DE2115536A1 - Process for the production of permanent magnets - Google Patents

Process for the production of permanent magnets

Info

Publication number
DE2115536A1
DE2115536A1 DE19712115536 DE2115536A DE2115536A1 DE 2115536 A1 DE2115536 A1 DE 2115536A1 DE 19712115536 DE19712115536 DE 19712115536 DE 2115536 A DE2115536 A DE 2115536A DE 2115536 A1 DE2115536 A1 DE 2115536A1
Authority
DE
Germany
Prior art keywords
binder
permanent magnets
heating
production
mixture
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.)
Pending
Application number
DE19712115536
Other languages
German (de)
Inventor
Erich Dr.-Ing. 5300 Bonn. P Steingroever
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.)
Magnetfabrik Bonn GmbH
Original Assignee
Magnetfabrik Bonn 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 Magnetfabrik Bonn GmbH filed Critical Magnetfabrik Bonn GmbH
Priority to DE19712115536 priority Critical patent/DE2115536A1/en
Priority to FR7206919A priority patent/FR2131986B1/fr
Publication of DE2115536A1 publication Critical patent/DE2115536A1/en
Pending legal-status Critical Current

Links

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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/06—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/08—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)

Description

Bonn, den 29. März 1971 Patentanmeldung 2115536Bonn, March 29, 1971 Patent application 2115536

Verfahren zur Herstellung von DauermagnetenProcess for the production of permanent magnets

Die Erfindung betrifft ein Verfahren zur Herstellung von Dauermagneten aus gepulvertem Magnetwerkstoff und einem Bindemittel.The invention relates to a method for manufacturing permanent magnets Made of powdered magnetic material and a binding agent.

Es ist bekannt, Dauermagnete aus gepulvertem Dauermagnetwerkstoff und einem pulverförmigen Bindemittel im Preßverfahren herzustellen. Dabei besteht die Schwierigkeit, daß die Mischung von Magnetpulver und Bindemittel nicht gut rieselfähig ist, so daß ein automatisches Pressen nur schlecht möglich ist? ferner tritt ein Entmischen der beiden Bestandteile der Mischung auf, weil sie verschiedene Korngröße und verschiedene Dichte aufweisen. Zur Abhilfe ist vorgeschlagen worden, das Bindemittel;in ein/Organische! lösungsmittel·* gelöstj-es-fc Magnetwerkstoff^, zuzugeben, dann das lösungsmittel auszutreiben, so daß eine innige Verbindung des Bindemittels mit dem Magnetpulver entsteht. Dieses Naßverfahren bereitet in der Fertigung erhebliche Schwierigkeiten, die insbesondere durch das Austreiben des Lösungsmittels bedingt sind.It is known, permanent magnets made of powdered permanent magnet material and to produce a powdery binder in the pressing process. There is the problem that the mixture of magnetic powder and binder is not free-flowing, so that an automatic Is it difficult to press? furthermore, the two constituents of the mixture separate because they have different grain sizes and have different densities. To remedy this, it has been suggested that the binder; in an / organic! solvent·* dissolved j-es-fc magnetic material ^, add, then drive out the solvent, so that there is an intimate connection between the binder and the magnetic powder. This wet process prepares in manufacturing considerable difficulties, which are caused in particular by driving off the solvent.

Die Erfindung vermeidet diese Nachteile. Sie besteht darin, daß gepulverter Magnetwerkstoff mit einem pulverförmigen Bindemittel gemischt wird, die Mischung erwärmt wird, bis die Teilchen leicht zusammenbacken und nach dem Abkühlen die entstandenen Brocken wieder zerkleinert werden, so daß ein gut rieselfähiges und sich nicht entmischendes Granulat entsteht. Dieses Granulat kann automatisch kalt zu Magnetkörpern gepreßt werden, die anschließend durch Erwärmen zum Aushärten des Bindemittels verfestigt werden.The invention avoids these disadvantages. It consists in that powdered magnetic material is mixed with a powdery binder, the mixture is heated until the particles are light Bake together and after cooling the resulting chunks again be comminuted, so that a free-flowing and non-segregating granulate is formed. These granules can be used automatically cold pressed into magnetic bodies, which are then solidified by heating to harden the binder.

