WO2004033135A1 - Piece moulee magnetique douce fabriquee selon un procede de metallurgie des poudres et presentant une grande permeabilite maximale, procedes de fabrication et utilisation associes - Google Patents

Piece moulee magnetique douce fabriquee selon un procede de metallurgie des poudres et presentant une grande permeabilite maximale, procedes de fabrication et utilisation associes Download PDF

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Publication number
WO2004033135A1
WO2004033135A1 PCT/EP2003/005209 EP0305209W WO2004033135A1 WO 2004033135 A1 WO2004033135 A1 WO 2004033135A1 EP 0305209 W EP0305209 W EP 0305209W WO 2004033135 A1 WO2004033135 A1 WO 2004033135A1
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WO
WIPO (PCT)
Prior art keywords
powder
organofunctional silanes
annealing
molded part
powder particles
Prior art date
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PCT/EP2003/005209
Other languages
German (de)
English (en)
Inventor
Johannes Tenbrink
Robert Brand
Burkhard Kraus
Georg-Werner Reppel
Original Assignee
Vacuumschmelze Gmbh & 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
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Application filed by Vacuumschmelze Gmbh & Co. Kg filed Critical Vacuumschmelze Gmbh & Co. Kg
Publication of WO2004033135A1 publication Critical patent/WO2004033135A1/fr

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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
    • H01F41/02—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 manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • 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
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102—Metallic powder coated with organic material
    • 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
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
    • H01F1/14758—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated by macromolecular organic substances
    • 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
    • H01F1/26—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 by macromolecular organic substances
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water

