EP0088992A2 - Verfahren zur Herstellung eines Formkörpers aus weichmagnetischem Material durch Verbinden einer Pulvermasse - Google Patents

Verfahren zur Herstellung eines Formkörpers aus weichmagnetischem Material durch Verbinden einer Pulvermasse Download PDF

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Publication number
EP0088992A2
EP0088992A2 EP83102285A EP83102285A EP0088992A2 EP 0088992 A2 EP0088992 A2 EP 0088992A2 EP 83102285 A EP83102285 A EP 83102285A EP 83102285 A EP83102285 A EP 83102285A EP 0088992 A2 EP0088992 A2 EP 0088992A2
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EP
European Patent Office
Prior art keywords
grains
iron
oxide
aluminium
coating
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Withdrawn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
EP83102285A
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English (en)
French (fr)
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EP0088992A3 (de
Inventor
Hans Dr.Ing. Larker
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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
Application filed by ASEA AB filed Critical ASEA AB
Publication of EP0088992A2 publication Critical patent/EP0088992A2/de
Publication of EP0088992A3 publication Critical patent/EP0088992A3/de
Withdrawn legal-status Critical Current

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    • 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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/14—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 soft-magnetic materials metals or alloys
    • H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • 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
    • B22F1/16—Metallic particles coated with a non-metal
    • 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
    • B22F3/15—Hot isostatic pressing
    • 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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/33—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 soft-magnetic materials mixtures of metallic and non-metallic particles; metallic particles having oxide skin

