EP0549149B1 - Selten-Erden-Verbundmagnet, Material dafür und Herstellungsverfahren eines gebundenen Magneten - Google Patents

Selten-Erden-Verbundmagnet, Material dafür und Herstellungsverfahren eines gebundenen Magneten Download PDF

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Publication number
EP0549149B1
EP0549149B1 EP92310935A EP92310935A EP0549149B1 EP 0549149 B1 EP0549149 B1 EP 0549149B1 EP 92310935 A EP92310935 A EP 92310935A EP 92310935 A EP92310935 A EP 92310935A EP 0549149 B1 EP0549149 B1 EP 0549149B1
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EP
European Patent Office
Prior art keywords
rare
magnetic powder
earth
thermosetting resin
resin
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Expired - Lifetime
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EP92310935A
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English (en)
French (fr)
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EP0549149A1 (de
Inventor
Takashi Furuya
Naoki Nakatsugawa Heim D-205 Hayashi
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Daido Steel Co Ltd
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Daido Steel Co Ltd
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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
    • H01F1/032—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
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0572—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
    • 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
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/0533—Alloys characterised by their composition containing rare earth metals 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
    • H01F1/032—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
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
    • 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
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2

Definitions

  • This invention relates to a rare-earth bonded magnet used widely for industrial products such as automobiles, business machines, domestic electrification machines and sounder machines, and to a material and a method suitable for manufacturing the rare-earth bonded magnet.
  • the rare-earth magnets contain active metals and are easily oxidized. Therefore, the rare-earth magnets of this kind are inferior in their corrosion resistance and heat-resisting properties, especially in an atmosphere at a temperature higher than room temperature.
  • R-Fe-B magnets and R-Fe-N magnets have Fe(iron) for their main element in addition to R(rare-earth metals), and are oxidized more remarkably as compared with Sm-Co magnets. Accordingly, the R-Fe rare-earth magnets have excellent magnetic properties. However, they have serious problems from the view point of their oxidation resistance, their corrosion resistance and their temperature characteristics and heat resistance at a temperature higher than room temperature.
  • sintered magnets are densified by sintering. Therefore, it is possible to improve the heat resistance of sintered magnets considerably by coating the surface of the magnet with, for example, Ni, or resin at the final stage of the magnet manufacturing process.
  • the bonded magnets especially in a magnet manufactured by injection molding using thermoplastic resin such as polyamide resin, it is possible to improve its heat resistance by coating the surface of the magnet in a manner similar to that described above in relation to sintered magnets because the surface of the magnetic powder is covered completely with resin.
  • thermosetting resin for example, epoxy resin
  • metals or the like a binder such as thermosetting resin (for example, epoxy resin), metals or the like, a large number of vacancies exist between the powdered magnet material and the binder.
  • JP-A-1114006 discloses the use of a triazine derivative having a dithiol group, and a heavy metal of a magnetic substance to form an organic film on the surface of a magnetic powder.
  • JP-A-2117105 discloses a method of manufacturing a bonded magnet which comprises adding a condensed aminotriazine phosphate compound to a mixture of polyamide and magnetic powder material.
  • JP-A-2006573 discloses a corrosion resistant coating material containing a mercaptotriazine derivative and a tanic acid or a derivative thereof.
  • This invention is made in view of the aforementioned problems of the prior art. Accordingly, it is an aim of this invention to provide a rare-earth bonded magnet with improved heat-resistance characteristics by preventing the oxidation of the rare-earth magnetic material as much as possible and decreasing the secular change of the magnetic properties at room temperature and higher temperatures.
  • the present invention provides a material for a rare-earth bonded magnet comprising a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting resin, in an amount of not more than 2 wt% based on the weight of the magnetic powder, which includes cyanato (-R-O-C ⁇ N) groups.
  • the present invention also provides a rare-earth bonded magnet prepared by agglomerating a rare-earth magnetic powder coated with a heat resisting addition polymerizable thermosetting resin, in an amount of not more than 2 wt% based on the weight of the magnetic powder, which includes cyanato (-R-O-C ⁇ N) groups together with a binder.
  • the rare-earth magnetic powder is coated with the heat resisting addition polymerizable resin in an amount of from 0.01 to 1.00 wt% based on the weight of the magnetic powder.
  • the rare-earth magnetic powder coated with the heat resisting addition polymerizable thermosetting resin is agglomerated together with a binder and a metallic catalyst comprising an organometallic salt.
