EP0004272A2 - Method for the manufacture of compressed masses with soft magnetic properties - Google Patents

Method for the manufacture of compressed masses with soft magnetic properties Download PDF

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Publication number
EP0004272A2
EP0004272A2 EP79100156A EP79100156A EP0004272A2 EP 0004272 A2 EP0004272 A2 EP 0004272A2 EP 79100156 A EP79100156 A EP 79100156A EP 79100156 A EP79100156 A EP 79100156A EP 0004272 A2 EP0004272 A2 EP 0004272A2
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EP
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Prior art keywords
iron powder
soft magnetic
grain size
magnetic properties
average grain
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EP79100156A
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German (de)
French (fr)
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EP0004272B1 (en
EP0004272A3 (en
Inventor
Friedrich J. Dr. Esper
Hans-Martin Dr. Wiedenmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • H01F1/20—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
    • 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
    • H01F1/28—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 dispersed or suspended in a bonding agent
    • 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
    • H01F1/33—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin
    • 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
    • H01F1/34—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 non-metallic substances, e.g. ferrites
    • H01F1/36—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 non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—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 non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/58—Processes of forming magnets

Definitions

  • the invention is based on a method according to the preamble of the main claim.
  • Soft magnetic plastic-bonded mass cores are already known which contain 95 to 99.5% by weight of carbonyl iron, the rest of organic binders.
  • the molding compound is also not flowable due to the very high proportion of filler and can therefore not be easily and uniformly filled into complicated shapes. It must also be compressed with pressures from 5000 to 18000 bar.
  • the mechanical strength of the components made from these molding compounds is low and the components are very brittle.
  • the magnetic properties of these mass cores cannot be adapted to the given extent to the desired extent.
  • Cores made of soft magnetic sintered ferrite are also known. However, these have a lower magnetic saturation polarization, a lower mechanical strength and a higher temperature dependence of the magnetic parameters.
  • the design options are limited, they can only be manufactured with larger dimensional tolerances and are relatively difficult to machine.
  • Such cores are also made from transformer or dynamo sheet. However, due to eddy current losses, these can only be used up to approx. 1 kHz. In addition, such cores are limited to certain designs and require packaging, which may is expensive. Thin Ni-Fe alloy sheets with a sheet thickness of up to 0.03 mm, which can also be used for frequencies up to 100 kHz and also have higher permeabilities, are expensive and difficult to process.
  • the method according to the invention with the characterizing features of the main claim has the advantage that it can be used to inexpensively produce magnets that can be used in sheared magnetic circuits with alternating magnetization up to frequencies of 100 kHz. Due to the flowability of the molding compound, it is easily possible, using the methods customary in plastics technology, to produce complex-shaped components from the molding compound with dimensional accuracy.
  • the pressure to be applied is relatively low at 200 to 2000 bar compared to the plastic-bonded mass cores mentioned above. By varying the starting components, the filler and the pressure, the magnetic properties can be adapted to the existing requirements to a large extent.
  • the cores according to the invention Compared to soft magnetic sintered ferrites, the cores according to the invention have a higher magnetic saturation polarization, better mechanical strength properties and a lower temperature dependence of the magnetic parameters. The possibilities of shaping are further extended, the cores can be manufactured with closer dimensional tolerances and can be machined more easily if necessary. In addition, the mass cores produced by the method according to the invention can be used more advantageously in circles with DC bias because of their higher saturation polarization than the soft magnetic sintered ferrites. Compared to cores made from conventional transformer or dynamo sheets, the high frequency range in which the ground cores produced by the method according to the invention can be used and the possibility of producing cores with complicated designs are particularly worth mentioning.
  • a mixture of an iron powder, which was obtained by atomization, as a sponge or electrolyte iron powder, and 30% by weight carbonyl iron powder with an average grain size of preferably 90 ⁇ m are mixed with about 50% by volume of a liquid polyester resin brought about 100 ° C heated press and pressed at a pressure of 1000 bar for about 40 seconds.
  • the excess polyester resin is pressed out through the column of the mold, the column having a width which is smaller than the average grain size of the magnetic powder, but so large that the excess build-up time from 1 to 30 seconds through this column Binding resin can leak.
  • This squeezing is essential since otherwise the high degrees of filling cannot be achieved while at the same time achieving sufficient flowability of the molding compound at the beginning of the pressing process.
  • the hardened magnetic body can be removed from the mold.
  • a magnetic body is produced from a mixture of the above iron powder with 10% by weight carbonyl iron powder in approx. 50% by volume phenolic resin at a pressure of 2000 bar.
  • the temperature of the mold is 140 ° C in this case.
  • This example shows that it is also possible to get by without carbonyl iron powder.
  • sieved iron powder of the type described above was used in 50% by volume. Polyester used. The pressure was 500 bar, the temperature of the mold corresponded to that of Example 1.

