EP1053552A1 - Film magnetique et son procede de fabrication - Google Patents

Film magnetique et son procede de fabrication

Info

Publication number
EP1053552A1
EP1053552A1 EP99907508A EP99907508A EP1053552A1 EP 1053552 A1 EP1053552 A1 EP 1053552A1 EP 99907508 A EP99907508 A EP 99907508A EP 99907508 A EP99907508 A EP 99907508A EP 1053552 A1 EP1053552 A1 EP 1053552A1
Authority
EP
European Patent Office
Prior art keywords
film
hard magnetic
magnetic powder
magnetic
dispersion
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
EP99907508A
Other languages
German (de)
English (en)
Other versions
EP1053552B1 (fr
Inventor
Sergej Antochin
Wilhelm Fernengel
Matthias Katter
Werner Rodewald
Boris Wall
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
Lofo High Tech Film GmbH
Original Assignee
Vacuumschmelze GmbH and Co KG
Lofo High Tech Film GmbH
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, Lofo High Tech Film GmbH filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP1053552A1 publication Critical patent/EP1053552A1/fr
Application granted granted Critical
Publication of EP1053552B1 publication Critical patent/EP1053552B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H01F41/14—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 applying magnetic films to substrates
    • H01F41/16—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 applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
    • 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
    • H01F1/0027—Thick magnetic films

