EP3507039A1 - Procédé de recyclage pour la fabrication de poudre isotrope magnétique - Google Patents

Procédé de recyclage pour la fabrication de poudre isotrope magnétique

Info

Publication number
EP3507039A1
EP3507039A1 EP17764346.7A EP17764346A EP3507039A1 EP 3507039 A1 EP3507039 A1 EP 3507039A1 EP 17764346 A EP17764346 A EP 17764346A EP 3507039 A1 EP3507039 A1 EP 3507039A1
Authority
EP
European Patent Office
Prior art keywords
alloy
hydrogen
powder
polymer
permanent magnet
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.)
Withdrawn
Application number
EP17764346.7A
Other languages
German (de)
English (en)
Inventor
Oliver Diehl
Almut Dirks
Konrad Güth
Eva Brouwer
Hartmut Hibst
Alexandru Lixandru
Alexander Buckow
Roland Gauss
Oliver Gutfleisch
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3507039A1 publication Critical patent/EP3507039A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B22F8/00—Manufacture of articles from scrap or waste metal particles
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • B22F9/023—Hydrogen absorption
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B59/00—Obtaining rare earth metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • H01F1/0573—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 obtained by reduction or by hydrogen decrepitation or embrittlement
    • 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
    • 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
    • B22F2009/001—Making metallic powder or suspensions thereof from scrap particles
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties
    • C22C2202/02—Magnetic
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the present invention relates to recycling processes for producing isotropic, magnetic powder from old magnetic material. Furthermore, the isotropic, magnetic powders prepared therefrom and their use in
  • Permanent magnets in particular in the fields of motors, generators and electrical and electronic applications claimed.
  • old magnets are hardly recycled industrially. On a larger scale, recycling usually takes place only from production residues.
  • the energy and material intensive material recycling is operated, i. Old magnets are added to the hydrometallurgical rare earth metal recovery process. The inherent value of the magnetic alloy is lost as a functional value.
  • This process is also called HD process (Hydrogen Decrepitation).
  • WO 2012/101398 A1 relates to a method for removing one or more rare earth magnets from an arrangement comprising a plurality of rare earth magnets. At this time, the rare earth magnet (s) are exposed to hydrogen gas to cause hydrogen embrittlement of the magnet, thereby producing a particulate rare earth material which is separated from the remainder of the device.
  • WO 2012/072989 A1 describes a process for the recovery of particulate rare earth materials from a multi-part construction comprising a rare earth magnet.
  • the method comprises the steps of treating the multi-part structure with hydrogen gas to cause hydrogen embrittlement of the rare earth magnet and to obtain a particulate rare earth material and separating the particulate rare earth material from the remainder of the multi-part structure.
  • WO 2000/017894 A1 relates to methods for the reuse of permanent magnets comprising the steps of: separating the magnetic material from a composite body under the action of a gaseous material which embrittles the magnetic material by its action, where appropriate before and / or during and / or after the action of the gaseous material Material is a mechanical effect on the composite body, which supports the process of separation and reuse of the recovered magnetic material for the production of brand new permanent magnets.
  • DE 102 55 604 A1 relates to processes for producing an anisotropic magnetic powder, in which a magnet material with anisotropic orientation based on a SE-TM-B alloy with SE as rare earth element including yttrium and TM as transition metal is used as starting material.
  • Hydrogen is generated by a first hydrogenation process under heating under hydrogen pressure.
  • a second hydrogenation process produces a phase transformation which proceeds under hydrogen pressure and an elevated temperature inducing the phase transformation.
  • a mixture with a TM X B phase, in particular Fe 2 B phase is produced and a dehydrogenation process with a reverse phase transformation (HDDR)
  • WO 2012/002774 A2 A relates to a process for the preparation of
  • R-Fe-B based rare earth magnetic powders with special magnetic properties comprises the following steps: coarse grinding of sintered rare earth magnets as a raw material, placing the coarse material in a tube furnace, filling the tube furnace with hydrogen and raising the temperature, performing disproportionation in the same hydrogen atmosphere while further raising the temperature, allowing the material to flow out Hydrogen from the interior of the tube furnace and then removing the remaining hydrogen from the tube by vacuum, with recombination taking place
  • the hitherto known HDDR processes are aimed at the production of anisotropic neodymium-iron-boron powder particles for plastic-bonded magnets.
