EP1125307A1 - Materiau composite pulverulent magnetique doux moule par injection et procede permettant de le preparer - Google Patents

Materiau composite pulverulent magnetique doux moule par injection et procede permettant de le preparer

Info

Publication number
EP1125307A1
EP1125307A1 EP99960838A EP99960838A EP1125307A1 EP 1125307 A1 EP1125307 A1 EP 1125307A1 EP 99960838 A EP99960838 A EP 99960838A EP 99960838 A EP99960838 A EP 99960838A EP 1125307 A1 EP1125307 A1 EP 1125307A1
Authority
EP
European Patent Office
Prior art keywords
alloy
composite material
soft magnetic
powder composite
magnetic powder
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Withdrawn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
EP99960838A
Other languages
German (de)
English (en)
Inventor
Markus Brunner
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP1125307A1 publication Critical patent/EP1125307A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01F1/12—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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15358—Making agglomerates therefrom, e.g. by pressing
    • H01F1/15366—Making agglomerates therefrom, e.g. by pressing using a binder
    • H01F1/15375—Making agglomerates therefrom, e.g. by pressing using a binder using polymers
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing

Definitions

  • the invention relates to an injection molded, soft magnetic powder composite.
  • soft magnetic powder composite materials as pressed magnetic cores have been known for a long time and are used in particular in inductive components.
  • pressed powder composites made of iron powder are known.
  • the permeability range from approx. 10 to 300 can be covered well with these magnetic cores.
  • the saturation induction achievable with these cores is approx. 1.6 T.
  • the application frequencies are typically below 50 kHz due to the comparatively low specific resistance and the particle size of the iron particles.
  • Pressed powder composite cores made of soft magnetic crystalline iron-aluminum-silicon alloys are also known. With both powder composites, permeabilities between 20 and 120 can be achieved with saturation induction of around 1 T. Due to the comparatively high specific resistance, the application frequencies range well above 100 kHz.
  • the powder composites which are based on crystalline nickel-iron alloys, occupy a leading position in terms of saturation induction and permeability.
  • a permeability in the range of approx. 500 or a saturation induction up to close to 1.5 T can be achieved via the nickel content.
  • the comparatively low remagnetization losses allow use at frequencies above 100 kHz.
  • all known powder composite materials have the disadvantage that only geometrically very simple designs can be realized with the pressing technologies used for the production.
  • iron powder composite materials these are essentially ring or shell cores. Only ring cores are produced with the other powder composites mentioned above.
  • a heat treatment is generally required after the shaping.
  • this object is achieved by an injection-molded, soft magnetic powder composite material, which is characterized in that the powder composite material consists of at least one alloy powder made of a nanocrystalline, ferromagnetic alloy which is embedded in an injection-moldable plastic, and that the alloy powder has a concentration between 10 and 70 vol% is embedded in the plastic.
  • Such nanocrystalline alloys are known, for example, from EP 0 271 657 A2 and from EP 0 455 113 A2.
  • these alloys are produced in the form of a thin strip using the melt spinning technology described there is subjected to a heat treatment in order to achieve the nanocrystalline structure.
  • the magnetic properties of the cast tape are adjusted via a heat treatment in a magnetic field.
  • the nanocrystalline tapes are very brittle by nature, so that the tapes can be crushed very easily into small flakes without great effort, without significant damage to the soft magnetic properties being observed.
  • the comminution of the nanocrystalline alloy strips thus gives an alloy powder consisting of flakes in the original strip thickness, which is typically between 10 ⁇ m and 30 ⁇ m, and a lateral dimension, which is preferably in the range from 0.05 to 2 mm. Smaller lateral dimensions negatively affect permeability. If the alloy powder is further crushed, the resulting high grinding energies will result in structural damage and a significant increase in the coercive force of the powder.
