EP3572165B1 - Verfahren zur herstellung eines materials für die herstellung von seltenerd-magneten - Google Patents

Verfahren zur herstellung eines materials für die herstellung von seltenerd-magneten Download PDF

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EP3572165B1
EP3572165B1 EP19170743.9A EP19170743A EP3572165B1 EP 3572165 B1 EP3572165 B1 EP 3572165B1 EP 19170743 A EP19170743 A EP 19170743A EP 3572165 B1 EP3572165 B1 EP 3572165B1
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Prior art keywords
powder particles
powdery
rare earth
intermediate product
earth magnets
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German (de)
English (en)
French (fr)
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EP3572165A1 (de
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Frank Winter
Wilhelm Dr. Fernengel
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Netzsch Trockenmahltechnik GmbH
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Netzsch Trockenmahltechnik GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
    • 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
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/065—Spherical particles
    • 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
    • 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
    • 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
    • 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
    • H01F1/0576—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 pressed, e.g. hot working
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • 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

Definitions

  • the present invention relates to a method for producing a starting material for the production of a rare earth magnet and to a method for operating a plant for producing a starting material for the production of rare earth magnets according to the features of the independent claims.
  • a permanent magnet consists of a magnetizable material, for example iron, cobalt or nickel, which maintains a static magnetic field without the need for an electric current flow, unlike electromagnets.
  • a permanent magnet can be created by the action of a magnetic field on ferromagnetic material.
  • rare earth magnet refers to a group of permanent magnets that essentially consist of ferrous metals (iron, cobalt, more rarely nickel) and rare earth metals (in particular neodymium, samarium, praseodymium, dysprosium, terbium, gadolinium). Rare earth magnets are characterized by the fact that they have a high magnetic remanent flux density and therefore a high magnetic energy density.
  • Permanent magnets are made from crystalline powder.
  • the magnetic powder is pressed into a mold in the presence of a strong magnetic field.
  • the crystals align themselves with their preferred magnetization axis in the direction of the magnetic field.
  • the compacts are then sintered.
  • the pulverized components of the powder are bonded together or compacted by heating, but none or at least not all of the starting materials are melted.
  • the pellets are often under increased pressure - heated in such a way that the temperatures remain below the melting temperature of the main components, so that the shape (shape) of the workpiece is retained.
  • Nd-Fe-B neodymium-iron-boron
  • Conventional comminution techniques for example steam jet mills or similar, are generally suitable for producing powdery intermediate products.
  • old magnets are also becoming increasingly important, which are used for the production of a material for the production of rare earth magnets. Magnets can be reused and/or recycled.
  • the old magnets are, for example, magnets that were used in motors or in old electrical appliances or the like and are no longer needed or which do not and/or no longer fully fulfill their desired properties and/or their desired performance. In this respect, the use of old magnets is also referred to as a recycled material.
  • EP 3 131 099 A1 describes a method for producing an alloy powder for the production of rare earth magnets.
  • the alloy powder is first roughly pulverized in a pulverization chamber of a pulverization device, for example using the hydrogen pulverization technique. Undesirable particle sizes are then sieved out before further fine pulverization is carried out.
  • the invention is based on the object of providing a method for producing a starting material for the production of rare earth magnets, through which the sharp corners and edges of the powder particles present in a powdery intermediate product are at least largely reduced in a simple manner and/or be reduced, thereby providing an optimized starting material for the production of improved rare earth magnets.
  • the process for producing a powdery starting material for the production of rare earth magnets itself should be optimized.
  • a system for producing a starting material for the production of rare earth magnets is provided, by means of which the process for producing a starting material for the production of a rare earth magnet can be carried out in a simple manner and through which an optimized starting material for the production of a Rare earth magnets can be provided.
  • At least one magnetic or magnetizable raw material is provided.
  • This can be, for example, an alloy containing rare earth metals.
  • magnetic recycling material can be used, for example old magnets that have been used in motors and/or in old electrical devices and are no longer of any use there.
  • the at least one magnetic or magnetizable raw material or the recycling material is preferably an alloy containing Nd-Fe-B (neodymium-iron-boron) or Nd-Fe-B (neodymium-iron-boron) magnet.
  • the provided magnetic or magnetizable raw material is comminuted, with a powdery intermediate product being formed from the at least one magnetic or magnetizable raw material.
  • a powdery intermediate product being formed from the at least one magnetic or magnetizable raw material. This includes powder particles that have corners and edges. These corners and edges cause magnets that are made from the powdery intermediate material to have a measured magnetic value or a measured value of magnetic energy density that is significantly below a calculated, theoretically expected magnetic value.