Definitions

  • the invention relates to a powder-metallurgically produced soft-magnetic molded part with high maximum permeability, and a method for producing this molded part from metallic powder particles, the powder particles being provided with an electrical insulation layer, so that when the molded part is used as a magnetic core in alternating fields, as described, for example, in Fast switching solenoid valves can occur, the eddy current losses are low. Furthermore, the invention relates to the use of this molded part in dynamic applications, such as, for example, as magnetic cores in magnetic valves in injection systems of motor vehicles, as cores of ignition coils, as yokes in magnetic systems for valve control or as a rotor or stator in engine applications.
  • No. 2,601,212 proposes a process for the production of soft magnetic powder composite materials for applications in the high-frequency range in which phosphated carbonyl iron is mixed with 1 to 6% by weight of organosilanes as a binder. After pressing, the molded parts are cured at temperatures around 150 ° C. Annealing and thus decomposition of the organosilanes does not take place, which means that the organosilanes are polymerized and are in the finished product
  • the molded parts produced are Usage frequencies below 10 kHz are unsuitable.
  • Powder particles the strength of the molded part.
  • a similar process with subsequent annealing is described in German patent application 39 070 950.5.
  • the application shows that protection of the powder particles, which are provided with phosphate insulation, is possible during the pressing by means of an organic resin layer.
  • a further object of the present invention is to provide a soft magnetic powder-metallurgically produced molded part with fast response behavior, whereby a good response behavior means according to the invention that the frequency-dependent maximum permeability of a core made of this material in the entire frequency band from 0 to 4 kHz is preferably at least 200 ,
  • the essential idea of the present invention lies on the one hand in the insulating effect of the material and on the other hand in the lubricating effect of the silane layer.
  • the latter results from the fact that the organofunctional silane is not polymerized out to siloxane, as is the case in the above-mentioned US Pat. No. 2,601,212. This would take place at temperatures of approx. 100 - 150 ° C, but the powder is only dried at approx. 50 ° C in the coating process.
  • the subsequent annealing of the pressed parts then leads to polymerization, but the resulting siloxanes are not very temperature-resistant, so that they are destroyed above approx. 200 ° C. It essentially remains Si0 2 in the material.
  • annealing in which the organosilanes are decomposed, after pressing is suitable for reducing the losses mentioned.
  • the highest possible temperatures in the range of approximately 1100 ° C. would be desirable. At this temperature, however, the phosphate insulation on the surface of the powder particles would be destroyed.
  • the proportion of the pressing aid can be significantly reduced.
  • pressing aids are added in an amount of approximately 0.5% by weight. This proportion can be reduced to 0.25 or 0.125% by weight or even 0% by weight using the silane. This is advantageous for the resulting density of the material and for the specific total power loss (in W / kg).
  • the eddy current losses in turn contain two parts. On the one hand, the eddy currents flow within the powder particles, on the other hand also over the entire part volume:
  • the organofunctional silanes react in the reaction products that are produced under the corresponding reaction conditions.
  • reaction products are silicon oxides and silicon carbides.
  • molded parts which contain powder particles isolated in a known manner, for example powder particles isolated by means of phosphates, are further improved by using organofunctional silanes can.
  • the properties of the molded part according to the invention also improve compared to an insulation layer formed exclusively by the use of a substance containing silicon.
  • the molded parts according to the invention have a higher maximum permeability than all known molded parts with a comparably high mechanical strength.
  • a primary winding with 100 turns and a secondary winding with 20 turns are applied to an insulated ring of the sample with the dimensions 33 x 20 x 6 mm 2 (outer / inner diameter / height).
  • the field is excited by means of a sine voltage with an adjustable frequency.
  • the induction voltage on the secondary winding is determined with a voltmeter.
  • the values according to the invention for the maximum permeability at 50 Hz essentially correspond to the value of the maximum permeability in the static field.
  • the maximum permeability is preferably at least 200. It is particularly preferred if the maximum permeability between 0 and 4 kHz is above 300, in particular 350. Moldings whose maximum permeability is between 0 and 4 kHz above 400 are very particularly preferred.
  • the frequency-dependent permeability at high modulation (1 T) for the molded parts according to the invention is preferably at least 200, in particular 250.
  • the flexural strength of the molded parts according to the invention is preferably at least 30 N / mm 2 . Values of more than 50 N / mm 2 , in particular 60, are particularly preferred
  • the ferromagnetic material used according to the invention is preferably iron, cobalt iron, nickel iron or silicon iron, which is used in the form of a powder. Although the highest possible level of purity is preferred for the ferromagnetic material, minor impurities due to manufacturing technology are practically unavoidable.
  • the ferromagnetic material according to the invention therefore contains small amounts of impurities such as nitrogen, oxygen, sulfur or carbon.
  • the carbon content is preferably below 0.1%, in particular below 0.03%.
  • the nitrogen content is preferably below 0.01%, in particular below 0.003%.
  • Examples of commercially available iron powders which can be used according to the invention are those with the designations "AT40.29", “ASC100.29” and "ABC100.30" from Höganäs AB, Sweden.
  • a value of at least about 50 ⁇ m is preferably expedient for the particle size (d 50 ) of the powder particles.
  • larger particles also lead to higher maximum permeabilities.
  • An upper limit can expediently be specified at 400 ⁇ m.
  • a range from 50 to 200 ⁇ m is particularly preferred since there is an upper limit due to the eddy current losses occurring in the alternating field.
  • a range from more than 200 to about 400 ⁇ m is particularly preferred.
  • the coercive field strength of the molded parts according to the invention is preferably 1 to 3 A / cm.
  • electrical losses occur in the molded part according to the invention, which essentially consist of hysteresis losses and eddy current losses. As a rule, the losses increase at higher frequencies. Losses in the sense of the invention are understood to mean the total losses from all measured losses.
  • the specific resistance of the molded parts is preferably greater than 500 ⁇ m.
  • the invention also relates to a method for producing a magnetizable molded part comprising the steps:
  • organofunctional silanes which can be used are substances which are preferably building blocks of the general formula
  • X is an easily hydrolyzable group and R represents an organic radical.
  • Examples of easily hydrolyzable groups are Cl, OCH 3 , OCH 2 H 5 or OCH 2 CH 2 OCH 3 .
  • Suitable organic radicals are, for example, hydrogen or aliphatic or aromatic radicals having 2 to 10 carbon atoms, which can either be unsubstituted or partially substituted.
  • Suitable substituents are, for example, F, Br, I or preferably chlorine.
  • Unsubstituted organic radicals are preferably used.
  • the organofunctional silanes containing substances used are, for example, vinyl silanes, such as vinyl trichlorosilane, vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tris ( ⁇ -metoxyethoxy) silane or vinyl triacetoxysilane, aminosilanes, such as ⁇ -aminopropyl-triethoxysilane, ⁇ -trimethoxysilane, ⁇ N-ß- (aminoethyl) - ⁇ -aminopropyltrimethoxysilane or N-ß- (aminoethyl) - ⁇ -aminopropyltrimethoxysilane or N-ß- (aminoethyl) -N- (ß-aminoethyl) - ⁇ -aminopropyltrimetoxysilane, Ureisosalkylsilane, Epoxyalkylsi- lanes, such as ß-glyxid
  • the proportion by weight of the organofunctional silanes is preferably in the range from 0.1 to 3% by weight, in particular 0.25 to 2% by weight.