Definitions

  • the invention relates to a hard magnetic film based on polymer, in particular for use in electric motors or for sensor applications, and to a method for the production thereof.
  • the object of the present invention was therefore to provide a flexible, hard magnetic material of small thickness and an economical process for its production.
  • this object is achieved by the film according to claim 1 and the manufacturing method according to claim 9.
  • carrier-free means here that the finished foils do not - like, for example, the foils known as magnetic tapes or "floppy disks" - consist of a non-magnetic carrier and a magnetizable one or both sides. 2-sided coating are built up, but consist of a single continuous magnetic or magnetizable layer.
  • the hard magnetic powder expediently has an average particle size of less than 100 ⁇ m, preferably one of less than 20 ⁇ m.
  • the films according to the invention advantageously have a thickness of 50 to 2000 ⁇ m, preferably that of 100 to 500 ⁇ m.
  • the volume fraction of the hard magnetic powder in the magnetic film according to the invention can be adjusted as required. It is preferably at least 50%, particularly preferably at least 60%. It is possible to keep the polymer content so low that the polymer practically only fills the gaps in an approximately tight packing of the powder particles.
  • the foils according to the invention preferably contain one or more rare earth alloy (s) as hard magnetic powder.
  • rare earth alloy s
  • other hard magnetic materials such as Al-Ni-Co or Cr-Fe-Co alloys or ferrites.
  • Rare earth alloys which can be described by the general formulas SECo 5 , (SE) 2 (Co, Fe, Cu, Zr) 17 or (SE) 2 Fe 14 B are particularly preferred.
  • SE means an element from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium or a mixture of several of these elements.
  • the compositions Sm 2 (Co, Fe, Cu, Zr) 17 and (Pr, Nd, Dy) Fe 14 B are very particularly preferred. Alloys of these types are, for example, under the brands VACOMAX ® and VACODYM ® from Vacuumschmelze GmbH or available under the MAGNEQUENCH ® brand from Magnequench Inc.
  • the polymer matrix can basically consist of any polymer that is soluble or dispersible in volatile solvents. However, it is also possible to use polymers which are suitably made in thin form from low-viscosity monomers or oligomers 3
  • Soluble thermoplastic materials are preferably used, in particular soluble polyvinylidene fluoride.
  • non-thermoplastic materials such as, for example, one-component polyurethane dispersions.
  • the hard magnetic powder particles can be randomly arranged (isotropically) or, if they have an inherent anisotropy, optionally aligned. They are preferably aligned parallel or perpendicular to the film surface.
  • the magnetic remanence of the magnetic foils according to the invention is determined by the type and packing density of the hard magnetic powder particles and is preferably 0.2 to 0.8 Tesla.
  • the magnetic foils according to the invention can be produced, for example, by (i) dispersing a powder of a hard magnetic material in a solution or dispersion of a polymer material in a volatile solvent, (ii) pouring the dispersion thus obtained as a film of defined thickness onto a rotating casting belt, ( iii) the solvent evaporates and (iv) the film thus formed is pulled off the casting belt.
  • the magnetization of the film can take place after the evaporation of the solvent or at a later point in time (e.g. after assembly), an isotropic magnetic film being obtained because of the incorporation of the magnetic particles in the polymer matrix.
  • Orientation prior to solidification of the cast film is particularly preferred. Particles made of an anisotropic material can align themselves in the external magnetic field, so that an anisotropic magnetic film is obtained. 4
  • the magnetization and optionally alignment can preferably be carried out by means of a pulsed magnetic field.
  • a pulsed magnetic field As a result, high field strengths can be achieved with low energy consumption using electromagnets.
  • Hard magnetic powder particles that are particularly easy to orientate can also be oriented in the air gap of a suitable permanent magnet yoke.
  • a rare earth alloy is preferably used as the hard magnetic powder.
  • Soluble polyvinylidene fluoride (copolymer) is preferably used as the polymer material.
  • a preferred volatile solvent for soluble polyvinylidene fluoride (copolymer) is acetone.
  • the continuous casting belt is preferably made of matt stainless steel.
  • the actual pouring device comprises a temperature-controllable storage container 1 with a stirring device for the pouring solution or dispersion, a controllable feed pump 2, a filter device 3 for separating agglomerates and the pourer 4.
  • the pouring solution or dispersion is poured onto an endless pouring belt 5, which revolves over rollers 6, 7 and is heated indirectly by heating elements 8.
  • the casting belt is driven via one of the rollers, which is provided with a speed-controlled drive 16.