Definitions

  • the invention relates to a method for manufacturing an object of soft-magnetic material by bonding together a mass of powder grains according to the introductory part of -claim 1.
  • Magnetic cores manufactured from powder are manufactured from powder the grains of which consist of a soft-magnetic material with a high saturation magnetization, such as pure iron or silicon-containing iron, for example iron containing 3 % silicon, by bonding together the powder grains by a resinous binder under the application of heat and pressure.
  • a soft-magnetic material with a high saturation magnetization such as pure iron or silicon-containing iron, for example iron containing 3 % silicon
  • powder cores for high frequency applications can be manufactured by providing powder grains of a soft-magnetic material with a coating of a ceramic binder and by then pressing the powder grains into an object which is subsequently subjected to a heat treatment.
  • the invention aims at developing a method of the above mentioned kind which allows to manufacture objects from powder of iron-based soft-magnetic material, which combine high magnetizability and high mechanical strength with low eddy current losses and low hysteresis losses.
  • a feasible explanation of the results obtained according to the invention may be the following:
  • the coating on the grains is well anchored to said powder grain material, which contributes to a good mechanical strength of the finished object. Because the coating is at least relatively resistent to deformations at higher temperatures but still has a certain flexibility in thin layers so that it can be adapted to changes of the shape of the grains of the iron-bases material during pressing, and because the pressing is carried out as an isostatic pressing, the coating can be brought to form, in the finished object, thin layers of uniform thickness thus giving the object a compact structure.
  • the electrically insulating character of the layers results in both low eddy current losses and good magnetizability of the finished object. Further, owing to the fact that the pressing can be carried out at relatively high temperatures, internal stresses which may occur in the grain material may be removed, which results in low hysteresis losses of the finished object. If, however, the temperature during the pressing becomes too high, such as above 900°C, no reduction is obtained, in any case no considerable reduction, of the eddy current losses compared with those of solid iron-based material of the same kind, which is probably due to metallic contacts then easily arising between the grains.
  • the grains of the iron-based material may consist of at least approximately pure iron, preferably containing at least 99.95% Fe.
  • % relates to percentage by weight.
  • the grains may also consist of iron containing silicon, aluminium, and/or titanium.
  • the content of silicon may suitably amount to 0.01-8 %, the content of aluminium to 0.001 - 2% and the content of titanium to 0.001 - 1%. Regardless of the type of iron- based material, the carbon content should be below 0.005%.
  • At least the main part of the grains of the iron-based material suitably has a size of 50-1000 ⁇ m and the coating suitably a thickness of 0.01 - 0.5 pm.
  • the layers formed by the coatings between two adjacent grains have, on'an average, a thickness of 0.02 - 1 ⁇ m.
  • the ratio between the average . thickness of said layers and the average grain .size of the iron-based material is preferably between the limits 10 -4 to 10 -2 .
  • the iron oxide on the grains can advantageously be accomplished by oxidation of the powder grains in a fluidized bed reactor with water vapour or air at a temperature of around 400°C. If the iron-based material consists of pure iron, at least an oxide of silicon, aluminium or titanium is supplied to the surface of the oxidized grains to form the coating. This can be performed from a colloidal solution of the oxide in question with water. The oxide can also be supplied otherwise.
  • the silicon oxide for example, may be supplied by coating the oxidized grains with a hydrolyzable organic silicon compound, such as tetraethyl silicate, which is then hydrolyzed while forming a silicon dioxide.
  • the amount of supplied oxide shall be sufficient to form - with the iron oxide during a subsequent heat treatment, suitably at a temperature of above 800°C in inert atmosphere, either in connection with the isostatic pressing or in a separate stage prior thereto - a silicate, aluminate and/or a titanate, which is active as a binder in the pressed object.
  • the iron-based material consists of iron containing silicon, aluminium or iron, the described method of supplying oxides of silicon, aluminium and/or titanium from outside can be employed.
