EP0255816A2 - Procédé de préparation de poudre magnétiquement dure, résistant à la corrosion, pour la fabrication d'aimants; aimants fabriqués à partir de poudre magnétiquement dure et leur procédé de fabrication - Google Patents

Procédé de préparation de poudre magnétiquement dure, résistant à la corrosion, pour la fabrication d'aimants; aimants fabriqués à partir de poudre magnétiquement dure et leur procédé de fabrication Download PDF

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Publication number
EP0255816A2
EP0255816A2 EP87890182A EP87890182A EP0255816A2 EP 0255816 A2 EP0255816 A2 EP 0255816A2 EP 87890182 A EP87890182 A EP 87890182A EP 87890182 A EP87890182 A EP 87890182A EP 0255816 A2 EP0255816 A2 EP 0255816A2
Authority
EP
European Patent Office
Prior art keywords
powder
alloy
magnet
permanent
iron
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.)
Withdrawn
Application number
EP87890182A
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German (de)
English (en)
Other versions
EP0255816A3 (fr
Inventor
Herwig Dr. Winkler
Alexander Dr. Bouvier
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.)
Treibacher Chemische Werke AG
Original Assignee
Treibacher Chemische Werke AG
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Filing date
Publication date
Application filed by Treibacher Chemische Werke AG filed Critical Treibacher Chemische Werke AG
Publication of EP0255816A2 publication Critical patent/EP0255816A2/fr
Publication of EP0255816A3 publication Critical patent/EP0255816A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01F1/0578—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 bonded together
    • 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
    • H01F1/0572—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 with a protective layer
    • 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