  • the magnetic film can optionally be subjected to post-drying in a drying section 12 before being wound up on a winding mandrel 13, the film advantageously from a carrier web 14 is supported.
  • the carrier web can optionally also serve as a separating film and can be applied together with the magnetic film. 5 can be wrapped (not shown).
  • an electromagnet or permanent magnet yoke 17 is advantageously mounted at a short distance above the casting belt.
  • the entire pouring and drying device is advantageously surrounded by a housing 15, which reduces heat losses and, in combination with a suction and filter device, prevents the load on the production rooms from solvent vapors.
  • Gear pumps or peristaltic pumps, for example, can be used as feed pumps 2.
  • the pourer 4 can be designed both as a die-casting machine, in which the casting solution is supplied directly to the casting gap by the feed pump 2 with increased pressure, and also as an open stripper, which works solely with hydrostatic pressure. In both cases, the pressure or the fill level is advantageously kept constant by appropriate control of the pump output.
  • the film thickness is essentially determined by the width of the casting gap between the caster 4 and the casting belt 5.
  • the heating devices 8 preferably supply the heat as radiant heat. Warm air is advantageously supplied to support the drying process and to remove the solvent vapors. It is also possible to transfer the heat to the casting belt, for example via heated rollers, or to heat it by direct current passage or inductively. Finally, the cast film can also be heated by microwave energy.
  • the casting device can be provided with one or more cooling devices 9. These can be designed, for example, as coolable drums or rollers, over which the casting belt 5 is guided, so that the cooling takes place indirectly.
  • devices for direct cooling of the film are also possible, for example in the form of suitably arranged nozzles for inflating cold air or other cooling media. A combination of both measures is of course also possible.
  • the removal device 10 is expediently designed such that no excessive pull is exerted on the film, which could lead to undesired stretching or even tearing of the film.
  • the removal device advantageously consists of a roller or 6 a pair of rollers which exerts a controlled tensile stress on the film and is preferably arranged in such a way that a take-off angle of 15 ° to 45 ° results.
  • a cutting and stacking device can alternatively be provided in order to deposit the film as a stack of sheets.
  • the total solids content of the casting solution thus obtained was 78.3% by mass, the volume fraction of the magnetic powder after drying was approx. 63%>.
  • a film with a thickness of 120-140 ⁇ m was produced using the casting device described above.
  • the film thus obtained had a density of 2.9-3.3 g / cm 3 .
  • films with a thickness of 220-230 ⁇ m and a thickness of 230-235 ⁇ m with densities of 3.6-3.7 g / cm 3 and 4.0-4.1 g / cm 3 were also obtained - poses.
  • the foils had a remanence of 0.2-0.29 T with a coercive field strength of
  • the procedure was as described in Example 1, but an NdFeB magnet powder was used instead of the Sm 2 (Co, Cu, Fe, Zr) 17 magnet powder.
  • the magnetic film thus obtained had a thickness of 315 ⁇ m, a density of 4.11 g / cm 3 and a remanence of 0.35 T with a coercive field strength of 11.4 kOe.
  • the demagnetization curve of this film is shown in Figure 3.
  • Example 2 The procedure was as in Example 2 except that an anisotropic NdFeB magnet powder of the type Magnequench MQP-T ® was used, and the film exposed after 0.5 min drying time, a magnetic field of 2.4-2.9 kOe parallel to the surface, so that could align the powder particles in the not yet solidified film.
  • the finished anisotropic film had a thickness of 333 ⁇ m, a density of 4.0 g / cm 3 , a remanence of 0.505 T parallel to the surface and a coercive field strength of 11.5 kOe.
  • the demagnetization curve of this film is shown in Figure 4.
  • Example 2 Magnetic powder: VACOMAX ® 240
  • the procedure was analogous to Example 1 (magnetic powder: VACOMAX ® 240), but after 0.5 min drying time the film was exposed to external magnetic fields pulsed to align the anisotropic powder particles parallel to the surface.
  • the field strength was varied between 15 kOe (12 kA / cm) and 45 kOe (36 kA / cm).
  • the demagnetization curves of the anisotropic magnetic foils thus obtained are shown in Figure 5 together with that of a corresponding isotropic foil. It can be seen that the remanence increases parallel to the surface from 0.26 T for the isotropic film to 0.46 T after alignment at 45 kOe.
  • the corresponding values after alignment at 15 kOe, 20 kOe and 30 kOe are 0.37 T, 0.41 T and 0.43 T.
  • Degree of orientation f 0 improved from 0.5 for the isotropic magnetic foil to 0.95.
  • the coercive field strength decreases due to the improved orientation from 11.5 kOe for the isotropic magnetic foil to approx. 9 kOe for the anisotropic magnetic foil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Moulding By Coating Moulds (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

