WO2006046838A1 - Procede de fabrication d'aimants permanents anisotropes et isotropes ndfeb - Google Patents

Procede de fabrication d'aimants permanents anisotropes et isotropes ndfeb Download PDF

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Publication number
WO2006046838A1
WO2006046838A1 PCT/KR2005/003608 KR2005003608W WO2006046838A1 WO 2006046838 A1 WO2006046838 A1 WO 2006046838A1 KR 2005003608 W KR2005003608 W KR 2005003608W WO 2006046838 A1 WO2006046838 A1 WO 2006046838A1
Authority
WO
WIPO (PCT)
Prior art keywords
molded body
lower punches
permanent magnet
isotropic
powder
Prior art date
Application number
PCT/KR2005/003608
Other languages
English (en)
Inventor
Hyoung Tae Kim
Yoon Bae Kim
Jang Seok Son
Ju Won Jeon
Original Assignee
Tesla Co., Ltd.
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
Priority claimed from KR1020040086815A external-priority patent/KR100631184B1/ko
Priority claimed from KR1020040086816A external-priority patent/KR100631183B1/ko
Application filed by Tesla Co., Ltd. filed Critical Tesla Co., Ltd.
Priority to US11/718,312 priority Critical patent/US20090060773A1/en
Publication of WO2006046838A1 publication Critical patent/WO2006046838A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0266—Moulding; Pressing
    • 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
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0433—Nickel- or cobalt-based alloys
    • C22C1/0441—Alloys based on intermetallic compounds of the type rare earth - Co, Ni
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working