Abstract

Es wird ein Verfahren vorgeschlagen, das zur Herstellung von Preßmassen mit weichmagnetischen Eigenschaften dient. Mit diesem Verfahren ist es möglich, preisgünstig Magnetkerne herzustellen, die in gescherten Magnetkreisen mit Wechselmagnetisierung bis zu Frequenzen von 100 kHz eingesetzt werden können. Sie lassen sich mittels der in der Kunststofftechnik üblichen Verfahren aufgrund der Fließfähigkeit der Preßmassen zu kompliziert geformten Bauteilen maßgenau verarbeiten. Das Verfahren besteht darin, daß ein Gemisch aus Sintereisenpulver und Carbonyleisenpulver mit einem duroplastischen Harz in flüssiger Form gemischt, die so hergestellte Preßmasse in eine geheizte Preßform gefüllt und dann gepreßt wird.A method is proposed that is used to produce molding compounds with soft magnetic properties. With this method it is possible to produce inexpensive magnetic cores that can be used in sheared magnetic circuits with alternating magnetization up to frequencies of 100 kHz. Due to the flowability of the molding compounds, they can be processed to complex-shaped components by means of the methods customary in plastics technology. The process consists in that a mixture of sintered iron powder and carbonyl iron powder is mixed with a thermosetting resin in liquid form, the molding compound thus produced is filled into a heated mold and then pressed.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren nach der Gattung des Hauptanspruches. Es sind bereits weichmagnetische kunststoffgebundene Massekerne bekannt, die 95 bis 99,5 Gew.-% Carbonyleisen, Rest organischen Binder enthalten. Abgesehen von dem verhältnismäßig hohen Preis für Carbonyleisen, die derartige Magnete teuer machen, ist auch die Preßmasse infolge des sehr hohen Füllstoffanteils nicht fließfähig und läßt sich daher nicht so einfach und gleichmäßig in komplizierte Formen füllen. Sie muß auch mit Drücken von 5000 bis 18000 bar verdichtet werden. Darüber hinaus ist die mechanische Festigkeit der aus diesen Preßmassen hergestellten Bauteile gering und die Bauteile sind sehr spröde. Schließlich lassen sich die magnetischen Eigenschaften dieser Massekerne nicht in dem gewünschten Umfange an die gegebenen Erfordernisse anpassen.The invention is based on a method according to the preamble of the main claim. Soft magnetic plastic-bonded mass cores are already known which contain 95 to 99.5% by weight of carbonyl iron, the rest of organic binders. Apart from the relatively high price for carbonyl iron, which makes such magnets expensive, the molding compound is also not flowable due to the very high proportion of filler and can therefore not be easily and uniformly filled into complicated shapes. It must also be compressed with pressures from 5000 to 18000 bar. In addition, the mechanical strength of the components made from these molding compounds is low and the components are very brittle. Finally, the magnetic properties of these mass cores cannot be adapted to the given extent to the desired extent.

Es sind weiterhin Kerne aus weichmagnetischem Sinterferrit bekannt. Diese haben jedoch eine geringere magnetische Sättigungspolarisation, eine geringere mechanische Festigkeit und eine höhere Temperaturabhängigkeit der magnetischen Kennwerte. Die Möglichkeiten der Formgebung sind eingeschränkt, sie können nur mit größeren Maßtoleranzen hergestellt werden und lassen sich nur verhältnismäßig schwierig bearbeiten.Cores made of soft magnetic sintered ferrite are also known. However, these have a lower magnetic saturation polarization, a lower mechanical strength and a higher temperature dependence of the magnetic parameters. The design options are limited, they can only be manufactured with larger dimensional tolerances and are relatively difficult to machine.

