EP1053552B1 - Procede de fabrication d'un film magnetique - Google Patents

Procede de fabrication d'un film magnetique Download PDF

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Publication number
EP1053552B1
EP1053552B1 EP99907508A EP99907508A EP1053552B1 EP 1053552 B1 EP1053552 B1 EP 1053552B1 EP 99907508 A EP99907508 A EP 99907508A EP 99907508 A EP99907508 A EP 99907508A EP 1053552 B1 EP1053552 B1 EP 1053552B1
Authority
EP
European Patent Office
Prior art keywords
film
hard
magnetic
magnetic powder
casting
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.)
Expired - Lifetime
Application number
EP99907508A
Other languages
German (de)
English (en)
Other versions
EP1053552A1 (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

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    • 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 method for producing a hard magnetic film based on polymer, in particular for Use in electric motors or for sensor applications.
  • EP-A-0274034 consists of synthetic resin-bonded magnets made of a polymer and a hard magnetic powder known.
  • the powder used there is an Nd alloy and has a particle size of 80 ⁇ m and less.
  • the magnets can be made relatively thin, but are not foils.
  • the object of the present invention is therefore an economical Process for the production of a flexible hard magnetic To provide material of small thickness.
  • this object is achieved by a manufacturing process solved according to claim 1.
  • carrier-free hard magnetic foils made of a polymer matrix and a hard magnetic powder distributed therein manufacture.
  • trapped means here that the finished foils are not - as for example as Magnetic tapes or "floppy disks" known films - from one non-magnetic carrier and a magnetizable one or are built on both sides, but from one only continuously magnetic or magnetizable Layer.
  • the hard magnetic powder is useful an average particle size of less than 100 ⁇ m, preferably less than 20 ⁇ m.
  • the magnetic foils according to the invention are produced by that (i) a powder made of a hard magnetic material in a solution or dispersion of a polymer material dispersed in a volatile solvent, (ii) so dispersion obtained as a film of defined thickness on a rotating Casting belt cast, (iii) the solvent evaporates and (iv) peeling off the film thus formed from the casting belt becomes. Magnetization of the foil can occur after evaporation the solvent or at a later time (e.g. after assembly), due to the integration the magnetic particle into the polymer matrix is isotropic Magnetic sheet is obtained.
  • the orientation of the hard magnetic powder particles takes place in the process by an external magnetic field between the casting process and peeling off the film.
  • Orientation before solidification is particularly preferred of the cast film.
  • Particles made of an anisotropic material can form here align in the external magnetic field so that an anisotropic Magnetic sheet is obtained.
  • the magnetization and optionally alignment can preferably by means of a pulsed magnetic field become. This allows high field strengths with electromagnets can be achieved with low energy consumption. Especially easily orientable hard magnetic powder particles can also oriented in the air gap of a suitable permanent magnet yoke become.
  • a preferred volatile solvent for soluble polyvinylidene fluoride (Copolymer) is acetone.
  • the films according to the invention advantageously have a thickness of 50 to 2000 microns, preferably 100 to 500 microns.
  • the volume fraction of the hard magnetic powder in the invention Magnetic film can be adjusted as required. It is preferably at least 50%, particularly preferably at least 60%. It is possible to keep the polymer content as low to keep the polymer practically just the gaps one fills approximately dense packing of the powder particles.
  • the hard magnetic powder contained in the invention Foils preferably one or more rare earth alloy (s). However, it is also within the scope of the invention others hard magnetic materials such as Al-Ni-Co or Use 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 one or more elements 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 VACO-DYM® from Vacuumschmelze GmbH or available under the MAGNEQUENCH® brand from Magnequench Inc.
  • the polymer matrix can basically be made of any volatile Solvent-soluble or dispersible polymers. But it is also possible to use polymers that from low-viscosity monomers or oligomers to suitable ones Way are available in thin layers. In these cases can optionally be used during manufacture be dispensed with from solvents.
  • soluble thermoplastic materials used, in particular soluble polyvinylidene fluoride.
  • non-thermoplastic materials such as Use one-component polyurethane dispersions.
  • the hard magnetic powder particles can be random (isotropic) arranged or, if they have an inherent anisotropy, if necessary be aligned. Are preferred 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 determined and is preferably 0.2 to 0.8 Tesla.
  • the continuous casting belt is preferably made of matt Stainless steel.
  • a device for producing the magnetic film according to the invention is shown in Figure 1.
  • the real one Casting device comprises a temperature-controllable storage container 1 with stirring device for the casting solution or dispersion, a controllable feed pump 2, a filter device 3 for Separation of agglomerates and the caster 4.
  • the casting solution or dispersion is poured onto an endless casting belt 5, which revolves over rollers 6, 7 and of heating elements 8 indirectly is heated.
  • the casting belt is over one of the rollers, which are provided with a speed-controlled drive 16 is driven.
  • a cooling device 9 cools if necessary the magnetic film 11 before pulling it off the casting belt a removal device 10.
  • the magnetic film can possibly contain solvent residues before winding on a winding mandrel 13 of a drying undergo in a drying section 12, wherein the film is advantageously supported by a carrier web 14 becomes.
  • the carrier web can optionally also be used as a release film serve and wound up together with the magnetic sheet be (not shown).
  • An electromagnet is advantageous for magnetizing the film or permanent magnet yoke 17 attached at a short distance above the casting belt.
  • the entire pouring and drying device is advantageously surrounded by a housing 15, which reduces heat loss and in combination with a suction and filter device prevents the production rooms from being exposed to solvent vapors.
  • Gear pumps or peristaltic pumps, for example, can be used as feed pumps 2 become.
  • the pourer 4 can be used both as a pressure pourer, in which the casting solution is supplied by the feed pump 2 is fed directly to the casting gap with increased pressure, and also as an open one Scraper, which works only with hydrostatic pressure, be trained. In both In certain cases, the pressure or the filling level kept constant.
  • the film thickness is essentially the width of the The casting gap between the pourer 4 and the casting belt 5 is determined.
  • the heating devices 8 preferably supply the heat as radiant heat. to Support of the drying process and the removal of solvent vapors advantageously heated air supplied. It is also possible to use the heat, for example transferred to the casting belt via heated rollers or by direct passage of electricity or to be heated inductively. Finally, the cast film can also pass through Microwave energy can be heated.
  • the casting device can be equipped with one or more Means for cooling 9 may be provided. These can, for example, be cooled Drums or rollers, over which the casting belt 5 is guided, can be formed that the cooling takes place indirectly. On the other hand, there are also facilities for direct The film can be cooled, for example in the form of suitably arranged nozzles for inflation of cold air or other cooling media. Of course there is also a combination both measures possible.
  • the Removal device 10 suitably designed so that no excessive pull on the Foil is exerted, which leads to undesirable stretching or even tearing the slide could lead.
  • the removal device advantageously consists of a roller or a pair of rollers, which exerts a controlled tensile stress on the film and preferably is arranged so that a take-off angle of 15 ° to 45 ° results.
  • a cutting and stacking device can alternatively also be used be provided 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.
  • 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 were further produced with densities of 3.6-3.7 g / cm 3 and 4.0-4.1 g / cm 3 , respectively ,
  • the films had a remanence of 0.2-0.29 T with a coercive field strength of 10.6 kOe.
  • the demagnetization curves of the exemplary films are shown in Figure 2.
  • 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, but an anisotropic NdFeB magnetic powder of the type MAGNEQUENCH® MQP-T was used and the film was exposed to a magnetic field of 2.4-2.9 kOe parallel to the surface after a drying time of 0.5 min, 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 film was exposed after 0.5 minutes of drying time to align the anisotropic powder particles with pulsed external magnetic fields 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.