  • the process conditions for the production of anisotropic particles vary greatly with respect to the proportions of other elements contained in neodymium-iron-boron magnets, such as cobalt and dysprosium.
  • This requires finding suitable process parameters, such as pressure, temperature and time, for each specific alloy composition and dynamic control of these parameters during the process.
  • An anisotropic material having a homogeneous quality can therefore be obtained only from a pure alloy as a starting material.
  • the known methods are less suitable, in particular for economic reasons.
  • a recycling process for producing isotropic magnetic powders comprising the steps of: a) providing a magnetic alloy comprising al) at least one rare earth metal, a2) at least one transition metal and a3) boron; b) hydrogenation of the alloy from step a) in a hydrogen-containing atmosphere at temperatures of 0 to 600 ° C and a hydrogen partial pressure of 10,000 to 15,000,000 Pa, with formation of monocrystalline particles; c) disproportionation of the particles from step b) in a hydrogen-containing atmosphere at temperatures in the range from greater than 600 to
  • step a) desorption of the hydrogen and subsequent recombination to form isotropic powder particles; wherein the alloy provided in step a) is partially or completely recovered magnetic material.
  • the method according to the invention makes it possible, surprisingly, to prepare isotropic powders which are suitable for the direct production of new permanent magnets, wherein neither a matching of the process conditions to the selected starting material nor a dynamic regulation of the process parameters is necessary.
  • the present invention relates to uses of a powder prepared by the process according to the invention, these uses are given in claims 12 to 15.
  • an "isotropic" magnetic powder is a powder without a preferred magnetic direction Since the orientation of the dissimilar domains within the magnetic material is randomly distributed, it can be magnetized in any direction , On the other hand, powders with a preferred magnetic direction are understood.
  • monocrystalline particles are understood to be particles which have a continuous uniform, homogeneous crystal form lattice.
  • microcrystalline powders have a particle diameter of from 100 to 999 ⁇ m, and “nanocrystalline” powders have a diameter of from 1 to 100 nm. These diameters are preferably determined by scanning electron microscopy.
  • a "precursor” in the sense of the present invention is understood to mean the precursor of a permanent magnet, that is to say a material which already has magnetic properties but has not yet fully unfolded them.
  • a "static control” is understood to mean that the process parameters are set at the beginning of a process step and remain constant within the usual fluctuations, but no regulation is made depending on the degree of conversion or the composition of the material to be reacted. which would be the case with a “dynamic regulation”.
  • the alloy provided in step a) absorbs hydrogen and at least partially hydrides are formed under the "disproportionation” after step c) of the process according to the invention further treatment with hydrogen induces a phase transformation.
  • the “desorption” according to step d) according to the method of the invention is meant the removal of the hydrogen, followed by the "recombination", i.
  • the starting material for the process according to the invention is in principle any magnetic alloy which is at least partially derived from used magnetic material and which contains at least one rare earth element (component al), at least one transition metal (component a2) and boron (component a3).
  • the reaction mixture provided in step a) contains presented alloy as components al), a2) and a3) neodymium, iron and boron.
  • the alloy provided in step a) contains the following components:
  • a rare earth metal selected from the group consisting of
  • a transition metal selected from the group consisting of iron, copper, titanium, cobalt and nickel and mixtures thereof, wherein the proportion of the transition metals in total from 62.8 to 71.2 wt .-%, preferably 65.4 to 69, 8 wt .-%, based on the total weight of the alloy and wherein the proportion of the transition metal cobalt in the total weight of the alloy is below 3 wt.%, Preferably below 2 wt.%, Particularly preferably below 1.5 wt .-%; and / or boron, the boron content being from 0.8 to 1.2% by weight, preferably from 0.9 to 1.1% by weight, based on the total weight of the alloy; and or
  • a further preferred embodiment of the method according to the invention provides that the used magnetic material is selected from the group consisting of production committees, magnets from waste products, waste material from the processing of magnets and mixtures thereof.
  • the hydrogenation according to step b) at temperatures of 20 to 400 ° C and preferably from 20 to 200 ° C and a hydrogen partial pressure of 100,000 to 5,000,000 Pa and preferably 100,000 to 1,000,000 Pa carried out.
  • the disproportionation according to step c) is carried out at temperatures in the range of greater than 600 to 1000 ° C. and a hydrogen partial pressure of 30 000 to 500 000 Pa.
  • a further preferred embodiment of the method according to the invention provides for static regulation of the temperature and of the hydrogen partial pressure in step c).