  • the present invention further provides a method for manufacturing a rare-earth bonded magnet by compacting a rare-earth magnetic powder together with a binder which comprises coating a surface of said rare-earth magnetic powder with a heat resisting addition polymerizable thermosetting resin which includes cyanato (-R-O-C ⁇ N) groups by adding said thermosetting resin into the rare-earth magnetic powder almost at the same time as addition of the binder, subsequently molding a compact by pressing the rare-earth magnetic powder coated with the thermosetting resin and curing the thermosetting resin in said compact.
  • An organometallic salt as a metallic catalyst may be added together with the binder and the heat resisting addition polymerizable thermosetting resin, and the curing of the thermosetting resin may be carried out at a temperature of not lower than 150°C in a vacuum or in an atmosphere or argon.
  • magnetic powder containing rare-earth metals such as R-Fe, R-Fe-B, R-Fe-N and the like are used as rare-earth magnetic powder.
  • thermosetting resin As the resin to be coated on the surface of the rare-earth magnetic powder, a heat resisting addition polymerizable thermosetting resin is used which includes cyanato groups -R-O-C ⁇ N.
  • the material for the rare-earth bonded magnet according to this, invention comprises rare-earth magnetic powder coated with heat resisting addition polymerizable thermosetting resin which includes cyanato (-R-O-C ⁇ N) groups, together with binder if required.
  • heat resisting addition polymerizable thermosetting resin which includes cyanato (-R-O-C ⁇ N) groups, together with binder if required.
  • Various methods of coating may be employed, such as a method of coating the rare-earth magnetic powder by dipping it into a solution (for example, methyl ethyl ketone may be used as a solvent) containing the heat resisting addition polymerizable thermosetting resin, a method of mixing the rare-earth magnetic powder after adding the heat resisting addition polymerizable thermosetting resin in it, and a method of coating the rare-earth magnetic powder by vaporizing the polymerizable thermosetting resin and depositing it on the surface of the magnetic powder.
  • a solution for example, methyl ethyl ket
  • the rare-earth bonded magnet according to this invention is formed by agglomerating rare-earth magnetic powder using binder, which magnetic powder is coated with heat resisting addition polymerizable thermosetting resin together with binder if required.
  • An epoxy resin may be used as the binder.
  • the magnetic powder is molded (agglomerated) into a compact having the desired shape by forming methods such as compression molding and so on.
  • thermosetting resin added as the binder and the heat resisting addition polymerizable thermosetting resin at a temperature of not lower than 150°C in a non-oxidative atmosphere or in a vacuum.
  • the thermosetting resin used as a binder is hardened, while the heat resisting addition polymerizable thermosetting resin is hardened by heating to form triazine rings therein.
  • the triazine ring is remarkably stable to thermal energy, so that the heat resistance of the resin is improved.
  • thermosetting resin In order to more uniformly coat the heat resisting addition polymerizable thermosetting resin onto the surfaces of the respective particles of the rare-earth magnetic powder, it is desirable to perform the curing at a temperature of not lower than 150°C in a vacuum. This is because the triazine resin is thereby vapourized temporarily and hardened after depositing on the surface of the rare-earth magnetic powder in a very uniform manner.
  • an organometallic salt such as zinc octylate, iron acetylacetonate or the like as a metallic catalyst together with the binder and the heat resisting addition polymerizable thermosetting resin. Namely, it is possible to further reduce the secular change of the magnetic porperties because adhesion between the rare-earth magnetic powder and the heat resisting addition polymerizable thermosetting resin is improved by addition of the organometallic salt as the metallic catalyst, and a firm coating film having heat resistance can be obtained.
  • the rare-earth magnetic powder is coated with the heat resisting addition polymerizable thermosetting resin which includes cyanato (-R-O-C ⁇ N) groups on a surface thereof, and the coated magnetic powder is used in this form. Consequently, it is possible to retard or prevent the oxidation of the magnetic material.
  • the heat resistance of the magnet is improved and the secular change of the rare-earth bonded magnet at room temperature and above is reduced remarkably.
  • rare-earth molten magnetic alloy consisting essentially of 28wt% of Nd - 0.9wt% of B - 5.0wt% of Co - Fe (remainder) on the surface of a copper roll rotating at the peripheral speed of 25m/sec, a ribbon of about 30 ⁇ m in thickness was obtained, and rare-earth magnetic powder was obtained by comminuting the ribbon into a size smaller than 200 ⁇ m. Subsequently, the rare-earth magnetic powder was annealed for 10 minutes at 550°C.
  • thermosetting resin which is a thermosetting resin
  • a heat resisting addition polymerizable thermosetting resin which includes cyanato (-R-O-C ⁇ N) groups was added to the magnetic powder in the respective amounts shown in Table 1.
  • Zinc octylate was further added in some of the samples as a metallic catalyst in an amount as much as 0.0006wt% of the heat resisting polymerisable thermosetting resin as indicated in Table 1.
  • each of the mixed powders was compressed into a compact of 10mm in diameter and 7mm in height, and cured for 1 hour at 170°C in an atmosphere of argon.
  • rare-earth bonded magnets were obtained by polarizing the cured compacts in a pulsed magnetic field of 50k0e, and open flux values of the polarized magnet were measured, respectively.
