EP0255613A2 - Procédé pour la préparation d'aimants permanents bi- ou multipolaires à densité d'énergie magnétique élevée - Google Patents

Procédé pour la préparation d'aimants permanents bi- ou multipolaires à densité d'énergie magnétique élevée Download PDF

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Publication number
EP0255613A2
EP0255613A2 EP87109822A EP87109822A EP0255613A2 EP 0255613 A2 EP0255613 A2 EP 0255613A2 EP 87109822 A EP87109822 A EP 87109822A EP 87109822 A EP87109822 A EP 87109822A EP 0255613 A2 EP0255613 A2 EP 0255613A2
Authority
EP
European Patent Office
Prior art keywords
powder
magnets
permanent magnets
energy density
magnetic
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP87109822A
Other languages
German (de)
English (en)
Other versions
EP0255613A3 (en
EP0255613B1 (fr
Inventor
Hans E. Ing. Vogt
Valentin Dipl.-Ing. Tanach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
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
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Application filed by Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0255613A2 publication Critical patent/EP0255613A2/fr
Publication of EP0255613A3 publication Critical patent/EP0255613A3/de
Application granted granted Critical
Publication of EP0255613B1 publication Critical patent/EP0255613B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • H01F1/06—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 in the form of particles, e.g. powder
    • H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—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 in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • 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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • 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
    • H01F41/0273—Imparting anisotropy
    • 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

Definitions

  • the invention relates to a method for producing anisotropic permanent magnets of various shapes with a high magnetic energy density, these magnets being able to be oriented axially, radially or laterally with any number of pole pairs.
  • the various processes for producing the anisotropic permanent magnets are known.
  • the most commonly used process for the production of sintered anisotropic permanent magnets from powders is the pressing in a magnetic field and the subsequent sintering of the pressed parts.
  • Permanent magnets of various types are produced with a preferred direction in the pressing direction or transversely to the pressing direction.
  • Methods for pressing permanent magnets with a radial preferred direction from powders are restricted for magnets with a low height / diameter ratio or have weak magnetic properties.
  • Methods are also known for pressing pole-oriented ring magnets. These methods are disadvantageous due to the filling problems, poor orientation and cracks in the sintered parts.
  • Another method of making the sintered anisotropic magnets is the extrusion process. This process creates some radial anisotropy, but the resulting energy density is only slightly higher than that of the isotropic magnets.
  • a known method for the production of the anisotropic permanent magnets from powders is the binding of the powders with plastic and processing of the mass by pressing, spraying, calendering or extruding and impressing the preferred direction with mechanical or magnetic methods.
  • anisotropic plastic-bonded permanent magnets show generally better properties than the isotropic permanent magnets made of the same magnetic material and can also have different preferred directions, axially, diametrically, radially, multipole on the circumference. Due to the embedding in the plastic, the energy density is limited and the high values, such as those of the corresponding sintered permanent magnets, can never be achieved.
  • a method for the production of permanent magnets from hard ferrite with radial anisotropy by mixing the ferrite powder with a plastic, then calendering in foils under a magnetic field, then wound on a mandrel under pressure and a magnetic field, then the plastic is removed and finally sintered.
  • the magnetic values given are good, but the process is complicated and very complex and is only suitable for the radial preferred direction of the magnets.
  • the invention has for its object to develop an economical method, which on the one hand the most varied types of anisotropy embossing are possible (axial, diametrical, radial and in particular multi-pole laterally) and on the other hand achieve the high energy densities that are achieved with sintered anisotropic magnets, e.g. with axial preferential direction, are common.
  • the embossed orientation is not impaired by the sintering, so that the magnetic properties along the magnetic paths present during spraying have a complete anisotropy.
  • the magnetic values are similar to the anisotropic pressed and sintered magnets with axial anisotropy.
  • the method can be used for permanent magnets made from barium or strontium ferrite powder, from metal alloy powder, and also from rare earth magnet powder.
  • the magnetic properties are the same as above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP19870109822 1986-08-04 1987-07-08 Procédé pour la préparation d'aimants permanents bi- ou multipolaires à densité d'énergie magnétique élevée Revoked EP0255613B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863626360 DE3626360C2 (de) 1986-08-04 1986-08-04 Herstellungsvefahren für zwei- und mehrpolige Dauermagnete mit hoher magnetischer Energiedichte
DE3626360 1986-08-04

Publications (3)

Publication Number Publication Date
EP0255613A2 true EP0255613A2 (fr) 1988-02-10
EP0255613A3 EP0255613A3 (en) 1988-07-13
EP0255613B1 EP0255613B1 (fr) 1992-05-13