  • the alloy powder is gently comminuted, in particular gently broken, coercive field strengths can be achieved which are only slightly above those of the nanocrystalline starting material and are therefore to be regarded as unique in the field of powder composite cores.
  • a sufficient further requirement for use at high operating frequencies is, on the one hand, the highest possible specific resistance of the alloy itself and, on the other hand, good particle insulation of the individual flakes to suppress volume eddy currents. Due to the high metalloid content of nanocrystalline alloys, it is naturally present high specific resistance, so that use at high operating frequencies is easily possible.
  • the flakes are typically subjected to a surface coating.
  • Surface oxidation of the flakes has been found to be particularly suitable for the surface coating, and also a coating with silicon oxide-containing polymers, so-called silanes, or silanols produced therefrom. Excellent results are achieved in particular by a combination of surface oxidation of the flakes and a subsequent coating with a silane.
  • the alloy powder treated in this way is then injection molded.
  • the plastic required for injection molding is kneaded with the treated alloy powder and the resulting mixture is then injection molded with the usual injection molding machines.
  • the plastic not only serves temporarily as a binder, which is usually removed again after the injection molding process by a sintering process in order to further compress the compact, but rather as an electrical insulator.
  • the plastic remains in the molded part after injection molding and takes on the function of a binder.
  • the selection of the plastic to be used depends on the one hand on the requirements of the injection molding process and on the other hand on the properties of the molded part to be obtained.
  • polyamides and so-called liquid-crystalline plastics have distinguished themselves for use.
  • thermoplastics such as B.
  • Polyphenylene sulfide can be considered.
  • Injection-molded soft magnetic magnetic cores were produced using a nanocrystalline alloy Fe73 5Cu; j_ b3Si; L5 5B7 and a polyamide as a binder, which had a saturation induction of approximately 0.7 T, permeabilities ⁇ between 10-100 and magnetization losses of approximately 60 W / kg at a frequency of 100 kHz and an induction of 0.1 T.
  • a nanocrystalline tape with the above-mentioned composition was cast using the known melt spinning technology and then subjected to a heat treatment under a water-substance atmosphere to adjust the nanocrystalline structure.
  • the heat-treated alloy strip was then ground into flakes that had a thickness of approximately 20 ⁇ m and a lateral particle size of approximately 1.5 mm.
  • the flakes thus produced were oxidized at a temperature between 400 ° C and 540 ° C for a period of two hours.
  • the flakes were coated with a silane, the resulting silane coating was baked at a temperature between 80 and 200 ° C. for a period of about 1 hour.
  • silane coating other layer-forming organic coating systems can also be used. The only requirement is that the resin has sufficient thermal stability at the temperatures required for injection molding.
  • silanes used are compatible with the plastics required for injection molding.
  • plastics required for injection molding.
  • aminosilanes should be used
  • polyphenylene sulfide for example, a glycidylsilane should be used.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un matériau composite pulvérulent magnétique doux moulé par injection, comprenant au moins un alliage pulvérulent d'alliage ferromagnétique nanocristallin. Cet alliage est incorporé dans une matière plastique moulable par injection, de manière que l'alliage pulvérulent soit réparti dans la matière plastique dans une concentration comprise entre 10 et 70 % en volume.
EP99960838A 1998-10-28 1999-10-28 Materiau composite pulverulent magnetique doux moule par injection et procede permettant de le preparer Withdrawn EP1125307A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19849781 1998-10-28
DE19849781A DE19849781A1 (de) 1998-10-28 1998-10-28 Spritzgegossener weichmagnetischer Pulververbundwerkstoff und Verfahren zu seiner Herstellung
PCT/DE1999/003444 WO2000025326A1 (fr) 1998-10-28 1999-10-28 Materiau composite pulverulent magnetique doux moule par injection et procede permettant de le preparer

Publications (1)

Publication Number Publication Date
EP1125307A1 true EP1125307A1 (fr) 2001-08-22

Family

ID=7885981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99960838A Withdrawn EP1125307A1 (fr) 1998-10-28 1999-10-28 Materiau composite pulverulent magnetique doux moule par injection et procede permettant de le preparer

Country Status (4)