  • the silicon, aluminium and/or titanium included in the iron-based material can be utilized to form the silicate, aluminate and/or titanate with the iron oxide formed during the previously mentioned oxidation of the grains.
  • the formation of silicate, aluminate and/or titanate takes place at elevated temperature, suitably at above 800°C, and suitably in an atmosphere of moist hydrogen gas.
  • silicon, aluminium and/or titanium in the iron- based material reacts with the iron oxide present at the surface of the grains to form silicon dioxide, aluminium trioxide and/or titanium dioxide, whereby the iron oxide is reduced to iron.
  • the primarily formed oxide of the kind mentioned'further reacts with iron oxide remaining at the surface of the grains thereby forming silicate, aluminate and/or titanate. This can take place either in a separate, stage prior to the isostatic pressing or in conjunction with the isostatic pressing. . If the content of silicon, aluminium and/or titanium in the ironbased material is sufficient to form a sufficient amount of silicate, aluminate and/or titanate, no oxide of these substances need be supplied from outside. If the content is insufficient, a supplementary amount of oxide may be subsequently supplied, such as described in connection with the supply of such oxide to oxidized grains of pure iron, where this supply is necessary.
  • the isostatic pressing is suitably carried out at a temperature of 600-900°C, preferably at a temperature of 600-775°C, and suitably at a pressure of 10 - 200 MPa, preferably at a pressure of at least 50 MPa.
  • the figure shows the structure of part of an object built .up of grains 1 of an iron-based soft-magnetic material, which are bonded to each other by means of a binder 2 formed of coatings on the individual grains. Examples of such coatings are described in the following:
  • Substantially spherical. grains of approximately pure iron containing 99,99% Fe and less than 0.005% C and having a size of 45-200 ⁇ m are oxidized at a temperature of 400°C in water vapour so that the grains receive a coating of iron oxide having a thickness of about 0.01 ⁇ m, which takes less than 1 minute.
  • the oxidized grains are dipped into a colloidal solution of silicon dioxide in water and are then dried, thus receiving a coating of silicon dioxide having a thickness of 0.04 ⁇ m.
  • the grains are then placed in a capsule of steel sheet having low carbon content and having the same shape as, but larger dimensions than, the object which is to be manufactured. The capsule with its contents is evacuated and sealed.
  • silicon dioxide instead of silicon dioxide there may be used aluminium oxide or titanium dioxide (preferably in the form of anatase) or a mixture of at least two of these oxides to obtain the described coating on the grain covered with iron oxide.
  • Substantially spherical grains of silicon steel containing 3 % Si and less than 0.005 % C and having a grain size of 150-350 ⁇ m are oxidized in water vapour at a temperature of around 400°C so that the grains receive a coating of iron oxide having a thickness of about 0.1 pm.
  • the oxidized grains are then treated at a temperature of around 825 0 C in moist nitrogen gas for a few minutes so that a silicate, formed in a manner previously described, is obtained at the surface of the grains.
  • the grains are thereafter placed in a capsule of steel sheet with a low carbon content and having the same shape as, but larger dimensions than, the object to be manufactured.
  • the capsule with its contents is subjected to the same treatment as the filled capsule described under Example 1.
  • the object obtained during the isostatic pressing forms a coherent body with the silicate as a binder between the grains. It has a density exceeding 99 % of the theorectical density and a good mechanical strength.
  • a steel containing 3 % Si there may be used a steel containing 0.2 % aluminium a steel containing 0.01 % Ti or a steel containing at least two of said substances in said contents.
  • the manufactured object may, among other things, be used as a magnetic core, preferably as a stator, for an electrical machine or as a magnetic core for a magnetically operated contactor. It may also constitute part of a magnetic core, for example for a stator for an electrical machine.
  • a magnetic core for a large stator can then be manufactured in a number of parts which are arranged adjacent to each other in order to form the magnetic core.
EP83102285A 1982-03-17 1983-03-09 Verfahren zur Herstellung eines Formkörpers aus weichmagnetischem Material durch Verbinden einer Pulvermasse Withdrawn EP0088992A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8201678A SE8201678L (sv) 1982-03-17 1982-03-17 Sett att framstella foremal av mjukmagnetiskt material
SE8201678 1982-03-17