Als Magnetwerkstoff eignet sich besonders ein solcher mit hoher Koerzitivfeidstärke und Remanenz sowie hohem Ausbauchungsfaktor der Entmagnetisierungskurve im zweiten Quadranten, wie zum Beispiel Barium-Strontium-Ferrit oder die bekannten Alnico-Legierungen. Besonders zweckmäßig ist es, als Bindemittel ein Epoxy-Harz zu verwenden. Eine Mischung von solchem Magnetwerkstoff mit mit 2 - 6 Gewichtsprozent Bindemittel backt beim Erwärmen bis auf ca. 60 - 1200C innerhalb 5-20 Min. leicht zusammen, härtet aber noch nicht ganz aus. Sie kann leicht zu einem preßfähigem Granulat zerkleinert werden.A particularly suitable magnetic material is one with a high coercive field strength and remanence as well as a high bulging factor of the demagnetization curve in the second quadrant, such as barium-strontium-ferrite or the known Alnico alloys. It is particularly useful to use an epoxy resin as the binder. A mixture of such a magnetic material with 2 - 6 percent by weight binder bakes on heating to approx. 60 - 120 0 C within 5-20 min slightly, but does not cure even completely. It can easily be crushed into granules that can be pressed.

209 843/024 0 - 2 -209 843/024 0 - 2 -

Es ist bemerkenswert, daß aus diesem Granulat kalt gepreßte Magnetkörper durch das anschließende Erwärmen zum Aushärten des Bindemittels, das zum Beispiel während einer Stunde bei·160° erfolgen kann, ihre Abmessungen nicht oder nur unwesentlich ändern. Mit dem erfindungsgemäßen Verfahren können deshalb sehr maßgenaue Formkörper automatisch auf wirtschaftliche Weise hergestellt werden.It is noteworthy that cold-pressed magnetic bodies are made from this granulate by subsequent heating to harden the binding agent, for example, for one hour at 160 ° can change their dimensions only insignificantly or not at all. With the Processes according to the invention can therefore be produced automatically and economically with very precise dimensions.

209843/02 40209843/02 40

Claims (1)

PatentansprücheClaims Verfahren zur Herstellung von Dauermagneten aus
gepreßtem Magnetwerkstoff und einem Bindemittel,
gekennzeichnet durch:Process for the production of permanent magnets
pressed magnetic material and a binding agent,
marked by: a) Mischen des Magnetpulvers mit dem pulverförmiger Bindemittel}a) Mixing the magnetic powder with the powdery binder} b) Erwärmen» bis die Mischung leicht zusammenbackt}b) Warm up »until the mixture cakes slightly} c) Zerkleinern zu einem preßfähigen Granulat?c) crushing to a pressable granulate? d) Pressen zu Formkörpern;d) pressing into shaped bodies; e) Erwärmen der Formkörper zum Erhärten des
Bindemittels.e) heating the molded body to harden the
Binder. Verfahren nach Anspruch 1, gekennzeichnet durch die Verwendung eines Epoxy-Harzes als Bindemittel.Method according to claim 1, characterized by the Use of an epoxy resin as a binder. Verfahren nach Anspruch 1-2, gekennzeichnet durch Erwärmen der Mischung auf 60 - 120° C während
5-20 Minuten.Method according to claim 1-2, characterized by heating the mixture to 60-120 ° C during
5-20 minutes. Verfahren nach Anspruch 1-5, gekennzeichnet durch Erwärmen der. gepreßten Formkörper auf 120 - 200° C
während 10 Min. - 1 Stunde.Method according to claim 1-5, characterized by heating the. pressed molded body to 120-200 ° C
for 10 min. - 1 hour. Bauermagnet, hergestellt nach dem Anspruch 1-4.Bauermagnet, produced according to claims 1-4. 209843/0240209843/0240
DE19712115536 1971-03-31 1971-03-31 Process for the production of permanent magnets Pending DE2115536A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19712115536 DE2115536A1 (en) 1971-03-31 1971-03-31 Process for the production of permanent magnets
FR7206919A FR2131986B1 (en) 1971-03-31 1972-02-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712115536 DE2115536A1 (en) 1971-03-31 1971-03-31 Process for the production of permanent magnets

Publications (1)

Publication Number Publication Date
DE2115536A1 true DE2115536A1 (en) 1972-10-19

Family

ID=5803336

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712115536 Pending DE2115536A1 (en) 1971-03-31 1971-03-31 Process for the production of permanent magnets

Country Status (2)

Country Link
DE (1) DE2115536A1 (en)
FR (1) FR2131986B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0182010A1 (en) * 1984-11-20 1986-05-28 Kabushiki Kaisha Toshiba Deflecting yoke for electromagnetic deflection type cathod-ray tubes and method for manufacturing it

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0182010A1 (en) * 1984-11-20 1986-05-28 Kabushiki Kaisha Toshiba Deflecting yoke for electromagnetic deflection type cathod-ray tubes and method for manufacturing it
US4620933A (en) * 1984-11-20 1986-11-04 Kabushiki Kaisha Toshiba Deflecting yoke for electromagnetic deflection type cathode-ray tubes and method for manufacturing it

Also Published As

Publication number Publication date
FR2131986B1 (en) 1975-02-21
FR2131986A1 (en) 1972-11-17

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