L'invention concerne des films magnétiques durs constitués d'une matrice polymère dans laquelle sont réparties des particules pulvérulentes magnétiques dures. Ces films présentent une épaisseur de préférence comprise entre 100 et 500 mu m et sont souples. Ils peuvent être produits au moyen d'un procédé de coulée et conviennent par exemple, comme composants magnétiques durs dans des micromoteurs, des relais polarisés ou des détecteurs.
EP99907508A 1998-02-09 1999-02-05 Procede de fabrication d'un film magnetique Expired - Lifetime EP1053552B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH31398 1998-02-09
CH31398 1998-02-09
PCT/EP1999/000779 WO1999040592A1 (fr) 1998-02-09 1999-02-05 Film magnetique et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP1053552A1 true EP1053552A1 (fr) 2000-11-22
EP1053552B1 EP1053552B1 (fr) 2003-02-05

Family

ID=4184166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99907508A Expired - Lifetime EP1053552B1 (fr) 1998-02-09 1999-02-05 Procede de fabrication d'un film magnetique

Country Status (5)

Country Link
US (1) US6464894B1 (fr)
EP (1) EP1053552B1 (fr)
JP (1) JP2002503027A (fr)
DE (1) DE59904223D1 (fr)
WO (1) WO1999040592A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6773765B1 (en) * 1999-11-04 2004-08-10 The Research Foundation Of State University Of New York Thermally sprayed, flexible magnet with an induced anisotropy
BR0115626A (pt) * 2000-11-26 2003-08-26 Megnetnotes Ltd Substratos magnéticos, composição e método para a feitura dos mesmos
US7338573B2 (en) * 2000-11-26 2008-03-04 Magnetnotes, Ltd. Magnetic substrates with high magnetic loading
US7501921B2 (en) * 2005-05-13 2009-03-10 Magnetnotes, Ltd. Temperature controlled magnetic roller
US7854878B2 (en) * 2007-01-23 2010-12-21 International Business Machines Corporation Method for forming and aligning chemically mediated dispersion of magnetic nanoparticles in a polymer
DE102008024780A1 (de) * 2008-05-23 2009-11-26 Osram Gesellschaft mit beschränkter Haftung Drahtlos speisbares Leuchtmittel
WO2012031462A1 (fr) * 2010-09-10 2012-03-15 广州新莱福磁电有限公司 Film plastique magnétique flexible comportant des plastiques recyclés ajoutés
BR112013010024A2 (pt) 2010-10-27 2016-08-02 Kraft Foods Global Brands Llc embalagem para acomodar produto a qual pode ser fechada de forma magnética
WO2013082685A1 (fr) * 2011-12-05 2013-06-13 Universidade Federal De Pernambuco Matière organique magnétique
US9028951B2 (en) 2013-09-10 2015-05-12 Magnetnotes, Ltd. Magnetic receptive printable media

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US3070841A (en) * 1960-12-07 1963-01-01 Goodrich Co B F Method and apparatus for making magnetically anisotropic elongated magnets
US3467598A (en) * 1967-01-16 1969-09-16 Goodrich Co B F Processing aids in preparation of sbr flexible magnets
US3764539A (en) * 1970-10-14 1973-10-09 Community Building Ass Of Wash Flexible ferrite permanent magnet and methods for its manufacture
JPS5085897A (fr) * 1973-12-03 1975-07-10
US4200457A (en) * 1979-01-22 1980-04-29 Cape Arthur T Ferrous base alloy for hard facing
DE3006736A1 (de) * 1979-02-23 1980-09-04 Inoue Japax Res Verfahren und vorrichtung zur herstellung eines elastomeren magnetischen gegenstandes
US4983232A (en) * 1987-01-06 1991-01-08 Hitachi Metals, Ltd. Anisotropic magnetic powder and magnet thereof and method of producing same
US4881988A (en) * 1987-11-16 1989-11-21 Rjf International Corporation Novel flexible magnet for use in small dc motors
JPH01313903A (ja) * 1988-06-14 1989-12-19 Kubota Ltd 希土類系樹脂磁石用コンパウンドおよび樹脂磁石
DE4228520C2 (de) * 1992-08-27 2000-10-26 Vacuumschmelze Gmbh Verfahren zur Herstellung von dünnwandigen kunststoffgebundenen Dauermagnetformteilen, wie zum Beispiel Schalenmagneten
US5607768A (en) * 1995-05-15 1997-03-04 General Motors Corporation Lubricous polymer-encapsulated ferromagnetic particles and method of making
TW338167B (en) * 1995-10-18 1998-08-11 Seiko Epson Corp Rare-earth adhesive magnet and rare-earth adhesive magnet components

Non-Patent Citations (1)

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Title
See references of WO9940592A1 *

Also Published As

Publication number Publication date
EP1053552B1 (fr) 2003-02-05
JP2002503027A (ja) 2002-01-29
US6464894B1 (en) 2002-10-15
DE59904223D1 (de) 2003-03-13
WO1999040592A1 (fr) 1999-08-12

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