  • Permanent magnet materials are a basic material for many electrical and electronic applications such as motors, microphones, loudspeakers, measuring devices etc. or for daily needs, e.g. as simple holding magnets.
  • ferrites, alnico magnets or rare earth cobalt magnets are mainly used for these purposes.
  • the low magnetic performance is a disadvantage of the first two types, it is the low availability of the SE raw material samarium and the high price of the connection for the SE cobalt magnets.
  • Great efforts have therefore been made to find a new alloy that is characterized on the one hand by good magnetic properties such as high coercive force and high remanence, and on the other hand by cheaper raw materials that are available in larger quantities.
  • the SE-Fe-B alloy is produced by melt metallurgy under vacuum or inert gas in order to prevent oxygen uptake by the rare earth metals, which tend to oxidize.
  • the alloy is produced in pieces or in the form of ingots. To improve the magnetic properties, it must be crushed.
  • the comminution of the alloy takes place either by atomization into powder (US Pat. No. 4,585,473) or in the so-called "melt spinning" process (US Pat. No. 4,496,395), whereby amorphous structures are formed, by a pressure roller or by Bre and grinding the alloy. In this way, the alloy particles are brought to grain sizes between 1 and 10 microns. With this fineness, they are extremely sensitive to oxidation.
  • the absorption of oxygen primarily binds the rare earth metal, eg neodymium, in the form of an oxide and is therefore no longer available for the Nd-Fe-B phase, which is responsible for achieving the hard magnetic properties. From a certain oxygen concentration, this leads to a significant loss of quality and, at higher values, even to a complete loss of magnetic properties.
  • the powders must therefore be protected against atmospheric oxygen, processed further under an inert gas atmosphere or in organic solvents. This is usually done by pressing, possibly with the application of an external magnetic field, whereby anisotropic or isotropic magnets are obtained.
  • the compacts are then sintered and the sinterings are subjected to a thermal aftertreatment to improve the magnetic properties. It is only through the process of sintering that the magnet regains extensive resistance to oxidation. Complete resistance of the magnet can only be achieved by coating it.
  • the magnets produced according to these described processes must therefore be subjected to a sintering treatment under vacuum or an inert gas atmosphere, which must run at over 1000 ° C and only leads to high-quality products in connection with a subsequent heat treatment. This represents a costly process step.
  • the powders produced according to the "melt spinning" process with subsequent comminution are usually embedded in plastic, resulting in isotropic magnets with a low energy product (BHmax).
  • the aim of the present invention is therefore a process for the production of corrosion-resistant, hard magnetic powders from an alloy of the basic type SE-Fe-B for magnet production, the magnetic powders produced in this way being distinguished by excellent resistance to oxidation and without sintering to isotropic or anisotropic magnets with high Coercivity and maximum energy product can be processed.
  • This aim is achieved according to the invention by combining the following process steps, that the starting alloy present in pieces or in the form of ingots is crushed, the powder particles thus obtained are heat-treated to improve their magnetic properties, preferably in a temperature range of 300-1000 ° C., and then the The surface of the individual heat-treated powder particles is coated with a ceramic or metallic protective layer to prevent corrosion, the metallic coating preferably being carried out electrolytically from an aqueous solution.
  • the powders produced by the process according to the invention can then, if appropriate with the addition of a pressing aid, be processed by simple pressing, if appropriate with application of an external magnetic field, to permanent magnets with excellent properties.
  • the invention also relates to a magnet made of hard magnetic powder, which is characterized in that the powder particles consist of an alloy containing 25-45% by weight SE, 0.5-3% by weight B and iron or a combination of iron contains at least one other metal from the group cobalt, aluminum and niobium and are coated with a ceramic or metallic protective layer.
  • the invention also relates to a method for Production of such a magnet, which consists in that the coated powder is optionally pressed into magnets under the action of an external magnetic field, the pressing preferably taking place with the addition of a plastic, a metal or ceramic powder to improve the strength of the compact.
  • the addition of other rare earths can increase certain properties, such as the coercive field strength.
  • Another component of the alloy is boron, which is necessary to form the hard magnetic phase and is present in quantities of 0.5-3% by weight.
  • the remainder of the alloy is iron or a combination of iron with another element, e.g. Cobalt, aluminum, niobium or others. The combination of iron with these elements can lead to an improvement in temperature resistance and magnetic properties.
  • the starting alloy is produced by the molten metal-lurgic route, it being of the utmost importance that the oxygen content be kept as low as possible so that the prerequisite for the production of the lowest possible oxygen powder is given.
  • An improvement in the magnetic properties of an atomized powder can be achieved if the alloy droplets move through a magnetic field during the atomization process and solidify in it. If the atomized alloy is ground briefly before the heat treatment, for example in a stirred ball mill under liquid, to an FSSS value of ⁇ 30 ⁇ m, preferably 15-3 ⁇ m, a magnetically anisotropic material is obtained, which also has a low oxygen content. Compared to the powders produced by the known "melt spinning" process with subsequent grinding, this comminution method is advantageous since the particles are also partially spherical after grinding and can therefore be coated more easily. To explain the importance of oxygen, Table 1 shows the oxygen contents of dry powders of an NdFeB alloy, which were finely divided for two hours and stored in air to determine 02 uptake, depending on the grain size.
  • Another necessary step in the manufacturing process according to the invention is the heat treatment of the powders.
  • the powders are transferred directly into a vacuum oven under solvent or in an inert gas atmosphere and subjected to heat treatment between 300 ° and 1000 ° C in one or more stages.
  • a heat treatment of the powder for example, increased the coercive field strength of a ground alloy with an FSSS value of 5 ⁇ m from 222.9 kA / m in the original material to 802 kA / m, which represents a significant improvement.
  • the production of the magnetic powder in the manner described is the prerequisite for achieving good magnetic properties.
  • a prerequisite for the corrosion resistance of the powder is a complete coating of the individual powder particles with a metallic or ceramic material.
  • a metal is deposited, for example, by an electrolytic process, as in the case of electrodeless coating with copper, which is described below:
  • An aqueous solution of copper sulfate, sodium hydroxide solution and potassium sodium tartrate is prepared, the alloy is stirred in and formaldehyde is added. The copper is deposited metallically on the surface of the powder.
  • the proportion of coating material varies depending on the fineness of the powder and the surface associated with it. It is between 10 and 25% for the previously described grain sizes. Just By applying a corrosion-resistant layer to each individual powder particle, however, there is sufficient resistance to corrosion of the powder and the magnets.
  • a lumpy NdFeB alloy with the following composition 33.3% SE (in 100% SE 98.7% Nd) 1.3% B 65.2% Fe 0.04% O was melted under an inert gas atmosphere, then atomized and a fraction ⁇ 63 ⁇ m was sieved out. It was then heat-treated at 630 ° C and then coated with copper without electrodes. For this purpose, the atomized and heat-treated alloy was stirred into an aqueous solution which contained 30 g / l CuSo4, 80 g / l 60% NaOH and 150 g / l KNa tartrate. Then 1 part by volume of 37% formaldehyde was added to 5 parts by volume of this solution. After the Cu had been deposited and the coated alloy had been filtered, it was washed thoroughly. It contained 13.2% Cu and 0.17% oxygen. Table 2 shows the values for the coercive field strength for the individual intermediates and the end material.
  • Example 2 A lumpy NdFeB alloy with the same composition as in Example 1 was melted under an inert gas atmosphere, atomized and the atomized material was ground under cyclohexane to an FSSS value of 5.2 ⁇ m in an attritor. The powder was placed in a vacuum oven while wet with solvent and heat-treated at 630 ° C. The coating was again carried out according to Example 1 and the powder had a copper content of 18.2% and an oxygen content of 0.27% O. Table 3 again summarizes the coercive field strengths.
EP87890182A 1986-08-04 1987-07-31 Procédé de préparation de poudre magnétiquement dure, résistant à la corrosion, pour la fabrication d'aimants; aimants fabriqués à partir de poudre magnétiquement dure et leur procédé de fabrication Withdrawn EP0255816A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT209386A AT386554B (de) 1986-08-04 1986-08-04 Verfahren zur herstellung korrosionsbestaendiger, hartmagnetischer pulver fuer die magneterzeugung, magnete aus hartmagnetischem pulver und verfahren zu deren herstellung
AT2093/86 1986-08-04