  • the comminution of the magnetic or magnetizable raw material is carried out in such a way that the powder particles of the powdery intermediate product formed have a particle size between 2 ⁇ m and 10 ⁇ m, preferably between 3 ⁇ m and 5 ⁇ m.
  • the comminution is carried out in particular by means of a comminution device, for example by means of conventionally known comminution techniques.
  • a first coarse comminution to produce coarse powder with a particle size of approximately 100 ⁇ m to 300 ⁇ m can be carried out, for example, by using mechanical comminution systems and/or by using hydrogen technology.
  • grinding systems for fine grinding such as fluid bed jet mills or similar grinding systems, are used, which are operated in particular under inert gas.
  • the protective gas used is usually nitrogen or argon.
  • the powder particles of the powdery intermediate product are rounded, ie in the further step the corners and edges of the powder particles are rounded and/or reduced and/or largely ground off.
  • the rounded powder particles thus produced have essentially the same size as the angular powder particles of the powdery intermediate product, namely a particle size between 2 ⁇ m and 10 ⁇ m, preferably between 3 ⁇ m and 5 ⁇ m.
  • the system includes a grinding device which is designed to round off the angular, sharp-edged powder particles of the powdery intermediate product.
  • the grinding device includes a receiving space into which the powdery intermediate product is filled. This is now swirled around within the receiving space so that the powder particles rub against each other, whereby the corners and edges are reduced and in particular ground off.
  • the powdery intermediate product is filled into and treated within the grinding device using a protective gas.
  • the powdery intermediate product is processed in the grinding device in particular for a defined time, for example between 30 minutes and two hours, preferably for about one hour.
  • the receiving space of the grinding device is preferably filled to 50% to 99% with powdery intermediate product for the grinding process; in particular, the powdery intermediate product should fill at least 80% of the receiving space.
  • the remaining space within the receiving space of the grinding device is filled by the protective gas used.
  • a conventional grinding device can be modified in such a way that the powdery intermediate product is, on the one hand, vigorously whirled around within the modified grinding device so that the powder particles rub against each other. On the other hand, no further grinding of the powdery intermediate product may take place during the grinding process, which would lead to fresh, sharp fracture edges.
  • This gentle grinding process is achieved according to the invention by operating the grinding device / modified grinding device with a low gas pressure between 0.25 bar and 1.00 bar.
  • the gas pressure must in particular be adjusted in such a way that the powder particles of the powdery intermediate product are largely free to move in the grinding device / modified grinding device, but the energy of the powder particles is not sufficient for further grinding.
  • friction effects occur between the individual powder particles. These friction effects mean that the sharp corners and edges of the powdery intermediate product are clearly rounded, resulting in an optimized powdered product with rounded powder particles.
  • This optimized powdered product can already be used as the first starting material for the production of the first rare earth magnets.
  • the first rare earth magnets produced using the first starting material have significantly better magnetic values and higher magnetic energy densities than magnets made from the powdered intermediate product described above.
  • the optimized powdered product is subjected to a classification process in a further process step in order to remove the fine abrasion particles from the optimized powdered product that arise during the friction of the powder particles within the grinding device.
  • a dynamic classifier or a rapidly rotating classifier can be used as a separating device for classifying the optimized powdery product into a fine fraction, comprising the fine particles, and a coarse fraction, comprising the desired rounded powder particles produced from the magnetic or magnetizable raw material.
  • Experimental data show that the first rare earth magnets produced using rounded powder particles and especially the second rare earth magnets produced using classified rounded powder particles have better magnetic properties and in particular show magnetic values or magnetic energy densities that are closer to the theoretically calculated values.
  • Figure 1 shows a scanning electron micrograph of a conventionally produced rare earth magnet powder and Figure 2 shows, by way of example, schematically illustrated individual particles 2 of such a conventionally produced rare earth magnetic powder 1.
  • the rare earth magnetic powder 1 is produced, for example, by grinding a corresponding raw material.
  • the magnetic or magnetizable raw material can be alloys comprising ferromagnetic metals, for example iron, nickel, cobalt, in particular an alloy of neodymium, iron and boron (NdFeB), or else old magnets or mixtures of rare earth alloys and old magnets.
  • the magnetic or magnetizable raw material is ground, for example, in fluidized bed jet mills or similar grinding systems in such a way that a fine rare earth magnetic powder 1 is produced in which the average particle size (d50 value) of the powder particles 2 is between 2 ⁇ m and 10 ⁇ m, preferably between 3 ⁇ m and 5 ⁇ m.
  • this rare earth magnet powder 1 contains powder particles 2 with sharp corners 3 and edges 4. If this conventionally produced rare earth magnet powder 1 is now used to produce magnets, magnets 5 are created (compare Figure 5 ), whose magnetic values or magnetic energy densities are significantly below the theoretically calculated values.