  • the open flux values were measured again at room temperature after holding the magnets for 1000 hours at 180°C, whereby the rates of decrease of the open flux values, that is the irreversible demagnetizing factors, were obtained.
  • the results of the measurement of the irreversible demagnetizing factors are shown in Table 1.
  • Table 1 Sample Number Triazine resin content (wt%) Irreversible demagnetizing factor (%) Without zinc octylate Addition of zinc octylate Conventional example 1 0 55.0 55.0 2 0.01 38.0 32.5 3 0.05 27.5 20.6 4 0.10 10.8 9.9 Inventive example 5 0.20 9.4 8.4 6 0.30 8.5 7.3 7 0.50 8.2 7.3 8 1.00 8.9 8.2
  • Example No 1 which was not coated with heat resisting polymerizable resin which includes cyanato (-R-O-C ⁇ N) groups on the surface of the rare-earth magnetic powder, the irreversible demagnetizing factor after holding for 1000 hours at 180°C was considerably large.
  • Example Nos 2-8 according to this invention which were coated with a heat resisting resin which includes cyanato (-R-O-C ⁇ N) groups, it was confirmed that the irreversible demagnetizing factor becomes considerably smaller when that resin is coated more than some degree.
  • the irreversible demagnetizing factor becomes smaller when an organometallic salt is added.
  • each of the mixed powders was compressed into a compact of 10mm in diameter and 7mm in height, and the compact was cured for 1 hour at 170°C in a vacuum.
  • the cured compacts were polarized in a pulsed magnetic field of 50 kOe, and open flux values of each of the polarized magnets were measured.
  • the open flux values were measured again at room temperature after holding the magnets for 1000 hours at 180°C, whereby the rates of decrease of the open flux values, that is the irreversible demagnetizing factors were obtained.
  • the results of the measurement of the irreversible demagnetizing factors are shown in Table 2.
  • rare-earth magnetic powder consisting essentially of 31.1wt% of Nd - 1.0wt% of B - Fe (remainder) in the same manner as Example 1, 2.0wt% of epoxy resin as a binder and 0.3wt% of resin which includes cyanato (-R-O-C ⁇ N) groups (the heat resisting addition polymerizable thermosetting resin) were added to the annealed rare-earth magnetic powder, and those components were mixed uniformly.
  • zinc octylate was further added as a metallic catalyst in an amount as much as 0.0006wt% of the content of the resin which includes cyanato (-R-O-C ⁇ N) groups.
  • each of the mixed powders was compressed into a compact of 10mm in diameter and 7mm in height.
  • the compacts were cured for 1 hour at 170°C, either in air, in an atmosphere of argon, or in a vacuum as indicated in Table 3 below.
  • the cured compacts were polarized in a pulsed magnetic field of 50kOe, and open flux values of the polarized magnets were measured, respectively.
  • the rates of decrease of the open flux values that is, the irreversible demagnetizing factors were obtained by measuring the open flux values at room temperature after holding them for 1000 hours at 180 C. The measured results are shown in Table 3.
  • Example Nos 20-22 which contain resin which includes cyanato (-R-O-C ⁇ N) groups but no organometallic salt
  • Example Nos 23-25 which contain resin which includes cyanato (-R-O-C ⁇ N) groups and an organometallic salt
  • the irreversible demagnetizing factor of the magnet cured in a vacuum is smaller than that of magnet cured in the air or an atmosphere of argon, and curing in a vacuum is effective for further improving the heat resistance of the magnet. Furthermore, it has become clear that it is possible to further decrease the irreversible demagnetizing factor by adding an organometallic salt as a metallic catalyst.
  • An ingot having a composition represented by Sm2Fe17 was subjected to a homogenizing treatment by.heating it for 24 hours at a temperature of 1100°C, and grinding mechanically into powder of the size passing 120 mesh. Then, the powder was subjected to nitriding by heating for 5 hours at a temperature of 550°C in an atmosphere of nitrogen.
  • fine rare-earth magnetic powder was obtained by comminuting the nitrided powder into particles of 3 ⁇ m in mean diameter. Subsequently, to the rare-earth magnetic powder was added 2wt% of epoxy resin as a binder, and 0.3wt% of resin which includes cyanato (-R-O-C ⁇ N) groups (the heat resisting addition polymerizable thermosetting resin). In some samples, iron acetylacetone was further added as a metallis catalyst in an amount as much as 0.0015wt% of the resin which includes cyanato (-R-O-C ⁇ N) groups.
  • each of the mixed powders was compressed into a compact of 10mm in a diameter and 7mm in height in a vertical magnetic field of 15kOe, and the compacts were cured for 1 hour at 170°C, either in an atmosphere of argon or in a vacuum as indicated in Table 4.
  • the irreversible demagnetizing factor becomes smaller in the case of performing the curing in a vacuum, and that it is effective to carry out the curing in a vacuum for further improving the heat resistance of the magnet. Additionally, it was also confirmed that it is possible to further decrease the irreversible demagnetizing factor by adding an organometallic salt as a metallic catalyst.
  • the present invention it is possible to prevent the oxidation of the rare-earth magnetic powder which is easily oxidized in itself. Furthermore, the long term (i.e., secular) change of the magnetic properties of the rare-earth bonded magnet at room temperature and at temperatures higher than room temperature becomes smaller. Accordingly, an excellent effect can be obtained since it is possible to provide a rare-earth bonded magnet having improved heat resistance.
  • thermosetting resin is added into the rare-earth magnetic powder before, at the same time, or after the addition of the binder.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Claims (9)