Schließlich werden derartige Kerne auch aus Transformator-oder Dynamoblech hergestellt. Wegen Wirbelstromverlusten lassen sich diese jedoch nur bis ca. 1 kHz einsetzen. Darüber hinaus sind derartige Kerne auf bestimmte Bauformen begrenzt und erfordern Paketieren, das u.U. kostenaufwendig ist. Dünne Ni-Fe-Legierungsbleche mit einer Blechdicke bis 0,03 mm, die auch für Frequenzen bis 100 kHz einsetzbar sind und auch höhere Permeabilitäten aufweisen, sind teuer und schwer verarbeitbar.Finally, such cores are also made from transformer or dynamo sheet. However, due to eddy current losses, these can only be used up to approx. 1 kHz. In addition, such cores are limited to certain designs and require packaging, which may is expensive. Thin Ni-Fe alloy sheets with a sheet thickness of up to 0.03 mm, which can also be used for frequencies up to 100 kHz and also have higher permeabilities, are expensive and difficult to process.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruches hat demgegenüber den Vorteil, daß sich mit ihm Magnete preisgünstig herstellen lasseri, die in gescherten Magnetkreisen mit Wechselmagnetisierung bis zu Frequenzen von 100 kHz eingesetzt werden können. Aufgrund der Fließfähigkeit der Preßmasse ist es mittels der in der Kunststofftechnik üblichen Verfahren ohne weiteres möglich, kompliziert geformte Bauteile aus der Preßmasse maßgenau herzustellen. Der anzuwendende Preßdruck liegt mit 200 bis 2000 bar gegenüber den obenerwähnten kunststoffgebundenen Massekernen verhältnismäßig niedrig. Durch Variation der Ausgangskomponenten,des Füllstoffes und des Preßdrucks lassen sich die magnetischen Eigenschaften in weitem Umfange an die gegebenen Erfordernisse anpassen. Gegenüber weichmagnetischen Sinterferriten weisen die erfindungsgemäßen Kerne eine höhere magnetische Sättigungspolarisation, bessere mechanische Festigkeitseigenschaften sowie eine geringere Temperaturabhängigkeit der magnetischen Kennwerte auf. Die Möglichkeiten der Formgebung sind weiter gesteckt, die Kerne können mit engeren Maßtolerenzan hergestellt werden und lassen sich, wenn nötig, leichter bearbeiten. Darüber hinaus sind die nach dem erfindungsgemäßen Verfahren hergestellten Massekerne bei Kreisen mit Gleichstromvormagnetisierung wegen ihrer höheren Sättigungspolarisation vorteilhafter zu verwenden als die weichmagnetischen Sinterferrite. Gegenüber Kernen aus konventionellem Transformator- oder Dynamoblechen ist vor allem der hohe Frequenzbereich, in dem die nach dem erfindungsgemäßen Verfahren hergestellten Massekerne verwendbar sind, sowie die Möglichkeit, Kerne mit komplizierten Bauformen herzustellen, zu erwähnen.The method according to the invention with the characterizing features of the main claim has the advantage that it can be used to inexpensively produce magnets that can be used in sheared magnetic circuits with alternating magnetization up to frequencies of 100 kHz. Due to the flowability of the molding compound, it is easily possible, using the methods customary in plastics technology, to produce complex-shaped components from the molding compound with dimensional accuracy. The pressure to be applied is relatively low at 200 to 2000 bar compared to the plastic-bonded mass cores mentioned above. By varying the starting components, the filler and the pressure, the magnetic properties can be adapted to the existing requirements to a large extent. Compared to soft magnetic sintered ferrites, the cores according to the invention have a higher magnetic saturation polarization, better mechanical strength properties and a lower temperature dependence of the magnetic parameters. The possibilities of shaping are further extended, the cores can be manufactured with closer dimensional tolerances and can be machined more easily if necessary. In addition, the mass cores produced by the method according to the invention can be used more advantageously in circles with DC bias because of their higher saturation polarization than the soft magnetic sintered ferrites. Compared to cores made from conventional transformer or dynamo sheets, the high frequency range in which the ground cores produced by the method according to the invention can be used and the possibility of producing cores with complicated designs are particularly worth mentioning.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich. So ist es, um Wirbelstromverluste - insbesondere bei großen Teilequerschnitten - bei höheren Frequenzen zu vermindern, besonders vorteilhaft, das Carbonyleisen ganz oder teilweise durch Weichferritpulver zu. ersetzen.Advantageous further developments and improvements of the method specified in the main claim are possible through the measures listed in the subclaims. So it is about vertebrae To reduce power losses - especially in the case of large cross sections - at higher frequencies, it is particularly advantageous to completely or partially remove the carbonyl iron by means of soft ferrite powder. replace.