Country Link
EP (1) EP1125307A1 (fr)
JP (1) JP2002528910A (fr)
DE (1) DE19849781A1 (fr)
WO (1) WO2000025326A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10024824A1 (de) * 2000-05-19 2001-11-29 Vacuumschmelze Gmbh Induktives Bauelement und Verfahren zu seiner Herstellung
EP1715559A1 (fr) * 2005-04-22 2006-10-25 Isa Innovations S.A. Pièce de moteur électrique comportant des encoches
CN100424505C (zh) * 2005-12-21 2008-10-08 宋京伟 塑料制品裂纹的涡流探伤方法
DE102006028389A1 (de) * 2006-06-19 2007-12-27 Vacuumschmelze Gmbh & Co. Kg Magnetkern und Verfahren zu seiner Herstellung
US9057115B2 (en) 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it
DE102010017901A1 (de) * 2010-04-21 2011-10-27 Abb Ag Elektromagnetischer Auslöser
DE102015105431A1 (de) * 2015-04-09 2016-10-13 Volkswagen Ag Verfahren zur Herstellung eines weichmagnetischen Körpers
CN106098297B (zh) * 2016-07-30 2017-12-26 青岛菲尔泰科电子有限公司 一种用于电感器的电感组件的制造方法
JP6761742B2 (ja) 2016-11-24 2020-09-30 山陽特殊製鋼株式会社 高周波で用いる磁性粉末およびこれを含有する磁性樹脂組成物
DE102021109597A1 (de) 2021-04-16 2022-10-20 Magnetec Gmbh Magnetfeldempfindliches Bauelement, Herstellverfahren und Verwendung

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US4197146A (en) * 1978-10-24 1980-04-08 General Electric Company Molded amorphous metal electrical magnetic components
US4385944A (en) * 1980-05-29 1983-05-31 Allied Corporation Magnetic implements from glassy alloys
JPS57176704A (en) * 1981-04-23 1982-10-30 Fujitsu Ltd Manufacture of core
JPS59129405A (ja) * 1983-01-14 1984-07-25 Kijima Musen Kk 巻線部品の鉄心
DE3668722D1 (de) * 1985-06-26 1990-03-08 Toshiba Kawasaki Kk Magnetkern und herstellungsverfahren.
JPS62226603A (ja) * 1986-03-28 1987-10-05 Hitachi Metals Ltd アモルフアス圧粉磁心およびその製造方法
EP0301561B1 (fr) * 1987-07-31 1992-12-09 TDK Corporation Poudre magnétique de fer doux pour former un écran magnétique, composition et procédé pour faire celle-ci
US4876305A (en) * 1987-12-14 1989-10-24 The B. F. Goodrich Company Oxidation resistant compositions for use with rare earth magnets
DE69015881T2 (de) * 1989-05-27 1995-09-14 Tdk Corp Weichmagnetische Legierung, Herstellungsverfahren, Magnetkern, magnetischer Schirm und gepresster Magnetkern damit.
GB9211145D0 (en) * 1992-05-26 1992-07-08 Abbott A D Polymer bonded soft magnetic materials
EP0574856B1 (fr) * 1992-06-15 1996-12-11 Kureha Kagaku Kogyo Kabushiki Kaisha Composition résineuse magnétique et article moulé de cela
JPH07153628A (ja) * 1993-11-26 1995-06-16 Hitachi Metals Ltd アクティブフィルタ用チョークコイルおよびアクティブフィルタ回路ならびにこれを用いた電源装置
DE19608891A1 (de) * 1996-03-07 1997-09-11 Vacuumschmelze Gmbh Ringkerndrossel zur Funkentstörung von Halbleiterschaltungen nach dem Phasenanschnittverfahren
US6102980A (en) * 1997-03-31 2000-08-15 Tdk Corporation Dust core, ferromagnetic powder composition therefor, and method of making

Non-Patent Citations (1)

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Title
See references of WO0025326A1 *

Also Published As

Publication number Publication date
JP2002528910A (ja) 2002-09-03
WO2000025326A1 (fr) 2000-05-04
DE19849781A1 (de) 2000-05-11

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