  1. Material für einen gebundenen Seltenerdmagneten, der ein Seltenerd-Magnetpulver enthält, welches mit einem hitzebeständigen Zusatz von polymerisierbarem hitzehärtbarem Harz in einer Menge von nicht mehr als 2 Gew.-% auf der Basis des Gewichts des Magnetspulvers beschichtet ist, das Zyanat(-R-O-C≡N)-Gruppen enthält.
  2. Material nach Anspruch 1, bei welchem das Seltenerd-Magnetpulver mit dem hitzebeständigen Zusatz von polymerisierbarem Harz in einer Menge von 0,01 bis 1,00 Gew.-% auf der Basis des Gewichts des Magnetpulvers beschichtet ist.
  3. Gebundener Seltenerdmagnet, welcher durch Agglomerieren eines Seltenerd-Magnetpulvers hergestellt ist, das mit einem hitzebeständigen Zusatz von polymerisierbarem hitzehärtbarem Harz in einer Menge von nicht mehr als 2 Gew.-% auf der Basis des Gewichts des Magnetpulvers beschichtet ist, das Zyanat(-R-O-C≡N)-Gruppen zusammen mit einem Bindemittel enthält.
  4. Gebundener Seltenerdmagnet nach Anspruch 3, bei welchem das Seltenerd-Magnetpulver mit einem hitzebeständigen Zusatz von polymerisierbarem Harz in einer Menge von 0,01 bis 1,00 Gew.-% auf der Basis des Gewichts des Magnetpulvers beschichtet ist.
  5. Gebundener Seltenerdmagnet nach Anspruch 3, bei welchem das Seltenerd-Magnetpulver mit einem hitzebeständigen Zusatz von polymerisierbarem hitzehärtbarem Harz zusammen mit einem Bindemittel und einem metallischen Katalysator, der aus einem organometallischen Salz besteht, agglomeriert wird.
  6. Verfahren zum Herstellen eines gebundenen Seltenerdmagneten durch Zusammendrücken eines Seltenerd-Magnetpulvers zusammen mit einem Bindemittel, wobei das Verfahren umfaßt: Beschichten einer Oberfläche des Seltenerd-Magnetpulvers mit einem hitzebeständigen Zusatz von polymerisierbarem hitzehärtbarem Harz, das Zyanat(-R-O-C≡N)-Gruppen enthält, in dem das hitzehärtbare Harz in das Seltenerd-Magnetpulver nahezu gleichzeitig mit dem Zugeben des Bindemittels zugegeben wird, sodann Formen eines Preßlings durch Pressen des mit dem hitzehärtbaren Harz beschichteten Seltenerd-Magnetpulvers sowie Aushärten des hitzehärtbaren Harzes in dem Preßling.
  7. Verfahren nach Anspruch 6, bei welchem ein organometallisches Salz als ein metallischer Katalysator zusammen mit dem Bindemittel und dem hitzebeständigen Zusatz von polymerisierbarem hitzehärtbarem Harz in das Seltenerd-Magnetpulver zugegeben wird.
  8. Verfahren nach Anspruch 6 oder 7, bei welchem das Aushärten des hitzehärtbaren Harzes bei einer Temperatur von nicht weniger als 150°C in einer Atmosphäre von Argon durchgeführt wird.
  9. Verfahren nach Anspruch 6 oder 7, bei welchem das Aushärten des hitzehärtbaren Harzes bei einer Temperatur von nicht weniger als 150°C in einem Vakuum durchgeführt wird.
EP92310935A 1991-12-26 1992-12-01 Selten-Erden-Verbundmagnet, Material dafür und Herstellungsverfahren eines gebundenen Magneten Expired - Lifetime EP0549149B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP34503991A JP3160817B2 (ja) 1991-12-26 1991-12-26 希土類ボンド磁石材料，希土類ボンド磁石および希土類ボンド磁石の製造方法
JP345039/91 1991-12-26