  • the desorption of the hydrogen in step d) is carried out by applying a vacuum and / or displacing the hydrogen with an inert gas, the temperature being adjusted to the range from 600 to 1000 ° C. and simultaneously the desorption is carried out for 1 to 3,000 minutes and preferably for 2 to 300 minutes.
  • Suitable inert gases are the noble gases, in particular argon.
  • the powders which can be prepared by the process according to the invention are preferably submicrocrystalline.
  • the powders according to the invention can be used directly for the production of permanent magnets, in particular polymer-bonded permanent magnets.
  • a preferred method of making such permanent magnets involves the following steps: i. Providing at least one powder prepared by a process according to the present invention; ii. Heating the at least one powder from step i) to a temperature of 600 to 750 ° C and compressing the powder at pressures of 90 to 500 MPa to form a precursor; iii. Forming the precursor from step ii. at a temperature of 700 to 850 ° C to a permanent magnet.
  • step ii. at a temperature of 700 to 750 ° C and pressures of 90 to 200 MPa performed.
  • Preferred permanent magnets according to the present invention additionally contain at least one polymer and the permanent magnet is in polymer bound form.
  • polymer-bonded permanent magnets can be produced by a process with the following steps:
  • the polymer for the polymer-bonded permanent magnet is selected from the group consisting of thermosets, preferably epoxy resins or thermoplastics, preferably polyamides such as e.g. PA 6 or PA 12 or polyphenylene sulfides and mixtures thereof, with epoxy resins being preferred.
  • the proportion of the magnetic powder is 75 to 95 wt .-%, preferably 80 to 90 wt .-% of the permanent magnet and the proportion of the polymer 5 to 25 wt.%, Preferably 10 to 20 wt .-% of Permanent magnets, provided that the weight proportions of the powder and of the polymer supplement to 100 wt .-%.
  • the permanent magnets containing a powder producible by a method according to the present invention are preferably used for motors, generators, electrical and electronic applications.
  • Table 1 Composition of the starting material. From the old magnetic material of the composition mentioned in Table 1, 50 g were hydrogenated. For this purpose, the material was exposed for one hour at 50 bar pressure and room temperature to a hydrogen atmosphere. The previously compact and still slightly magnetized metal cuboid was then disintegrated to a no longer magnetized, brittle powder. The hydrogen content of the powder and thus the increase in comparison to the starting material could be measured by comparative hot-extraction techniques on comparable samples.
  • the powder stored after the hydrogenation under argon was again brought into a hydrogen atmosphere, in this case a hydrogen pressure of 1500 mbar was used.
  • the material was heated under this hydrogen atmosphere to a temperature of 780 ° C and this temperature for 30 min. held, then the temperature was increased to 900 ° C and held there for 1 hour.
  • the hydrogen was pumped off to 10 mbar and the temperature was kept at 900 ° C. for a further 90 minutes before the hydrogen was completely pumped off and kept at 900 ° C. for a further 30 minutes.
  • the material was cooled under vacuum and returned to an argon atmosphere.
  • Figure 1 shows the in two directions (in the direction of the previously applied external Magnetic field and perpendicular thereto) measured hysteresis loop (polarization ⁇ 0 ⁇ in dependence on the applied magnetic field ⁇ 0 ⁇ ). Since the measurement in the two directions shows no difference in contrast to anisotropic magnets, this is an isotropic material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé de recyclage pour la fabrication de poudres isotropes magnétiques, comprenant les étapes suivantes : a) la préparation d'un alliage magnétique comprenant a1) au moins un métal rare, a2) au moins un métal de transition, et a3) du bore ; b) l'hydrogénation de l'alliage préparé à l'étape a) dans une atmosphère contenant de l'hydrogène, à des températures de 0 à 600 °C et à une pression partielle de l'hydrogène de 10 000 à 15 000 000 Pa, de sorte qu'on obtient des particules monocristallines ; c) la dismutation des particules obtenues à l'étape b) dans une atmosphère contenant de l'hydrogène, à des températures supérieures à 600 et atteignant 1 000 °C et à une pression partielle de l'hydrogène de 30 000 à 1 000 000 Pa ; d) la désorption de l'hydrogène suivie d'une recombinaison, de sorte qu'on obtient des particules de poudre isotropes, l'alliage préparé à l'étape a) étant en partie ou en totalité un matériau magnétique récupéré. L'invention concerne par ailleurs des poudres pouvant être produites par ce procédé et leur utilisation.
EP17764346.7A 2016-08-30 2017-08-28 Procédé de recyclage pour la fabrication de poudre isotrope magnétique Withdrawn EP3507039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016216353.1A DE102016216353A1 (de) 2016-08-30 2016-08-30 Recyclingverfahren zur Herstellung isotroper, magnetischer Pulver
PCT/EP2017/071547 WO2018041776A1 (fr) 2016-08-30 2017-08-28 Procédé de recyclage pour la fabrication de poudre isotrope magnétique