Publications (2)

Publication Number Publication Date
EP0255816A2 true EP0255816A2 (fr) 1988-02-10
EP0255816A3 EP0255816A3 (fr) 1988-12-21

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EP87890182A Withdrawn EP0255816A3 (fr) 1986-08-04 1987-07-31 Procédé de préparation de poudre magnétiquement dure, résistant à la corrosion, pour la fabrication d'aimants; aimants fabriqués à partir de poudre magnétiquement dure et leur procédé de fabrication

Country Status (3)

Country Link
EP (1) EP0255816A3 (fr)
JP (1) JPS6338216A (fr)
AT (1) AT386554B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0361308A1 (fr) * 1988-09-20 1990-04-04 Sumitomo Special Metals Co., Ltd. Aimant permanent résistant à la corrosion et sa méthode de fabrication
EP0392077A2 (fr) * 1989-04-14 1990-10-17 Hitachi Metals, Ltd. Aimants magnétiquement anisotropes travaillés à chaud, et composition et méthode pour leur fabrication
US4990876A (en) * 1989-09-15 1991-02-05 Eastman Kodak Company Magnetic brush, inner core therefor, and method for making such core
EP0452580A1 (fr) * 1990-04-19 1991-10-23 Seiko Epson Corporation Aimant à liant résineux et son procédé de fabrication
EP0504397A1 (fr) * 1990-10-09 1992-09-23 Iowa State University Research Foundation, Inc. Procede de fabrication d'aimants permanents
WO1999043862A1 (fr) * 1998-02-26 1999-09-02 The University Of Birmingham Procede d'application d'un revetement resistant a la corrosion
EP1022929A2 (fr) * 1999-01-23 2000-07-26 Harman Audio Electronic Systems GmbH Haut-parleur avec un noyau magnétique d'habillage
EP1211700A2 (fr) * 2000-11-30 2002-06-05 Tokin Corporation Noyau magnétique comprenant un aimant de polarisation et inductance l'utilisant
DE102013004985A1 (de) 2012-11-14 2014-05-15 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Permanentmagneten sowie Permanentmagnet
DE102013213494A1 (de) 2013-07-10 2015-01-29 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Permanentmagneten sowie Permanentmagnet und elektrische Maschine mit einem solchen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2623731B2 (ja) * 1988-07-29 1997-06-25 三菱マテリアル株式会社 希土類―Ｆｅ―Ｂ系異方性永久磁石の製造法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59155106A (ja) * 1983-02-23 1984-09-04 Hitachi Maxell Ltd 金属磁性粉末の製造法
EP0125752A2 (fr) * 1983-05-09 1984-11-21 General Motors Corporation Aimants comportant des particules du système terre rare-fer et un liant
JPS6054406A (ja) * 1983-09-03 1985-03-28 Sumitomo Special Metals Co Ltd 耐酸化性のすぐれた永久磁石
JPS60189901A (ja) * 1984-03-09 1985-09-27 Sumitomo Special Metals Co Ltd 希土類・ボロン・鉄系永久磁石用合金粉末の製造方法
EP0190461A2 (fr) * 1984-12-24 1986-08-13 Sumitomo Special Metals Co., Ltd. Procédé pour la fabrication d'aimants permanents et aimant permanent

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1914137B2 (de) * 1969-03-20 1976-09-23 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung von dauermagneten
DE2421605B2 (de) * 1974-05-04 1977-05-05 Verfahren zur herstellung von pulver fuer dauermagneten auf der basis von kobalt-seltenerden-verbindungen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59155106A (ja) * 1983-02-23 1984-09-04 Hitachi Maxell Ltd 金属磁性粉末の製造法
EP0125752A2 (fr) * 1983-05-09 1984-11-21 General Motors Corporation Aimants comportant des particules du système terre rare-fer et un liant
JPS6054406A (ja) * 1983-09-03 1985-03-28 Sumitomo Special Metals Co Ltd 耐酸化性のすぐれた永久磁石
JPS60189901A (ja) * 1984-03-09 1985-09-27 Sumitomo Special Metals Co Ltd 希土類・ボロン・鉄系永久磁石用合金粉末の製造方法
EP0190461A2 (fr) * 1984-12-24 1986-08-13 Sumitomo Special Metals Co., Ltd. Procédé pour la fabrication d'aimants permanents et aimant permanent