Publications (2)

Publication Number Publication Date
EP0088992A2 true EP0088992A2 (de) 1983-09-21
EP0088992A3 EP0088992A3 (de) 1984-12-19

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EP83102285A Withdrawn EP0088992A3 (de) 1982-03-17 1983-03-09 Verfahren zur Herstellung eines Formkörpers aus weichmagnetischem Material durch Verbinden einer Pulvermasse

Country Status (3)

Country Link
EP (1) EP0088992A3 (de)
JP (1) JPS58171501A (de)
SE (1) SE8201678L (de)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145178A1 (de) * 1983-11-16 1985-06-19 Kabushiki Kaisha Toshiba Magnetpulverkomposition
EP0182010A1 (de) * 1984-11-20 1986-05-28 Kabushiki Kaisha Toshiba Ablenkjoch für Kathodenstrahlröhren mit elektromagnetischer Ablenkung und Verfahren zur Herstellung desselben
US4696725A (en) * 1985-06-26 1987-09-29 Kabushiki Kaisha Toshiba Magnetic core and preparation thereof
EP0378160A2 (de) * 1989-01-10 1990-07-18 Matsushita Electric Industrial Co., Ltd. Magnetkopf und Herstellungsverfahren
EP0383035A2 (de) * 1989-01-18 1990-08-22 Nippon Steel Corporation Magnetkerne aus Eisen-Silizium-Legierungspulver und Herstellungsverfahren
EP0399529A1 (de) * 1989-05-24 1990-11-28 Kabushiki Kaisha Toshiba Verfahren zur Herstellung eines Halbleiterbauelementes und so hergestelltes Halbleiterbauelement
EP0401836A1 (de) * 1989-06-09 1990-12-12 Matsushita Electric Industrial Co., Ltd. Substrat aus Verbundwerkstoff
EP0406580A1 (de) * 1989-06-09 1991-01-09 Matsushita Electric Industrial Co., Ltd. Verbundmaterial sowie Verfahren zu seiner Herstellung
US5227235A (en) * 1990-05-09 1993-07-13 Tdk Corporation Composite soft magnetic material and coated particles therefor
US5348800A (en) * 1991-08-19 1994-09-20 Tdk Corporation Composite soft magnetic material
US5350628A (en) * 1989-06-09 1994-09-27 Matsushita Electric Industrial Company, Inc. Magnetic sintered composite material
EP0834370A1 (de) * 1996-09-25 1998-04-08 Shoei Chemical Inc. Beschichtetes Metallpulver und Verfahren seiner Herstellung durch Zersetzung
EP0869517A1 (de) * 1997-03-31 1998-10-07 TDK Corporation Pulverkern, ferromagnetisches Pulverzusammenstellung dafür, und Herstellungsverfahren
WO1999050949A1 (en) * 1998-03-30 1999-10-07 Höganäs Ab Electrical machine element
US6060165A (en) * 1997-06-02 2000-05-09 Shoei Chemical Inc. Metal powder and process for preparing the same
WO2001022439A1 (de) * 1999-09-23 2001-03-29 Robert Bosch Gmbh Weichmagnetischer werkstoff und verfahren zu dessen herstellung
DE19960095A1 (de) * 1999-12-14 2001-07-05 Bosch Gmbh Robert Gesinterter weichmagnetischer Verbundwerkstoff und Verfahren zu dessen Herstellung
DE10031923A1 (de) * 2000-06-30 2002-01-17 Bosch Gmbh Robert Weichmagnetischer Werkstoff mit heterogenem Gefügebau und Verfahren zu dessen Herstellung
WO2004070745A1 (en) * 2003-02-05 2004-08-19 Corporation Imfine Canada Inc. High performance magnetic composite for ac applications and a process for manufacturing the same
EP1782779A1 (de) * 2004-07-14 2007-05-09 Mycoal Products Corporation Aktives eisenpulver, exothermische zusammensetzung und exothermischer artikel
CN109119222A (zh) * 2017-06-26 2019-01-01 太阳诱电株式会社 磁性材料、电子部件和磁性材料的制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669648A (en) * 1927-01-03 1928-05-15 Western Electric Co Magnetic material
US2068658A (en) * 1934-06-20 1937-01-26 Associated Electric Lab Inc Inductance coil core
US2531445A (en) * 1945-11-23 1950-11-28 Int Standard Electric Corp Manufacture of magnetic bodies from compressed powdered materials
US3814598A (en) * 1970-12-29 1974-06-04 Chromalloy American Corp Wear resistant powder metal magnetic pole piece made from oxide coated fe-al-si powders
FR2391018A1 (fr) * 1977-05-16 1978-12-15 Carpenter Technology Corp Produit metallurgique fragile realise par frittage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669648A (en) * 1927-01-03 1928-05-15 Western Electric Co Magnetic material
US2068658A (en) * 1934-06-20 1937-01-26 Associated Electric Lab Inc Inductance coil core
US2531445A (en) * 1945-11-23 1950-11-28 Int Standard Electric Corp Manufacture of magnetic bodies from compressed powdered materials
US3814598A (en) * 1970-12-29 1974-06-04 Chromalloy American Corp Wear resistant powder metal magnetic pole piece made from oxide coated fe-al-si powders
FR2391018A1 (fr) * 1977-05-16 1978-12-15 Carpenter Technology Corp Produit metallurgique fragile realise par frittage