Beschreibung der ErfindungDescription of the invention Beispiel 1:Example 1:

Ein Gemisch aus einem Eisenpulver, das durch Verdüsung, als Schwamm - oder Elektrolyteisenpulver gewonnen wurde, und 30 Gew.-% Carbonyleisenpulver mit einer mittleren Korngröße von vorzugsweise 90 jum werden mit etwa 50 Vol.-% eines flüssigen Polyesterharzes gemischt, in eine auf ca. 100 °C aufgeheizte Preßfbrm gebracht und mit einem Druck von 1000 bar ca. 40 Sekunden lang gepreßt. Dabei wird das überschüssige Polyesterharz durch die Spalte der Preßform ausgepreßt, wobei die Spalte eine Weite aufweisen, die kleiner ist als die mittlere Korngröße des Magnetpulvers, jedoch so groß, daß währ end der Druck-Aufbauzeit von 1 bis 30 Sekunden durch diese Spalte das überschüssige Bindeharz austreten kann. Dieses Auspressen ist wesentlich, da sonst nicht die hohen Füllgrade bei gleichzeitiger Erzielung einer ausreichenden Fließfähigkeit der Preßmasse zu Beginn des Preßvorgangs erreicht werden. Nach dem Abkühlen kann der ausgehärtete Magnetkörper der Form entnommen werden.A mixture of an iron powder, which was obtained by atomization, as a sponge or electrolyte iron powder, and 30% by weight carbonyl iron powder with an average grain size of preferably 90 μm are mixed with about 50% by volume of a liquid polyester resin brought about 100 ° C heated press and pressed at a pressure of 1000 bar for about 40 seconds. The excess polyester resin is pressed out through the column of the mold, the column having a width which is smaller than the average grain size of the magnetic powder, but so large that the excess build-up time from 1 to 30 seconds through this column Binding resin can leak. This squeezing is essential since otherwise the high degrees of filling cannot be achieved while at the same time achieving sufficient flowability of the molding compound at the beginning of the pressing process. After cooling, the hardened magnetic body can be removed from the mold.

Beispiel 2:Example 2:

In der gleichen Weise wird ein Magnetkörper aus einem Gemisch von dem obengenannten Eisenpulver mit 10 Gew.-% Carbonyleisenpulver in ca. 50 Vol.-% Phenolharz hergestellt bei einem Preßdruck von 2000 bar. Die Temperatur der Preßform beträgt in diesem Falle 140 °C.In the same way, a magnetic body is produced from a mixture of the above iron powder with 10% by weight carbonyl iron powder in approx. 50% by volume phenolic resin at a pressure of 2000 bar. The temperature of the mold is 140 ° C in this case.

Beispiel 3:Example 3:

Dieses Beispiel zeigt, daß es auch möglich ist, ganz ohne Carbonyleisenpulver auszukommen. Für dieses Beispiel wurde gesiebtes Eisenpulver der obenbezeichneten Art in 50 Vol.-% Polyester verwendet. Der Preßdruck betrug 500 bar, die Temperatur der Preßform entsprach der des Beispiels 1.This example shows that it is also possible to get by without carbonyl iron powder. For this example, sieved iron powder of the type described above was used in 50% by volume. Polyester used. The pressure was 500 bar, the temperature of the mold corresponded to that of Example 1.

In der angefügten Tabelle sind die Eigenschaften der nach dem erfindungsgemäßen Verfahren hergestellten weichmagnetischen Werkstoffe mit denen der bekannten Werkstoffe verglichen.

Figure imgb0001
In the attached table, the properties of the soft magnetic materials produced by the method according to the invention are compared with those of the known materials.
Figure imgb0001

Claims (9)