Landscapes

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

Claims (15)

  1. Procédé de fabrication d'une feuille magnétique dure constituée d'une matrice polymère et d'une poudre magnétique dure qui y est répartie, avec une taille particulaire moyenne inférieure à 100 µm, de préférence inférieure à 20 µm,
    caractérisé en ce qu'
    il comprend au moins les étapes de
    (i) fabrication d'une dispersion d'une poudre magnétique dure ayant une taille particulaire moyenne inférieure à 100 µm, dans une solution ou dispersion d'un matériau polymère dans un solvant volatil,
    (il) coulée de la dispersion de la poudre magnétique dure sous la forme d'une pellicule d'épaisseur définie sur une bande sans fin,
    (iii) vaporisation du solvant et
    (iv) détachement de la feuille ainsi formée de la bande de coulée.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    entre le processus de coulée (ii) et le détachement de la feuille (iv) on magnétise et on oriente les particules de la poudre magnétique dure sous l'action d'un champ magnétique externe.
  3. Procédé selon la revendication 2,
    caractérisé en ce qu'
    on procède à la magnétisation et à l'orientation avant que la pellicule coulée ne se soit solidifiée.
  4. Procédé selon la revendication 2 ou 3,
    caractérisé en ce que
    le champ magnétique externe est à impulsions.
  5. Procédé selon la revendication 2 ou 3,
    caractérisé en ce que
    le champ magnétique externe est produit par une culasse d'aimant permanent.
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce qu'
    on utilise comme poudre magnétique dure un alliage de terre rare.
  7. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce qu'
    on utilise comme alliage de terre rare un alliage de formule générale SECo5, (SE)2(Co, Fe, Cu, Zr)17 ou (SE)2Fe14B, dans laquelle SE représente un ou plusieurs des éléments Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb ou Lu.
  8. Procédé selon l'une des revendications 1 à 7,
    caractérisé en ce qu'
    on utilise comme matériau polymère le fluorure de polyvinylidène,
  9. Procédé selon la revendication 8,
    caractérisé en ce qu'
    on utilise comme solvant volatil l'acétone.
  10. Procédé selon l'une des revendications précédentes,
    caractérisé par
    une épaisseur de la feuille allant de 50 à 2000 µm.
  11. Procédé selon la revendication 10,
    caractérisé par
    une épaisseur de la feuille allant de 100 à 500 µm.
  12. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la proportion volumique de la poudre magnétique dure s'élève à au moins 50 %.
  13. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les particules de poudre magnétique dure sont orientées parallèlement ou perpendiculairement à la surface de la feuille.
  14. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la feuille possède une rémanence magnétique de 0,2 à 0,8 T.
  15. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la taille particulaire moyenne est inférieure à 20 µm.
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 EP1053552A1 (fr) 2000-11-22
EP1053552B1 true 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
CA2680699C (fr) * 2000-11-26 2013-05-14 Magnetnotes, Ltd. Substrats magnetiques, composition et procede permettant de les fabriquer
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
EP2632809B1 (fr) 2010-10-27 2015-11-18 Intercontinental Great Brands LLC Paquet contenant des produits et pouvant se fermer magnétiquement
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
DE59904223D1 (de) 2003-03-13
US6464894B1 (en) 2002-10-15
EP1053552A1 (fr) 2000-11-22
WO1999040592A1 (fr) 1999-08-12
JP2002503027A (ja) 2002-01-29

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