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 104, Nr. 24, Juni 1986, Seite 705, Zusammenfassung Nr. 217825y, Columbus, Ohio, US; A.S. KONONENKO et al.: "Effect of heat treatment on the coercive force of neodymium-iron-boron alloy magnets", & IZV. AKAD. NAUK SSSR, MET. 1986, (2), 182-4 *
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 32 (E-379)[2089], 7. Februar 1986; & JP-A-60 189 901 (SUMITOMO TOKUSHIYU KINZOKU K.K.) 27-09-1985 *
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 185 (E-332)[1908], 31. Juli 1985; & JP-A-60 54 406 (SUMITOMO TOKUSHIYU KINZOKU K.K.) 28-03-1985 *
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 4 (E-288)[1727], 10. Januar 1985; & JP-A-59 155 106 (HITACHI MAXELL K.K.) 04-09-1984 *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4959273A (en) * 1988-09-20 1990-09-25 Sumitomo Special Metals Co., Ltd. Corrosion-resistant permanent magnet and method for preparing the same
EP0361308A1 (fr) * 1988-09-20 1990-04-04 Sumitomo Special Metals Co., Ltd. Aimant permanent résistant à la corrosion et sa méthode de fabrication
EP0392077A2 (fr) * 1989-04-14 1990-10-17 Hitachi Metals, Ltd. Aimants magnétiquement anisotropes travaillés à chaud, et composition et méthode pour leur fabrication
EP0392077A3 (fr) * 1989-04-14 1991-06-26 Hitachi Metals, Ltd. Aimants magnétiquement anisotropes travaillés à chaud, et composition et méthode pour leur fabrication
US4990876A (en) * 1989-09-15 1991-02-05 Eastman Kodak Company Magnetic brush, inner core therefor, and method for making such core
US5464670A (en) * 1990-04-13 1995-11-07 Seiko Epson Corporation Resin bound magnet and its production process
EP0452580A1 (fr) * 1990-04-19 1991-10-23 Seiko Epson Corporation Aimant à liant résineux et son procédé de fabrication
EP0504397A1 (fr) * 1990-10-09 1992-09-23 Iowa State University Research Foundation, Inc. Procede de fabrication d'aimants permanents
EP0504397A4 (en) * 1990-10-09 1993-01-27 Iowa State University Research Foundation, Inc. Method of making permanent magnets
US6399146B1 (en) 1998-02-26 2002-06-04 The University Of Birmingham Method of applying a corrosion-resistant coating
WO1999043862A1 (fr) * 1998-02-26 1999-09-02 The University Of Birmingham Procede d'application d'un revetement resistant a la corrosion
GB2351741A (en) * 1998-02-26 2001-01-10 Univ Birmingham Method of applying a corrosion-resistant coating
EP1022929A2 (fr) * 1999-01-23 2000-07-26 Harman Audio Electronic Systems GmbH Haut-parleur avec un noyau magnétique d'habillage
EP1022929A3 (fr) * 1999-01-23 2007-06-13 Harman Becker Automotive Systems GmbH Haut-parleur avec un noyau magnétique d'habillage
EP1211700A2 (fr) * 2000-11-30 2002-06-05 Tokin Corporation Noyau magnétique comprenant un aimant de polarisation et inductance l'utilisant
EP1211700A3 (fr) * 2000-11-30 2003-10-15 NEC TOKIN Corporation Noyau magnétique comprenant un aimant de polarisation et inductance l'utilisant
KR100924037B1 (ko) * 2000-11-30 2009-10-27 엔이씨 도낀 가부시끼가이샤 자기 바이어스용 자석을 갖춘 자기 코어 및 이를 이용한인덕턴스 부품
DE102013004985A1 (de) 2012-11-14 2014-05-15 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Permanentmagneten sowie Permanentmagnet
WO2014075890A1 (fr) * 2012-11-14 2014-05-22 Volkswagen Aktiengesellschaft Procédé de production d'un aimant permanent, et aimant permanent correspondant
US10312019B2 (en) 2012-11-14 2019-06-04 Volkswagen Aktiengesellschaft Method for producing a permanent magnet and permanent magnet
DE102013213494A1 (de) 2013-07-10 2015-01-29 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Permanentmagneten sowie Permanentmagnet und elektrische Maschine mit einem solchen

Also Published As

Publication number Publication date
EP0255816A3 (fr) 1988-12-21
ATA209386A (de) 1988-02-15
JPS6338216A (ja) 1988-02-18
AT386554B (de) 1988-09-12

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