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WO1999030335A1 - Procede pour revetir des bandes ou des toles magnetiques - Google Patents

Procede pour revetir des bandes ou des toles magnetiques Download PDF

Info

Publication number
WO1999030335A1
WO1999030335A1 PCT/EP1998/007870 EP9807870W WO9930335A1 WO 1999030335 A1 WO1999030335 A1 WO 1999030335A1 EP 9807870 W EP9807870 W EP 9807870W WO 9930335 A1 WO9930335 A1 WO 9930335A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive
sheet
strip
tape
suspension
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.)
Ceased
Application number
PCT/EP1998/007870
Other languages
German (de)
English (en)
Inventor
Heike Hattendorf
Heinz Rudi Flender
Reimund Prachowsky
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.)
Krupp VDM GmbH
Original Assignee
Krupp VDM 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 Krupp VDM GmbH filed Critical Krupp VDM GmbH
Publication of WO1999030335A1 publication Critical patent/WO1999030335A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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
    • H01F1/16—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 sheets
    • H01F1/18—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 sheets with insulating coating

Definitions

  • the invention relates to a method for coating thin magnetic strips or sheets.
  • the parts made from it must be subjected to heat treatment in order to achieve their magnetic properties.
  • the coating must additionally prevent welding of the individual sheet or strip layers during annealing to adjust the magnetic properties to one another. Since this can take place at temperatures up to 1200 ° C depending on the material and application, the insulation material must be able to withstand these temperatures.
  • a coating process is e.g. B. from US-PS 2,796,364. It describes a solution of magnesium in an alcohol from the group consisting of methyl alcohol, ethyl alcohol and propyl alcohol.
  • a solution of magnesium methylate in methyl alcohol is used in this patent.
  • the sheets or strips to be insulated are immersed in this solution or sprayed with it and then dried. What remains is a thin layer of approx. 0.1 to 1 ⁇ m made of magnesium methylate.
  • a multiple pass is required for thicker layers. Tapes coated in this way can then be processed with relatively little tool wear. By absorbing humidity, the magnesium methylate layer changes into magnesium oxide.
  • the disadvantages of this process are the toxicity and the flammability of the methyl alcohol.
  • isolating the tapes is e.g. in the case of toroidal tape cores, in that particles of suitable grain size made of magnesium and / or aluminum oxide or other ceramic substances are also wrapped in the winding process, as was described by way of example in DE 3840 509 C2.
  • the appropriate grain size can also be used to set the distance between the belt layers, which is necessary to avoid sticking due to the remaining burr. Since the particles lie loosely on the belt, there is no tension in the material during the subsequent annealing and cooling.
  • the disadvantages of this method are the high wear on tools and machines due to the loose particles.
  • the edge areas of the toroidal cores produced in this way are not sufficiently insulated and the layers come into contact with one another, which can additionally lead to welding during the subsequent annealing.
  • the object on which the invention is based is to bring the ceramic substance of suitable grain size to adhere to the sheet or strip in such a way that the disadvantages of processing loose particles are eliminated.
  • the disadvantages of a very firmly adhering layer, such as in the case of coating with magnesium methylate, are to be avoided, the substance being to lie between the layers after annealing without firm adhesion, so that no tension can occur in the material.
  • This object is achieved by a method for coating thin magnetic tapes or sheets, in that particles of predeterminable grain size made of ceramic substances, such as magnesium and / or aluminum oxide, optionally in a liquid, are applied to the tape or the sheet by means of an adhesive.
  • the adhesive is to be chosen so that it is made after the parts have been made from the coated strip or sheet, e.g. B the toroidal cores or the core laminated core can be removed without leaving any residue.
  • Adhesives consist largely of carbon. The most suitable way to remove carbon is to use an oxygen-containing gas e.g. B. burn air. Other atmospheres e.g. B. hydrogen or nitrogen pose the risk of the formation of polycyclic hydrocarbons, which can then be burned without residue in the flame of the protective gas, but also condense beforehand depending on the length of the molecules formed and contaminate the pipes and the furnace.
  • Burning the adhesive removes material between the turns or layers. This process loosens the toroidal core somewhat and thus additionally reduces the occurrence of stresses in the toroidal core during annealing to adjust the magnetic properties.
  • the adhesive should be water soluble.
  • a suitable adhesive for these conditions is, for example, a material based on cellulose ethers, for example methyl celluloses, hydroxypropyl celluloses or hydroxypropyl methyl cellulose, which are also used, among other things, in medication as a shell for the tablet core. They stick well when processed correctly.
  • the layer is not rigid but deformable, so that all further processing steps such as bending, kinking, cutting and punching are possible without the layer being chipped. It is also possible to scrape off the layer in partial areas, so that parts of the strip are exposed, for example for spot welding can.
  • the adhesive can also be dissolved in water again after drying, which makes the coating system very easy to use.
  • the mixture of the adhesive dissolved in water with the particles is a suspension.
  • Their viscosity can be varied within a wide range by the choice of cellulose ether and the dilution and can thus be adapted to the respective type of application. It is advisable to avoid the area of coarse particles in combination with a very thin adhesive solution in order not to get suspensions that tend to settle too much. Spraying, brushing, dipping and electrophoresis are possible application options for low-viscosity suspensions.