  • Figure 3 shows a scanning electron micrograph of a second optimized starting material AM2 for the production of rare earth magnets 20 - see also the figure description of Figure 5 - and Figure 4 shows schematically illustrated individual particles 12, 12a, 12b of the second optimized starting material AM 2.
  • the second optimized starting material AM2 is produced in particular by a process as described in connection with Figure 5 is described in detail below.
  • the second optimized starting material AM2 contains in particular powder particles 12 which, in comparison to the powder particles 2 of the rare earth magnetic powder 1, have only a significantly reduced number of rounded corners 13 and rounded edges 14, in particular rounded and / or rounded powder particles 12a or rounded powder particles 12b .
  • Figure 5 shows individual process steps for producing an optimized starting material AM1, AM2, in particular an optimized rare earth magnetic powder 10 or a rare earth magnetic powder further optimized by additional classification, for producing rare earth magnets 19, 20, based on at least one magnetic or magnetizable raw material M.
  • Figure 6 shows schematically a plant 25 for producing a powdered starting material AM2 intended for the production of rare earth magnets 20.
  • At least one magnetic or magnetizable raw material M is provided.
  • the at least one magnetic or magnetizable raw material M is preferably rare earth alloys and/or scrap magnets, in particular Nd-Fe-B alloys and/or Nd-Fe-B scrap magnets.
  • the provided at least one magnetic or magnetizable raw material M is crushed, whereby a powdery intermediate product ZP, in particular a rare earth magnet powder 1 with powder particles 2 with corners 3 and edges 4 according to the Figures 1 and 2 is created.
  • the comminution is carried out by means of a comminution device 30, for example by means of conventionally known comminution techniques.
  • a first coarse comminution to produce coarse powder with a particle size of approximately 100 ⁇ m to 300 ⁇ m can be carried out, for example, by using mechanical comminution systems such as mills 31 and/or by using hydrogen technology.
  • grinding systems for fine grinding such as fluid bed jet mills 32 or similar grinding systems, are used, which are operated in particular under protective gas S.
  • the protective gas used is usually nitrogen or argon.
  • a rare earth magnet powder 1 produced in this way is used, for example, to produce conventional rare earth magnets 5.
  • this rare earth magnetic powder 1 is now filled into a grinding device 40 under protective gas S and then moved in this grinding device 40 under protective gas S for a defined period of time.
  • the powder particles 2 of the rare earth magnetic powder 1 are whirled around within the grinding device 40.
  • the defined time period for this process step is preferably between 0.5 hours and 3 hours, in particular around one hour.
  • the receiving space of the grinding device 40 is not completely filled with rare earth magnetic powder 1.
  • the receiving space is filled such that the rare earth magnetic powder 1 fills between 50% and 99% of the grinding space.
  • the receiving space is filled such that the rare earth magnetic powder 1 fills at least 80% of the receiving space.
  • the remaining 20% of the grinding space is filled with protective gas S.
  • the rare earth magnetic powder 1 is whirled around vigorously, whereby the corners 3 and edges 4 of the powder particles 2 are ground off by mutual friction of the powder particles 2 against each other.
  • no further grinding of the rare earth magnet powder 1 takes place in the grinding device 40, so that no fresh sharp corners 3 and broken edges 4 can arise.
  • the grinding device 40 is operated with a low gas pressure between 0.25 bar and 1.00 bar.
  • the gas pressure must be adjusted in such a way that the intermediate product ZP or rare earth magnetic powder 1 can be whirled around in the grinding device 40 so that the powder particles 2 rub against each other, whereby the corners 3 and edges 4 are rubbed off and rounded powder particles 12 are produced according to Figures 3 and 4
  • the energy of the powder particles 2 and 12 must not be sufficient for further grinding.
  • the conventionally produced rare earth magnet powder 1 is treated in the grinding device 40 until only rounded powder particles 12b remain according to Figure 4 available.
  • the rounding produces an optimized rare earth magnet powder 10, which can now be used as the first starting material AM1 for the production of the first optimized rare earth magnets 19.
  • the optimized rare earth magnet powder 10 contains the rounded powder particles 12 - see also Figures 3 and 4 - but still fine abrasion parts F, which in particular represent the abrasion of the corners 3 and edges 4 of the powder particles 2 of the rare earth magnet powder 1.
  • these fine abrasion parts F are removed in order to produce a further optimized second starting material AM2 for the production of second, further optimized rare earth magnets 20.
  • the fine abrasion parts F are removed by subsequently classifying the first optimized rare earth magnet powder 10 in a separating device 50, for example a rapidly rotating, dynamic classifier 51, so that the second starting material AM2 for the production of second, further optimized rare earth magnets 20 only contains rounded powder particles 12.
  • first optimized rare earth magnets 19 and in particular second further optimized rare earth magnets 20 have magnetic values or magnetic energy densities that are higher than the magnetic values or magnetic energy densities of rare earth magnets 5, which are made from a conventionally manufactured Rare earth magnetic powder 1 can be manufactured.
  • the second rare earth magnets 20 consist of a second optimized starting material AM2 has a magnetic value or a value of the magnetic energy density that clearly approaches a theoretically calculated optimal value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Powder Metallurgy (AREA)
EP19170743.9A 2018-05-24 2019-04-24 Verfahren zur herstellung eines materials für die herstellung von seltenerd-magneten Active EP3572165B1 (de)

