nanopowders of diverse pure metals, oxides and nitrides. [0003] In the electrical explosion method, a high powder pulse of only a few microseconds duration is applied to a wire, which is fed into an argon-filled container. Under an impulse current of a very high intensity within a short reaction time, the metal wire is explosively convereted into a high-temperature vapor by the almost instantaneous discharge caused by energy release from a capacitor bank. With the current electrical explosion method, a wire with a diameter less than 1 mm (commonly 0.2.about.0.6 mm wire) is used when manufacturing the powders. [0004] In the case of pure metals, since a wire for the electrical explosion method has been commercially manufactured and available, there are not any problems for obtaining the materials. However, the alloy or intermetallic compound has some problems during its wire forming process as compared to the pure metals. Since alloy powders are mostly produced by small quantity batch production system, it is very difficult to obtain alloy wires of a specific composition in the market. [0005] So, it is urgently needed to develop a method that alloy nanopowders can be manufactured without using alloy and intermetallic compound wires as a raw material so as to expand an application range of the electrical explosion method so that nanopowders of diverse alloy and intermetallic compounds are manufactured. As one of the methods, a plurality of hetero pure metal wires are concurrently inserted and exploded. However, this method has not been successful yet. [0006] As an apparatus for manufacturing alloy nanopowders based on an electrical explosion method, there are Korean patent No. 10-0394390 (title: method and apparatus for manufacturing metal nanopowders based on electrical explosion method, registered on Jul. 30, 2003), Korean patent No. 10-0446956 (title: feeding apparatus of electrical explosion apparatus for nanopowder manufacture, registered on Aug. 24, 2003), Korean patent No. 10-0407160 (title: apparatus for manufacturing nanopowders, registered on Nov. 13, 2003), and Korean patent application No. 10-2004-0105378 (title: electrical explosion apparatus for nanopowder manufacture having thermodynamic and electrical stabilities, laid-open on Dec. 16, 2004). [0007] However, as a method for manufacturing alloy nanopowders, there is only one Korean patent No. 10-0551547 (title: metal, alloy or ceramic nanopowder manufacture method based on electrical explosion method in which a plurality of wires are concurrently inserted, registered on Feb. 6, 2006). In this Korean patent, a plurality of hetero metal wires are concurrently exploded. However, the above method is not actually adapted for applications. [0008] In particular, there are not disclosed a simple and low cost manufacturing method of alloy or intermetallic compound wires and an alloy nano powder manufacturing method by electrical explosion which does not use alloy or intermetallic compound wires. DISCLOSURE OF THE INVENTION [0009] Accordingly, it is an object of the present invention to provide a method for manufacturing alloy nanopowders without using alloy or intermetallic compound wires. [0010] In the present invention, there is disclosed a method of using a wire manufactured in such a manner that at least one hetero metal is coated on a metal wire so as to overcome the problems related to the raw material wire for electrical explosion. Here, the metal wire represents a pure metal wire, an alloy wire or an intermetallic compound wire. [0011] As a method of coating a certain metal or alloy on a metal wire, there are sputtering, evaporation, chemical vapor deposition, melt dipping, electroplating, and electroless plating methods, etc. Among the above methods, it is known that an electroplating method and an electroless plating method are capable of economically coating diverse metals. In addition, the electroplating method is capable of performing a continuous operation using a simple facility, so that the electroplating method may be automated in combination with the electrical explosion process. [0012] Therefore, a wire manufactured in such a manner that at least one hetero metal is coated on a metal wire by electroplating method, and the manufactured wire is used as a raw wire for the electrical explosion method for thereby manufacturing alloy nanopowders. Here, the kinds and compositions of the alloy of the alloy nanopowders may be controlled by the combination of metals and thickness of coated metal layer. BRIEF DESCRIPTION OF THE DRAWINGS [0013] The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein; [0014] FIG. 1 is a schematic illustrating an electroplating apparatus adapted to the present invention; [0015] FIG. 2 is a schematic illustrating an electrical explosion apparatus adapted to the present invention; [0016] FIG. 3 is a photograph of a nickel-copper coating wire according to the present invention; [0017] FIG. 4 is a X-ray diffraction (XRD) pattern of a nickel-copper alloy nanopowder manufactured according to the present invention; [0018] FIG. 5 is a transmission electron microscopy (TEM) micrograph of a nickel-copper alloy nanopowder manufactured according to the present invention; [0019] FIG. 6 is a X-ray diffraction (XRD) pattern of an aluminum-copper alloy nanopowder manufactured according to the present invention; and [0020] FIG. 7 is a transmission electron microscopy (TEM) micrograph of an aluminum-copper alloy nanopowder manufactured according to the present invention. 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