  • suspensions of higher viscosity application via plastic rollers with a profile is useful, e.g. B. described in EP 0 480 265 B1 or DE 42 38 150 A1.
  • the suspension can be applied on one or both sides. If the tape is well degreased, the suspension can be applied without further additives. A wetting agent can be added to improve the application. After the application process, the suspension must be dried. The burning temperature of the adhesive must not be exceeded.
  • the band or sheet coated in this way can, for. B. processed to toroidal cores, core laminated core and other parts.
  • the adhesive is burned at temperatures between 250 and 450 ° C, preferably at temperatures between 300 ° C and 400 ° C, under an oxidizing atmosphere (e.g. air).
  • the parts can then be subjected to the normal annealing process which sets the magnetic properties.
  • Toroidal tape cores were made from tape coated on both sides with suspension 1. These were annealed in air at 360 ° C to burn the adhesive. The toroidal cores were then annealed to adjust their magnetic properties.
  • Table 2 shows the mean values of the permeabilities achieved in comparison to toroidal cores in which particles were directly wrapped in the winding process (particles directly in Tables 2 and 3) from the same batch of an 80% Ni 15% Fe 5% Mo alloy with 60 ⁇ m tape thickness.
  • Table 3 shows another example of toroidal tape cores from a different batch of the 80% Ni 15% Fe 5% Mo alloy with a tape thickness of 60 ⁇ m.
  • Tables 2 and 3 show that higher permeabilities can be achieved with the cores coated with the suspension according to the invention due to the more uniform insulation of the tape.
  • the layer thickness or the particle supply was chosen so that - as generally desired - the greatest possible fill factor was achieved, but no sticking to the edges occurred due to the remaining burr.
  • Table 4 shows a comparison between toroidal cores, in which particles were directly wrapped in the winding process with toroidal cores, which were made from magnesium methylate-coated ribbon, from the same batch of an 80% Ni 15% Fe 5% Mo alloy with a ribbon thickness of 80 ⁇ m.
  • Table 5 also shows a further example produced in the same way as in Table 4 with another batch of the 80% Ni 15% Fe 5% Mo alloy with a strip thickness of 80 ⁇ m.
  • the ring band cores coated with magnesium methylate have significantly lower permeabilities.
  • the cause is the layer adhering very firmly to the belt surface.
  • Punch rings were made from a tape coated with suspension 1 on both sides and made of a 75% Ni 18% Fe 5% Cu 2% Cr alloy with a tape thickness of 350 ⁇ m. These were layered into packages and then annealed in air at 360 ° C to burn the glue. This was followed by annealing to adjust the magnetic properties.
  • Table 5a shows the permeabilities achieved in comparison to punched rings which were produced from tape coated with magnesium methylate from the same batch of a 75% Ni 18% Fe 5% Cu 2% Cr alloy with a tape thickness of 350 ⁇ m and in the same annealing to set the magnetic Properties were annealed.
  • the core plate packages coated with magnesium methylate have significantly lower permeabilities. If the glow is set to adjust the magnetic properties without removing the adhesive from cellulose ether - in this example at 1 200 ° C under hydrogen - after a few glowings, the permeability will decrease, which cannot be completely eliminated even by extending the glow times leaves.
  • An example with toroidal cores from a batch of an 80% Ni 15% Fe 5% Mo alloy with a ribbon thickness of 60 ⁇ m is shown in Table 6. The toroidal cores were wound from ribbon coated with suspension 1 and immediately afterwards subjected to annealing to adjust the magnetic properties. Annealing No. 1 in the first row of Table 7 shows the original level of the mean values of the permeabilities ⁇ and ⁇ max .
  • the annealing shown in the second line shows that the level of the permeabilities ⁇ 4 and ⁇ max after 16 further annealing can be maintained in the same furnace with the same ring torch cores by extending the annealing time. After 7 further anneals in the same furnace with the same ring band cores, the permeabilities ⁇ 4 and ⁇ max decrease despite a further increase in the annealing times. An examination of the furnace and the gas discharge pipes showed partly tar-like deposits from polycyclic hydrocarbons.
  • ring cores were then wound from strip coated with suspension 1 and annealed at 360 ° C. in air in order to burn the adhesive of the coating. Thereafter, they were subjected to annealing treatment at 1200 ° C / 5 hours under hydrogen to adjust the magnetic properties. Even after 17 anneals in this furnace with toroidal cores wound from ribbon coated with suspension 1, which were annealed in air at temperatures of 360 ° C, a constant high level of the mean values of the permeabilities ⁇ 4 and ⁇ max was achieved with the short annealing time of 5 hours reached (Table 8), which was higher than for incandescent 18 and 21 in Table 7. The previously observed contamination of the furnace and the gas discharges no longer occurred.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne un procédé de revêtement fondé sur le revêtement de bandes métalliques ou de tôles avec une suspension de particules d'oxyde de magnésium et/ou d'aluminium ou bien constituée d'autres substances céramiques. Cette suspension est appliquée sur la bande et séchée. La bande subit ensuite un traitement ultérieur. Lors d'un processus de combustion subséquent, l'adhésif est à nouveau enlevé. Le matériau est ensuite soumis à un traitement de recuit nécessaire à l'ajustement des propriétés magnétiques.
PCT/EP1998/007870 1997-12-11 1998-12-03 Procede pour revetir des bandes ou des toles magnetiques Ceased WO1999030335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19754996.9 1997-12-11
DE1997154996 DE19754996C2 (de) 1997-12-11 1997-12-11 Verfahren zur Beschichtung magnetischer Bänder oder Bleche