Definitions

  • the present invention relates to a fabrication method of isotropic and anisotropic
  • NdFeB type permanent magnets and more particularly to a fabrication method of isotropic and anisotropic NdFeB type permanent magnets in which the isotropic permanent magnets is manufactured in such a manner that a powder molded body of a freeform type, in which a NdFeB type powder based on Nd Fe B ferromagnetic phase is compression molded in normal temperature, is putted into a graphite mold, pre ⁇ determined pressure and electric current are applied to the powder molded body through upper and lower punches, and the powder molded body is contracted in the pressure direction, and the anisotropic permanent magnet is manufactured in such a manner that an isotropic permanent magnet molded body is adhered and fixed between upper and lower punches, the isotropic permanent magnet molded body is heated by applying a DC to the upper and lower punches, a predetermined pressure is applied to the upper and lower punches, and the molded body is contracted in the pressure direction of the upper and lower punches and expanded perpendicularly to the pressure direction of
  • a manufacturing process of a permanent magnet includes a hot process for manufacturing an isotropic magnet (see FIG. 1) and a hot deformation process for manufacturing an anisotropic magnet, in which the isotropic magnet manufactured by the hot process is compressed and transformed in high temperature and pressure as shown in FIG. 2.
  • Korean Patent No. 10-0424142 has been disclosed in that rare earth magnets are putted into the mold, a pressure of 50-150Mpa is applied to the upper and lower punches 2 and 3, and a DC of 450-4,000 A/cm is applied to the mold through the upper and lower punches 2 and 3 by means of the electrical device 4, thereby obtaining a permanent magnet 5 of a bulk status from the powder.
  • an object of the present invention is to provide a fabrication method of isotropic and anisotropic NdFeB type permanent magnets, in which the isotropic and anisotropic NdFeB type permanent magnets can be easily man ⁇ ufactured by means of Joule's heat using a self resistance of a powder molded body by directly applying a DC (Direct Current) to the powder molded body, without using external heating elements or high frequency coils and so on, during the fabrication thereof, and it is simple in terms of structure, during the fabrication thereof, thereby the manufacturing cost is low.
  • DC Direct Current
  • the present invention provides a fabrication method of an isotropic NdFeB type permanent magnet, comprising the steps of: putting a powder molded body of a freeform type, in which a NdFeB type powder is compression molded in normal temperature, into a graphite mold; adhering and fixing the powder molded body to upper and lower punches located at upper and lower parts thereof; applying a DC of 500-3,000A/cm to the upper and lower punches, whereby generating a resistance heat of 700-800 0 C into the powder molded body; applying a pressure of 10-150Mpa to the upper and lower punches; and cooling the isotropic permanent magnet, in which the powder molded body is contracted in the pressure direction of the upper and lower punches.
  • the isotropic permanent magnet in which the powder molded body is contr acted in the pressure direction of the upper and lower punches, is cooled in normal temperature.
  • the material of the mold for fixing the powder molded body is a metal or ceramic.
  • the present invention provides a fabrication method of an anisotropic NdFeB type permanent magnet, comprising the steps of: adhering and fixing a molded body of an isotropic permanent magnet between upper and lower punches; applying a DC of 500-3,000A/cm to the upper and lower punches, whereby generating a resistance heat of 700-800 0 C into the molded body; and applying a pressure of 50-200Mpa to the upper and lower punches, whereby contracting the molded body in the pressure direction of the upper and lower punches and expanding the molded body perpendicularly to the pressure direction of the upper and lower punches.
  • FIG. 1 is a schematic perspective view illustrating a fabrication method of a permanent magnet according to a conventional hot press process
  • FIG. 2 is a schematic perspective view illustrating a fabrication method of a permanent magnet according to a conventional hot deformation process
  • FIG. 3 is a schematic perspective view illustrating a fabrication method of a permanent magnet according to a conventional current applying
  • FIG. 4 is a schematic perspective view illustrating a fabrication method of an isotropic NdFeB type permanent magnet according to the present invention.
  • FIG. 5 is a schematic perspective view illustrating a fabrication method of an anisotropic NdFeB type permanent magnet according to another embodiment of the present invention.
  • FIG. 4 is a schematic perspective view illustrating a fabrication method of an isotropic NdFeB type permanent magnet according to the present invention.
  • a NdFeB type permanent magnet powder which is manufactured by rapidly solidifying the NdFeB type permanent magnet based on Nd Fe B ferromagnetic phase, or a powder molded body 110 of a freeform type, in which the NdFeB type permanent magnet powder is compression molded in normal temperature, are putted into a graphite mold 120.
  • the powder molded body 110 which is putted into the graphite mold 120, is adhered and fixed to upper and lower punches 130 and 140 located at upper and lower parts thereof.
  • the powder molded body 110 adhered and fixed to the upper and lower punches 130 and 140 is plastic- worked in such a manner that a DC (Direct Current) of 500-3,000A/cm is applied to the upper and lower punches 130 and 140 through an electrical device 150, so as to generate a resistance heat of 700-800 0 C into the powder molded body 110.
  • a pressure of 10-150Mpa is pressurized to the upper and lower punches 130 and 140 to mold the isotropic NdFeB type permanent magnet 160, in which the powder molded body 110 is contracted in the pressure direction of the upper and lower punches 130 and 140.
  • the reason for heating the resistance heat at 700-800 0 C is because that the plastic deformation of the powder molded body 110 cannot be generated into the graphite mold 120 or can be degraded.
  • the present invention is not limited to any intensity of the DC, it can be properly changed according to the diameter size per unit area of the powder molded body 110 and so on, which is located inside the graphite mold 120.
  • FIG. 5 is a schematic perspective view illustrating a fabrication method of an anisotropic NdFeB type permanent magnet according to another embodiment of the present invention.
  • a molded body 210 of an isotropic type permanent magnet is adhere and fixed between upper and lower punches 230 and 240 and then, the molded body 210 of an isotropic type permanent magnet adhered and fixed between the upper and lower punches 230 and 240 is plastic- worked in such a manner that a DC (Direct Current) of 500-3,000A/cm is applied to the upper and lower punches 230 and 240 through an electrical device 250.
  • DC Direct Current
  • the DC applied to the upper and lower punches 230 and 240 is flowed into the molded body 210 of an isotropic type permanent magnet and a resistance heat of 700-800 0 C is generated into the molded body 210 of the isotropic NdFeB type permanent.
  • a pressure of 50-200Mpa is pressurized to the upper and lower punches 230 and 240 to mold the anisotropic NdFeB type permanent magnet 220, in which the molded body 210 is contracted in the pressure direction of the upper and lower punches 230 and 240 and is expanded perpendicularly to the pressure direction of the upper and lower punches 230 and 240.
  • the reason for heating the resistance heat at 700-800 0 C is because that the plastic deformation of the molded body 210 cannot be generated into the graphite mold 120 or can be degraded.
  • the DC applied to the upper and lower punches 130 and 140 through the electrical device 150 is 500-3, 000 A/cm .
  • the present invention is not limited to any intensity of the DC, it can be properly changed according to the diameter size per unit area of the molded body 210.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication d'aimants permanents de type isotrope et anisotrope NdFeB. Dans ce procédé de fabrication, les aimants permanents de type isotrope et anisotrope NdFeB peuvent facilement être fabriqués au moyen du chauffage par effet de joule en utilisant l'autorésistance d'un corps moulé en poudre par application directe d'un courant continu (C.C) aux perforateurs supérieur et inférieur et au corps moulé en poudre, sans utiliser d'éléments chauffants externes ou deux bobines haute fréquence etc., durant le moulage par pression de la poudre d'aimant permanent au moyen des perforateurs. Ces aimants sont simples en terme de structure durant leur fabrication, de sorte que leur coût de fabrication est bas.
PCT/KR2005/003608 2004-10-28 2005-10-28 Procede de fabrication d'aimants permanents anisotropes et isotropes ndfeb WO2006046838A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/718,312 US20090060773A1 (en) 2004-10-28 2005-10-28 Manufacture Method of NDFEB Isotropic and Anisotropic Permanent Magnets

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020040086815A KR100631184B1 (ko) 2004-10-28 2004-10-28 ＮｄＦｅＢ계 등방성 영구자석의 제조방법
KR1020040086816A KR100631183B1 (ko) 2004-10-28 2004-10-28 ＮｄＦｅＢ계 이방성 영구자석의 제조방법
KR10-2004-0086816 2004-10-28
KR10-2004-0086815 2004-10-28