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4820338A (en) * 1983-11-16 1989-04-11 Kabushiki Kaisha Toshiba Magnetic powder composition
EP0145178A1 (de) * 1983-11-16 1985-06-19 Kabushiki Kaisha Toshiba Magnetpulverkomposition
EP0182010A1 (de) * 1984-11-20 1986-05-28 Kabushiki Kaisha Toshiba Ablenkjoch für Kathodenstrahlröhren mit elektromagnetischer Ablenkung und Verfahren zur Herstellung desselben
US4620933A (en) * 1984-11-20 1986-11-04 Kabushiki Kaisha Toshiba Deflecting yoke for electromagnetic deflection type cathode-ray tubes and method for manufacturing it
US4696725A (en) * 1985-06-26 1987-09-29 Kabushiki Kaisha Toshiba Magnetic core and preparation thereof
EP0378160A2 (de) * 1989-01-10 1990-07-18 Matsushita Electric Industrial Co., Ltd. Magnetkopf und Herstellungsverfahren
EP0378160A3 (en) * 1989-01-10 1990-12-27 Matsushita Electric Industrial Co., Ltd. Magnetic head and method of producing the same
EP0383035A3 (de) * 1989-01-18 1991-07-03 Nippon Steel Corporation Magnetkerne aus Eisen-Silizium-Legierungspulver und Herstellungsverfahren
EP0383035A2 (de) * 1989-01-18 1990-08-22 Nippon Steel Corporation Magnetkerne aus Eisen-Silizium-Legierungspulver und Herstellungsverfahren
EP0399529A1 (de) * 1989-05-24 1990-11-28 Kabushiki Kaisha Toshiba Verfahren zur Herstellung eines Halbleiterbauelementes und so hergestelltes Halbleiterbauelement
EP0401835B1 (de) * 1989-06-09 1997-08-13 Matsushita Electric Industrial Co., Ltd. Magnetisches Material
EP0406580A1 (de) * 1989-06-09 1991-01-09 Matsushita Electric Industrial Co., Ltd. Verbundmaterial sowie Verfahren zu seiner Herstellung
US5164264A (en) * 1989-06-09 1992-11-17 Matsushita Electric Industrial Co., Ltd. Composite substrate
US5183631A (en) * 1989-06-09 1993-02-02 Matsushita Electric Industrial Co., Ltd. Composite material and a method for producing the same
US5350628A (en) * 1989-06-09 1994-09-27 Matsushita Electric Industrial Company, Inc. Magnetic sintered composite material
US5352522A (en) * 1989-06-09 1994-10-04 Matsushita Electric Industrial Co., Ltd. Composite material comprising metallic alloy grains coated with a dielectric substance
EP0401836A1 (de) * 1989-06-09 1990-12-12 Matsushita Electric Industrial Co., Ltd. Substrat aus Verbundwerkstoff
US5227235A (en) * 1990-05-09 1993-07-13 Tdk Corporation Composite soft magnetic material and coated particles therefor
US5348800A (en) * 1991-08-19 1994-09-20 Tdk Corporation Composite soft magnetic material
EP0834370A1 (de) * 1996-09-25 1998-04-08 Shoei Chemical Inc. Beschichtetes Metallpulver und Verfahren seiner Herstellung durch Zersetzung
US6102980A (en) * 1997-03-31 2000-08-15 Tdk Corporation Dust core, ferromagnetic powder composition therefor, and method of making
EP0869517A1 (de) * 1997-03-31 1998-10-07 TDK Corporation Pulverkern, ferromagnetisches Pulverzusammenstellung dafür, und Herstellungsverfahren
CN100406166C (zh) * 1997-06-02 2008-07-30 昭荣化学工业株式会社 金属粉末及其制备方法
US6060165A (en) * 1997-06-02 2000-05-09 Shoei Chemical Inc. Metal powder and process for preparing the same
US6300702B1 (en) 1998-03-30 2001-10-09 Höganäs Ab Electrical machine element
WO1999050949A1 (en) * 1998-03-30 1999-10-07 Höganäs Ab Electrical machine element
WO2001022439A1 (de) * 1999-09-23 2001-03-29 Robert Bosch Gmbh Weichmagnetischer werkstoff und verfahren zu dessen herstellung
US6620376B1 (en) 1999-09-23 2003-09-16 Robert Bosch Gmbh Soft magnetic material and method for manufacturing it
DE19960095A1 (de) * 1999-12-14 2001-07-05 Bosch Gmbh Robert Gesinterter weichmagnetischer Verbundwerkstoff und Verfahren zu dessen Herstellung
DE10031923A1 (de) * 2000-06-30 2002-01-17 Bosch Gmbh Robert Weichmagnetischer Werkstoff mit heterogenem Gefügebau und Verfahren zu dessen Herstellung
WO2004070745A1 (en) * 2003-02-05 2004-08-19 Corporation Imfine Canada Inc. High performance magnetic composite for ac applications and a process for manufacturing the same
US7510766B2 (en) 2003-02-05 2009-03-31 Corporation Imfine Inc. High performance magnetic composite for AC applications and a process for manufacturing the same
EP1782779A1 (de) * 2004-07-14 2007-05-09 Mycoal Products Corporation Aktives eisenpulver, exothermische zusammensetzung und exothermischer artikel
EP1782779A4 (de) * 2004-07-14 2011-03-23 Mycoal Prod Corp Aktives eisenpulver, exothermische zusammensetzung und exothermischer artikel
CN109119222A (zh) * 2017-06-26 2019-01-01 太阳诱电株式会社 磁性材料、电子部件和磁性材料的制造方法
CN109119222B (zh) * 2017-06-26 2021-12-31 太阳诱电株式会社 磁性材料、电子部件和磁性材料的制造方法

Also Published As

Publication number Publication date
JPS58171501A (ja) 1983-10-08
EP0088992A3 (de) 1984-12-19
SE8201678L (sv) 1983-09-18

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