Publications (1)

Publication Number Publication Date
WO1999030335A1 true WO1999030335A1 (fr) 1999-06-17

Family

ID=7851512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/007870 Ceased WO1999030335A1 (fr) 1997-12-11 1998-12-03 Procede pour revetir des bandes ou des toles magnetiques

Country Status (3)

Country Link
DE (1) DE19754996C2 (fr)
TW (1) TW440473B (fr)
WO (1) WO1999030335A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109290158A (zh) * 2018-08-31 2019-02-01 北京曙光航空电气有限责任公司 一种氧化镁薄膜滚涂法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020134300A1 (de) 2020-12-18 2022-06-23 Vacuumschmelze Gmbh & Co. Kg Wasserbasierte alkalische Zusammensetzung zum Bilden einer Isolationsschicht eines Glühseparators, beschichtete weichmagnetische Legierung und Verfahren zum Herstellen eines beschichteten weichmagnetischen Bandes
EP4027357A1 (fr) 2020-12-18 2022-07-13 Vacuumschmelze GmbH & Co. KG Alliage de fecov et procédé de fabrication d'une bande à partir d'alliage de fecov
DE102020134301A1 (de) 2020-12-18 2022-06-23 Vacuumschmelze Gmbh & Co. Kg Weichmagnetische Legierung und Verfahren zum Herstellen einer weichmagnetischen Legierung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871143A (en) * 1956-06-29 1959-01-27 Allis Chalmers Mfg Co Magnetic material provided with separator coating
GB866769A (en) * 1957-01-11 1961-05-03 Allis Chalmers Mfg Co Coated metallic sheet and process of producing same
GB2132418A (en) * 1982-12-03 1984-07-04 Blum Gmbh & Co E Electrical sheet metal for the manufacture of laminated cores for static or dynamic electromagnetic devices
DE4238150A1 (de) * 1992-11-12 1994-05-19 Vacuumschmelze Gmbh Isolationsverfahren für weichmagnetische Bänder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796364A (en) * 1952-10-02 1957-06-18 Lydia A Suchoff Method of forming an adherent film of magnesium oxide
DE3840509A1 (de) * 1988-12-01 1990-06-07 Vdm Nickel Tech Verfahren zur herstellung von ringbandkernen
EP0480265B1 (fr) * 1990-10-03 1995-05-17 Nippon Steel Corporation Procédé de fabrication d'âmes en permalloy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871143A (en) * 1956-06-29 1959-01-27 Allis Chalmers Mfg Co Magnetic material provided with separator coating
GB866769A (en) * 1957-01-11 1961-05-03 Allis Chalmers Mfg Co Coated metallic sheet and process of producing same
GB2132418A (en) * 1982-12-03 1984-07-04 Blum Gmbh & Co E Electrical sheet metal for the manufacture of laminated cores for static or dynamic electromagnetic devices
DE4238150A1 (de) * 1992-11-12 1994-05-19 Vacuumschmelze Gmbh Isolationsverfahren für weichmagnetische Bänder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109290158A (zh) * 2018-08-31 2019-02-01 北京曙光航空电气有限责任公司 一种氧化镁薄膜滚涂法

Also Published As

Publication number Publication date
DE19754996C2 (de) 2000-07-06
TW440473B (en) 2001-06-16
DE19754996A1 (de) 1999-06-24

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