Publications (1)

Publication Number Publication Date
WO2006046838A1 true WO2006046838A1 (fr) 2006-05-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/003608 WO2006046838A1 (fr) 2004-10-28 2005-10-28 Procede de fabrication d'aimants permanents anisotropes et isotropes ndfeb

Country Status (2)

Country Link
US (1) US20090060773A1 (fr)
WO (1) WO2006046838A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009025086A1 (fr) 2007-08-20 2009-02-26 Intermetallics Co., Ltd. PROCÉDÉ DE FABRICATION D'UN AIMANT NdFeB FRITTÉ ET MOULE POUR FABRIQUER UN AIMANT NdFeB FRITTÉ
CN103846435A (zh) * 2012-12-07 2014-06-11 三环瓦克华（北京）磁性器件有限公司 一种复合模具
CN104827033A (zh) * 2015-04-15 2015-08-12 南京航空航天大学 一种电磁冲击在线增强激光熔化沉积金属的装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6947625B2 (ja) * 2017-12-25 2021-10-13 イビデン株式会社 焼結磁石の製造方法、ホットプレス用黒鉛型およびホットプレス用黒鉛型の製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02260615A (ja) * 1989-03-31 1990-10-23 Matsushita Electric Ind Co Ltd 準異方性永久磁石及びその製造方法
US5178691A (en) * 1990-05-29 1993-01-12 Matsushita Electric Industrial Co., Ltd. Process for producing a rare earth element-iron anisotropic magnet
JPH06244045A (ja) * 1993-02-16 1994-09-02 Matsushita Electric Ind Co Ltd 中空薄板希土類磁石の製造方法
KR20010108852A (ko) * 2000-05-31 2001-12-08 김형태 희토류계 영구자석의 제조방법

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DE68911502T2 (de) * 1988-06-21 1994-06-30 Matsushita Electric Ind Co Ltd Verfahren zur herstellung eines dauermagnetes.
JPH0344904A (ja) * 1989-07-12 1991-02-26 Matsushita Electric Ind Co Ltd 希土類・鉄系永久磁石の製造方法
JP2001332410A (ja) * 2000-05-22 2001-11-30 Seiko Epson Corp 磁石粉末、磁石粉末の製造方法およびボンド磁石
JP4243413B2 (ja) * 2000-05-31 2009-03-25 セイコーエプソン株式会社 磁石粉末の製造方法およびボンド磁石の製造方法
US20040025974A1 (en) * 2002-05-24 2004-02-12 Don Lee Nanocrystalline and nanocomposite rare earth permanent magnet materials and method of making the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02260615A (ja) * 1989-03-31 1990-10-23 Matsushita Electric Ind Co Ltd 準異方性永久磁石及びその製造方法
US5178691A (en) * 1990-05-29 1993-01-12 Matsushita Electric Industrial Co., Ltd. Process for producing a rare earth element-iron anisotropic magnet
JPH06244045A (ja) * 1993-02-16 1994-09-02 Matsushita Electric Ind Co Ltd 中空薄板希土類磁石の製造方法
KR20010108852A (ko) * 2000-05-31 2001-12-08 김형태 희토류계 영구자석의 제조방법

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009025086A1 (fr) 2007-08-20 2009-02-26 Intermetallics Co., Ltd. PROCÉDÉ DE FABRICATION D'UN AIMANT NdFeB FRITTÉ ET MOULE POUR FABRIQUER UN AIMANT NdFeB FRITTÉ
EP2187410A1 (fr) * 2007-08-20 2010-05-19 Intermetallics Co., Ltd. PROCÉDÉ DE FABRICATION D'UN AIMANT NdFeB FRITTÉ ET MOULE POUR FABRIQUER UN AIMANT NdFeB FRITTÉ
EP2187410A4 (fr) * 2007-08-20 2011-08-24 Intermetallics Co Ltd PROCÉDÉ DE FABRICATION D'UN AIMANT NdFeB FRITTÉ ET MOULE POUR FABRIQUER UN AIMANT NdFeB FRITTÉ
EP3091545A1 (fr) * 2007-08-20 2016-11-09 Intermetallics Co., Ltd. Moule pour la fabrication d'aimants frittés ndfeb
US9831034B2 (en) 2007-08-20 2017-11-28 Intermetallics Co., Ltd. Method for making NdFeB sintered magnet and mold for making the same
CN103846435A (zh) * 2012-12-07 2014-06-11 三环瓦克华（北京）磁性器件有限公司 一种复合模具
CN103846435B (zh) * 2012-12-07 2018-09-18 三环瓦克华（北京）磁性器件有限公司 一种复合模具
CN104827033A (zh) * 2015-04-15 2015-08-12 南京航空航天大学 一种电磁冲击在线增强激光熔化沉积金属的装置及方法

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