Family

ID=6306662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870109822 Revoked EP0255613B1 (fr) 1986-08-04 1987-07-08 Procédé pour la préparation d'aimants permanents bi- ou multipolaires à densité d'énergie magnétique élevée

Country Status (2)

Country Link
EP (1) EP0255613B1 (fr)
DE (1) DE3626360C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355704A1 (fr) * 1988-08-18 1990-02-28 Hitachi Metals, Ltd. Aimants permanents en terres rares anisotropiques, procédé pour les fabriquer
EP0331055B1 (fr) * 1988-02-29 1994-01-12 Matsushita Electric Industrial Co., Ltd. Procédé pour fabriquer un aimant lié à de la résine
DE102008052804A1 (de) * 2008-10-22 2010-04-29 Windhorst Beteiligungsgesellschaft Mbh Magnetischer Drehgeber und Verfahren zu seiner Herstellung
US10035095B2 (en) 2016-03-04 2018-07-31 General Electric Company Diverted pulse jet cleaning device and system
US20190143569A1 (en) * 2015-10-09 2019-05-16 Lexmark International, Inc. Injection-Molded Physical Unclonable Function

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420318C2 (de) * 1994-06-11 1996-04-11 Schulman A Gmbh Zusammensetzung auf Polymerbasis zur Herstellung von magnetischen und magnetisierbaren Formkörpern
DE4434471C1 (de) * 1994-09-27 1996-03-28 Bosch Gmbh Robert Verfahren zur Herstellung von Formkörpern aus Hartferriten
EP2632809B1 (fr) 2010-10-27 2015-11-18 Intercontinental Great Brands LLC Paquet contenant des produits et pouvant se fermer magnétiquement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1464249A1 (de) * 1963-11-16 1969-02-20 Leyman Corp Verfahren zur Herstellung von Permanentmagneten
US3596350A (en) * 1968-05-08 1971-08-03 Magnetfab Bonn Gmbh Process for the production of permanent magnets from anisotropic permanent magnet powder
DE3120501A1 (de) * 1981-05-22 1982-12-09 MTU Motoren- und Turbinen-Union München GmbH, 8000 München "verfahren und vorrichtung zur herstellung von formteilen"

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1284531B (de) * 1957-04-27 1968-12-05 Baermann Max Verfahren und Vorrichtung zur Herstellung von kunststoffgebundenen anisotropen Dauermagneten
DE2401934C3 (de) * 1974-01-16 1981-05-14 Fuji Electrochemical Co., Ltd., Tokyo Verfahren zur Herstellung eines anisotropen Ferritmagneten
DE3021607A1 (de) * 1980-06-09 1981-12-17 Philips Patentverwaltung Gmbh, 2000 Hamburg Rotor fuer eine elektrische maschine
DE3047701A1 (de) * 1980-12-18 1982-07-15 Magnetfabrik Bonn Gmbh Vorm. Gewerkschaft Windhorst, 5300 Bonn Verfahren zum herstellen von anisotropen dauermagneten und danach hergestellte rohrfoermige dauermagnete

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1464249A1 (de) * 1963-11-16 1969-02-20 Leyman Corp Verfahren zur Herstellung von Permanentmagneten
US3596350A (en) * 1968-05-08 1971-08-03 Magnetfab Bonn Gmbh Process for the production of permanent magnets from anisotropic permanent magnet powder
DE3120501A1 (de) * 1981-05-22 1982-12-09 MTU Motoren- und Turbinen-Union München GmbH, 8000 München "verfahren und vorrichtung zur herstellung von formteilen"

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331055B1 (fr) * 1988-02-29 1994-01-12 Matsushita Electric Industrial Co., Ltd. Procédé pour fabriquer un aimant lié à de la résine
EP0355704A1 (fr) * 1988-08-18 1990-02-28 Hitachi Metals, Ltd. Aimants permanents en terres rares anisotropiques, procédé pour les fabriquer
DE102008052804A1 (de) * 2008-10-22 2010-04-29 Windhorst Beteiligungsgesellschaft Mbh Magnetischer Drehgeber und Verfahren zu seiner Herstellung
US20190143569A1 (en) * 2015-10-09 2019-05-16 Lexmark International, Inc. Injection-Molded Physical Unclonable Function
US11356287B2 (en) 2015-10-09 2022-06-07 Lexmark International, Inc. Injection-molded physical unclonable function
US10035095B2 (en) 2016-03-04 2018-07-31 General Electric Company Diverted pulse jet cleaning device and system

Also Published As

Publication number Publication date
EP0255613A3 (en) 1988-07-13
EP0255613B1 (fr) 1992-05-13
DE3626360A1 (de) 1988-02-11
DE3626360C2 (de) 1995-06-22

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