1. Verfahren zur Herstellung von Preßmassen mit weichmagnetischen Eigenschaften durch Pressen eines Gemisches aus weichmagnetischem Material und einem Kunstharz als Bindemittel, dadurch gekennzeichnet, daß ein Gemisch aus Eisenpulver, das durch Verdüsung, als Schwamm- oder Elektrolyteisenpulver gewonnen wurde, und Carbonyleisenpulver mit einem duroplastischen Kunstharz in flüssiger Form gemischt, die so hergestellte Preßmasse in eine beheizte Preßform gefüllt und dann gepreßt wird.1. A process for the production of molding compounds with soft magnetic properties by pressing a mixture of soft magnetic material and a synthetic resin as a binder, characterized in that a mixture of iron powder, which was obtained by atomization, as a sponge or electrolyte iron powder, and carbonyl iron powder with a thermosetting synthetic resin mixed in liquid form, the molding compound thus produced is filled into a heated mold and then pressed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das weichmagnetische Material neben Eisenpulver der angegebenen Art 5 bis 50 Gew.-% Carbonyleisenpulver enthält.2. The method according to claim 1, characterized in that the soft magnetic material contains 5 to 50 wt .-% carbonyl iron powder in addition to iron powder of the type specified. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, .daß das Carbonyleisenpulver ganz oder teilweise durch Weichferritpulver ersetzt wird.3. The method according to claim 1 or 2, characterized in that. That the carbonyl iron powder is wholly or partly replaced by soft ferrite powder. 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Eisenpulver eine mittlere Korngröße von 30 bis 150 um aufweist.4. The method according to claim 1 or 2, characterized in that the iron powder has an average grain size of 30 to 150 microns. 5. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Weichferritpulver eine mittlere Korngröße von 10 bis 200 /um aufweist.5. The method according to claim 3, characterized in that the soft ferrite powder has an average grain size of 10 to 200 / um. 6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als duröplastisches Kunstharz Polyesterharz oder Phenolharz verwendet wird.6. The method according to claim 1, characterized in that polyester resin or phenolic resin is used as the thermosetting synthetic resin. 7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Gesamtfüllgrad der Preßmasse 40 bis 60 Vol.-% beträgt.7. The method according to claim 1, characterized in that the total degree of filling of the molding compound is 40 to 60 vol .-%. 8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Preßdruck zwischen 200 und 2000 bar beträgt.8. The method according to claim 1, characterized in that the pressing pressure is between 200 and 2000 bar. 9. Verfahren nach einem der Ansprüche 1 bis 8, gekennzeichnet durch die Verwendung einer Preßform, die Spalte aufweist, deren Weite kleiner ist als die mittlere Korngröße des weichmagnetischen Materials.9. The method according to any one of claims 1 to 8, characterized by the use of a press mold which has gaps whose width is smaller than the average grain size of the soft magnetic material.
EP79100156A 1978-03-22 1979-01-19 Method for the manufacture of compressed masses with soft magnetic properties Expired EP0004272B1 (en)

Applications Claiming Priority (2)

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DE2812445A DE2812445C2 (en) 1978-03-22 1978-03-22 Process for the production of molding compounds with soft magnetic properties
DE2812445 1978-03-22

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EP0004272A2 true EP0004272A2 (en) 1979-10-03
EP0004272A3 EP0004272A3 (en) 1979-10-31
EP0004272B1 EP0004272B1 (en) 1983-10-05

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EP0044592A1 (en) * 1980-07-22 1982-01-27 Koninklijke Philips Electronics N.V. Synthetic resin-bonded electromagnetic component and method of manufacturing same
EP0220321A1 (en) * 1985-04-19 1987-05-06 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Soft magnetic material composition and method of molding the same
EP0354929A1 (en) * 1987-10-30 1990-02-21 R.S. RUFFINI & ASSOCIATES Inductor insert compositions and methods
WO1996019308A1 (en) * 1994-12-19 1996-06-27 Aga Aktiebolag Process including heating and cooling for production of an injection-moulded body
FR2740259A1 (en) * 1995-10-24 1997-04-25 Thomson Csf MIXED MAGNETIC CORE
DE102014211116A1 (en) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH A method of forming a frame core with center legs for an inductive component and a corresponding manufactured frame core

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EP0220321A1 (en) * 1985-04-19 1987-05-06 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Soft magnetic material composition and method of molding the same
EP0220321A4 (en) * 1985-04-19 1988-11-02 Kanegafuchi Chemical Ind Soft magnetic material composition and method of molding the same.
EP0354929A1 (en) * 1987-10-30 1990-02-21 R.S. RUFFINI & ASSOCIATES Inductor insert compositions and methods
EP0354929A4 (en) * 1987-10-30 1990-06-27 Ruffini & Assoc R S Inductor insert compositions and methods.
WO1996019308A1 (en) * 1994-12-19 1996-06-27 Aga Aktiebolag Process including heating and cooling for production of an injection-moulded body
US5989492A (en) * 1994-12-19 1999-11-23 Aga Aktiebolag Process including heating and cooling for production of an injection-moulded body
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US5748013A (en) * 1995-10-24 1998-05-05 Thomson-Csf Combined magnetic core
DE102014211116A1 (en) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH A method of forming a frame core with center legs for an inductive component and a corresponding manufactured frame core
US10170240B2 (en) 2014-06-11 2019-01-01 SUMIDA Components & Modules GmbH Method for forming a frame core having a center leg for an inductive component and frame core produced accordingly

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EP0004272B1 (en) 1983-10-05
DE2812445A1 (en) 1979-10-04
DE2966239D1 (en) 1983-11-10
DE2812445C2 (en) 1983-10-13
EP0004272A3 (en) 1979-10-31
US4320080A (en) 1982-03-16

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