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JP2005240094A (ja) * 2004-02-26 2005-09-08 Sumitomo Metal Mining Co Ltd 希土類元素−鉄系磁石粉、その製造方法、および得られるボンド磁石用樹脂組成物とボンド磁石
JP2008042098A (ja) * 2006-08-09 2008-02-21 Daido Electronics Co Ltd ボンド磁石及びその製造方法
DE102006048864A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
RU2525867C1 (ru) * 2013-06-14 2014-08-20 Федеральное государственное бюджетное учреждение науки Ордена Трудового Красного Знамени Институт физики металлов Уральского отделения Российской академии наук (ИФМ УрО РАН) СПОСОБ ПОЛУЧЕНИЯ СПЕЧЕННОГО ВЫСОКОЭНЕРГОЕМКОГО ПОСТОЯННОГО МАГНИТА ИЗ СПЛАВА НА ОСНОВЕ Nd-Fe-B
DE102013220452A1 (de) * 2013-10-10 2015-04-30 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines Permanentmagneten sowie Permanentmagnet und elektrische Maschine mit einem solchen
CN203541530U (zh) * 2013-11-29 2014-04-16 重庆诺泰颜料有限公司 研磨机端部封口装置
EP3131099A4 (en) * 2014-03-27 2017-11-29 Hitachi Metals, Ltd. R-t-b-based alloy powder and method for producing same, and r-t-b-based sintered magnet and method for producing same
CN103990805B (zh) * 2014-05-11 2016-06-22 沈阳中北通磁科技股份有限公司 一种钕铁硼稀土永磁合金的制粉方法和设备

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KR102659637B1 (ko) 2024-04-22
CN110523995B (zh) 2022-08-02
PL3572165T3 (pl) 2024-07-15
DE102018112411A1 (de) 2019-11-28
ES2980985T3 (es) 2024-10-04
CN110523995A (zh) 2019-12-03
JP6858215B2 (ja) 2021-04-14
US20190362892A1 (en) 2019-11-28
EP3572165A1 (de) 2019-11-27
KR20190134486A (ko) 2019-12-04
US11309127B2 (en) 2022-04-19
RU2726948C1 (ru) 2020-07-17

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