  • lubricants for improving the pressing density are preferably present in the molded parts.
  • suitable lubricants are calcium, lithium, magnesium, zinc stearate and stearic acid.
  • other lubricants are also conceivable as long as they have a supporting effect on the pressing process and do not have a disadvantageous effect on the pourability of the powder.
  • Lithium stearate, stearic acid or Ca stearate is preferably used as a lubricant in an amount which on the one hand sufficiently supports the pressing process, but on the other hand still leads to high maximum permeabilities.
  • the proportion by weight is preferably in the range from 0 to 5% by weight, in particular between 0 and 0.6% by weight.
  • the powders which can be used according to the invention can be used annealed (pretreated) or unannealed. If the powders are used in an annealed state, a reducing atmosphere, in particular a hydrogen-containing atmosphere, is preferred.
  • the powder is treated in a manner known per se, as described, for example, in W. Rausch et. al, "The phosphating tion of metals ", 2nd edition, Eugen Leuze Verlag, Saulgau (1988).
  • thermoplastic or thermosetting plastic can be applied to the powder particles as an outer layer
  • Presses is hardened to a green body, but preferably no thermoplastic or thermoset is applied.
  • the pressing process can take place either at room temperature or at a temperature above room temperature (hot pressing).
  • hot pressing temperatures of at least 80 ° C are preferred.
  • the green body is preferably annealed in an oxidizing atmosphere, such as, for example, air or humidified hydrogen.
  • an oxidizing atmosphere such as, for example, air or humidified hydrogen.
  • the green body is preferably annealed at a temperature of at least 500 ° C.
  • the temperature is limited by the temperature at which the insulation layer becomes ineffective. For the insulation means used, this limit is preferably around 680 ° C. To increase the strength, it can be advantageous to carry out the annealing at different temperature levels.
  • the silane treatment before or after the phosphating treatment.
  • the phosphating is preferably carried out before the silane treatment.
  • the phosphates can be used in aqueous or non-aqueous solution.
  • the phosphate and silane can be carried out in one operation. It has been shown that the powder particles can be coated analogously to the method described in DE-Al-4 403 876 for the passivation of metallic surfaces of screws.
  • the silane or polysiloxane contains built-in phosphorus-oxygen assemblies, which can preferably be built in as intermediate links in polysiloxane chains (SI-0-Si-OPP-Si ).
  • the atomic ratio P: SI in the siloxane layer is preferably greater than 0.01.
  • the moldings according to the invention can have an open residual porosity, which can have a disadvantageous effect on the corrosion resistance.
  • the molded part is preferably subjected to vacuum impregnation with liquid resins and subsequent hardening after annealing.
  • Suitable resins are crosslinking or thermoplastic resins known per se, such as, for example, anaerobic methacrylate resins.
  • the penetration of the resin into the molded part can be promoted with the help of gas under pressure. Suitable pressures are advantageously in the range from 3 to 30 bar. In this way, oil and gasoline resistant molded parts with good temperature resistance up to about 250 ° C can be produced.
  • the present invention includes the use of the molded part according to the invention in solenoid valves, as cores of ignition coils or as yokes in magnet systems for valve control or as a rotor or stator in motor applications or other electrical machines.
  • FIG. 1 shows the frequency dependence of the maximum permeability of samples according to the production according to Examples 1,
  • Figure 3 shows the frequency dependence of the maximum permeability of samples according to the manufacture according to Examples 20 and 21 with a varied control of the toroid.
  • the commercially available phosphating Novaphos F 2311 (from Novamax) was dissolved in water (15 g F 2311 per liter of water) and the solution was adjusted to a pH of 5.0 at 57 ° C. using sodium hydroxide solution. The iron powder was then mixed with 1 l of the solution. After 5 minutes the reaction was stopped by rinsing with water and the powder was dried in air at 130 ° C. Mixed: (. L / cm 3 density 19d softening temperature of 90-95 ° C, Epikote ® EP 1055, from Shell) connecting the powder with a flexible after curing epoxy resin. The resin was used in the form of a 20% acetone solution and added to the powder in an amount of 2.5 g per 100 g powder (0.5% EP 1055). The mixing time was 30 minutes. The solvent was then evaporated in vacuo.
  • the powder thus produced was pressed in a non-directional press with a pressure of 600MPa into rings with an outer diameter of 33 mm, inner diameter of 20 mm and a height of 6 mm. Finally, annealing was carried out in two stages, first 1 h at 600 ° C in alternating air / vacuum and then 1 h at 520 ° C in air.
  • iron powder was provided with a phosphate layer and then coated with different organofunctional silanes.
  • the phosphated Fe powder was mixed with the silane solution in a ratio of 0.5 g of silane per 100 g of iron powder and reaction mixed for 1 hour. The mixtures were then dried in vacuo at 150 ° C. for 1.5 h. The powders were then further processed into cores in accordance with Example 1.
  • the measured maximum permeability is shown in Fig. 1 shown,
  • FIG. 1 shows the maximum permeability of the cores produced as a function of the frequency of the magnetic field compared to. Samples without the addition of organofunctional silanes (AT 40.29 OF).
  • Cores were produced in accordance with Examples 3 and 9, in which 0.5% of a lubricant was added to the powders before pressing. The powders were pressed either at room temperature (RT) or at 150 ° C.
  • the maximum permeability of the cores as a function of the frequency of the applied field is shown in FIG. 2.
  • the flexural strength was measured on 3 identical samples and the mean value was determined from the values for s B.
  • the results of the measurements are shown in Tab. 2.
  • the examples show that the permeability of powder cores can be increased by using organofunctional silanes. Especially in the frequency range up to 4 kHz and above there is a significant improvement compared to known powder cores (AT 40.29 OF).
  • the resistances were measured on rods with an oxidized surface.
  • the oxidation results from the annealing, but due to the very low porosity of the material (high density) there is only a thin oxide layer.
  • the oxide layer is a better electrical conductor than the actual powder composite.
  • the measured values of the spec. Resistance for the entire bar is therefore smaller than the spec. Resistance for the actual powder composite.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Soft Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne une pièce moulée magnétique formée de couches de particules de poudre d'un matériau ferromagnétique. Une isolation disposée entre ces particules de poudre les isole électriquement les unes des autres au moins en partie. La pièce moulée est consolidée mécaniquement par recuit. La présente invention porte également sur un procédé de fabrication et sur une utilisation associés, ce procédé comportant les étapes suivantes : traiter une poudre en matériau ferromagnétique avec un composant de phosphate ; la traiter avec un autre composant contenant des silanes organofonctionnels ou bien avec un composant contenant à la fois des phosphates et des silanes organofonctionnels ; ajouter éventuellement des auxiliaires de pressage, des liants, des résines ou des lubrifiants ; presser la poudre ainsi traitée pour former un comprimé ; soumettre le comprimé ainsi obtenu à un recuit à une température dépassant la température de décomposition des silanes organofonctionnels pour réaliser une pièce moulée mécaniquement consolidée.
PCT/EP2003/005209 2002-09-27 2003-05-17 Piece moulee magnetique douce fabriquee selon un procede de metallurgie des poudres et presentant une grande permeabilite maximale, procedes de fabrication et utilisation associes WO2004033135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10245088.9 2002-09-27
DE10245088A DE10245088B3 (de) 2002-09-27 2002-09-27 Pulvermetallurgisch hergestelltes weichmagnetisches Formteil mit hoher Maximalpermeabilität, Verfahren zu seiner Herstellung und dessen Verwendung