Publications (1)

Publication Number Publication Date
EP3507039A1 true EP3507039A1 (fr) 2019-07-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17764346.7A Withdrawn EP3507039A1 (fr) 2016-08-30 2017-08-28 Procédé de recyclage pour la fabrication de poudre isotrope magnétique

Country Status (3)

Country Link
EP (1) EP3507039A1 (fr)
DE (1) DE102016216353A1 (fr)
WO (1) WO2018041776A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019243136A1 (fr) * 2018-06-18 2019-12-26 Abb Schweiz Ag Procédé de production d'une poudre magnétique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284033B1 (fr) * 1987-03-23 1993-08-11 Tokin Corporation Méthode pour la fabrication d'un aimant anisotrope à liant, à base de terre rare-fer-bore, à partir de copeaux rubanés en alliage terre rare-fer-bore rapidement trempé
DE19843883C1 (de) 1998-09-24 1999-10-07 Vacuumschmelze Gmbh Verfahren zur Wiederverwendung von Dauermagneten
DE10255604B4 (de) 2002-11-28 2006-06-14 Vacuumschmelze Gmbh & Co. Kg Verfahren zum Herstellen eines anisotropen Magnetpulvers und eines gebundenen anisotropen Magneten daraus
KR101219515B1 (ko) 2010-07-02 2013-01-11 한국기계연구원 본드자석용 Ｒ―Ｆｅ―Ｂ계 희토류 자성분말의 제조방법, 이에 의해 제조된 자성분말 및 상기 자성분말을 이용한 본드자석의 제조방법, 이에 의해 제조된 본드자석
GB2486175A (en) 2010-12-02 2012-06-13 Univ Birmingham Separating rare earth magnetic materials from electronic devices
GB201101201D0 (en) 2011-01-24 2011-03-09 Univ Birmingham Magnet recovery method
KR20130030896A (ko) * 2011-09-20 2013-03-28 현대자동차주식회사 희토류분말을 이용한 본드자석 제조방법
DE102013207194A1 (de) * 2012-12-13 2014-06-18 Hyundai Motor Company Verfahren zum Erzeugen eines magnetischen Pulvers und eines Magneten

Also Published As

Publication number Publication date
DE102016216353A1 (de) 2018-03-01
WO2018041776A1 (fr) 2018-03-08

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