Publications (2)

Publication Number Publication Date
EP0549149A1 EP0549149A1 (de) 1993-06-30
EP0549149B1 true EP0549149B1 (de) 1996-02-28

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EP92310935A Expired - Lifetime EP0549149B1 (de) 1991-12-26 1992-12-01 Selten-Erden-Verbundmagnet, Material dafür und Herstellungsverfahren eines gebundenen Magneten

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EP (1) EP0549149B1 (de)
JP (1) JP3160817B2 (de)
AT (1) ATE134792T1 (de)
DE (1) DE69208624T2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5393445A (en) * 1991-12-26 1995-02-28 Daido Tokushuko Kabushiki Kaisha Rare-earth bonded magnet, material and method for manufacturing the same
JP3171558B2 (ja) * 1995-06-30 2001-05-28 株式会社東芝 磁性材料およびボンド磁石
AU4331500A (en) 1999-04-06 2000-10-23 Du Pont Pharmaceuticals Company Pyrazolotriazines as crf antagonists
WO2000059908A2 (en) 1999-04-06 2000-10-12 Du Pont Pharmaceuticals Company Pyrazolopyrimidines as crf antagonists

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ATE134792T1 (de) 1996-03-15
DE69208624T2 (de) 1996-09-19
JPH05175024A (ja) 1993-07-13
JP3160817B2 (ja) 2001-04-25
EP0549149A1 (de) 1993-06-30
DE69208624D1 (de) 1996-04-04

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