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WO2004033135A1 true WO2004033135A1 (fr) 2004-04-22

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Cited By (1)

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CN105772701A (zh) * 2015-12-25 2016-07-20 横店集团东磁股份有限公司 一种高叠加低损耗软磁合金材料的制备方法

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US20050162034A1 (en) * 2004-01-22 2005-07-28 Wavecrest Laboratories, Inc. Soft magnetic composites
US7449793B2 (en) 2004-02-18 2008-11-11 Bluwav Systems, Llc Portable range extender with autonomous control of starting and stopping operations
JP4134111B2 (ja) 2005-07-01 2008-08-13 三菱製鋼株式会社 絶縁軟磁性金属粉末成形体の製造方法
CN102132361B (zh) * 2008-09-02 2015-03-25 丰田自动车株式会社 压粉磁芯用粉末、压粉磁芯和它们的制造方法
DE102013221965A1 (de) 2013-10-29 2015-04-30 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Formteiles und elektrische Maschine mit einem solchen Formteil

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DE3907090A1 (de) * 1989-03-04 1990-09-06 Vacuumschmelze Gmbh Verfahren zur pulvermetallurgischen herstellung eines weichmagnetischen koerpers
EP1061534A2 (fr) * 1997-08-14 2000-12-20 Robert Bosch Gmbh Matériau composite magnétique doux déformable et son procédé de fabrication

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US2601212A (en) * 1948-11-09 1952-06-17 Gen Aniline & Film Corp Heat resistant magnetic cores and method of making
DE3439397A1 (de) * 1984-10-27 1986-04-30 Vacuumschmelze Gmbh, 6450 Hanau Verfahren zur pulvermetallurgischen herstellung eines weichmagnetischen koerpers
DE4403876A1 (de) * 1993-02-19 1994-08-25 Daimler Benz Ag Passivierungsschicht mit Polysiloxan für metallische Oberflächen und Verfahren zur Herstellung

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE3907090A1 (de) * 1989-03-04 1990-09-06 Vacuumschmelze Gmbh Verfahren zur pulvermetallurgischen herstellung eines weichmagnetischen koerpers
EP1061534A2 (fr) * 1997-08-14 2000-12-20 Robert Bosch Gmbh Matériau composite magnétique doux déformable et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105772701A (zh) * 2015-12-25 2016-07-20 横店集团东磁股份有限公司 一种高叠加低损耗软磁合金材料的制备方法

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