EP0608188B1 - Verfahren zum Schutz von Magnetpudern und verdichte Dauermagneten, Typ Nd-Fe-B, gegen Oxydation und atmospherische Korrosion - Google Patents

Verfahren zum Schutz von Magnetpudern und verdichte Dauermagneten, Typ Nd-Fe-B, gegen Oxydation und atmospherische Korrosion Download PDF

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Publication number
EP0608188B1
EP0608188B1 EP94420016A EP94420016A EP0608188B1 EP 0608188 B1 EP0608188 B1 EP 0608188B1 EP 94420016 A EP94420016 A EP 94420016A EP 94420016 A EP94420016 A EP 94420016A EP 0608188 B1 EP0608188 B1 EP 0608188B1
Authority
EP
European Patent Office
Prior art keywords
fluorine
powders
ppm
atmospheric corrosion
magnets
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.)
Expired - Lifetime
Application number
EP94420016A
Other languages
English (en)
French (fr)
Other versions
EP0608188A1 (de
Inventor
Masato Sagawa
Fernand Vial
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.)
Ugimag SA
Original Assignee
Ugimag SA
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 Ugimag SA filed Critical Ugimag SA
Publication of EP0608188A1 publication Critical patent/EP0608188A1/de
Application granted granted Critical
Publication of EP0608188B1 publication Critical patent/EP0608188B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H01F41/026—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 protecting methods against environmental influences, e.g. oxygen, by surface treatment
    • 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

Definitions

  • the process illustrated here by way of example, consists in introducing during the fine grinding step, for example, into a gas jet mill (jet mill) a mixture N 2 + F 2 , which can contain between 1 and 100 ppm in flight. of fluorine, and preferably between 1 and 10 ppm, with the usual carrier gas flow rates and grinding time for this operation (for example 100 Nm 3 / h of nitrogen under a relative pressure of 0.5 Pa, for 3 h ).
  • a gas jet mill jet mill

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Disintegrating Or Milling (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Claims (4)

  1. Verfahren zum Schutz von magnetischen Pulvern und verdichteten Dauermagneten, die wenigstens eine Seltene Erde, wenigstens ein Übergangsmetall und Bor enthalten, gegen die Oxidation und die Korrosion durch die Atmosphöre,
    dadurch gekennzeichnet,
    daß man Fluor durch ein (Fe2+N2)-Gasgemisch im Lauf der Feinzerkleinerung der Pulver einführt, welches Gasgemisch 1 bis 100 Vol. ppm Fluor enthält.
  2. Verfahren nach dem Anspruch 1,
    dadurch gekennzeichnet,
    daß der Fluorgehalt des Gasgemisches im Bereich von 1 bis 10 ppm liegt.
  3. Nach einem der Ansprüche 1 oder 2 erhaltenes Pulver,
    dadurch gekennzeichnet,
    daß es zwischen 600 und 2000 ppm Fluor enthält.
  4. Verdichteter Dauermagnet, der aus dem Pulver nach einem der Ansprüche 1 oder 2 erhalten wurde,
    dadurch gekennzeichnet,
    daß er zwischen 600 und 2000 ppm Fluor enthält.
EP94420016A 1993-01-22 1994-01-19 Verfahren zum Schutz von Magnetpudern und verdichte Dauermagneten, Typ Nd-Fe-B, gegen Oxydation und atmospherische Korrosion Expired - Lifetime EP0608188B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300840 1993-01-22
FR9300840A FR2700720B1 (fr) 1993-01-22 1993-01-22 Procédé de protection de poudres magnétiques et aimants permanents densifiés type Fe Nd B contre l'oxydation et la corrosion atmosphérique.

Publications (2)

Publication Number Publication Date
EP0608188A1 EP0608188A1 (de) 1994-07-27
EP0608188B1 true EP0608188B1 (de) 1996-10-02

Family

ID=9443427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94420016A Expired - Lifetime EP0608188B1 (de) 1993-01-22 1994-01-19 Verfahren zum Schutz von Magnetpudern und verdichte Dauermagneten, Typ Nd-Fe-B, gegen Oxydation und atmospherische Korrosion

Country Status (10)

Country Link
US (1) US5411603A (de)
EP (1) EP0608188B1 (de)
JP (1) JP3400840B2 (de)
AT (1) ATE143745T1 (de)
CA (1) CA2112868A1 (de)
DE (1) DE69400618T2 (de)
FI (1) FI940318A (de)
FR (1) FR2700720B1 (de)
MX (1) MX9400180A (de)
SI (1) SI9400020A (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6580820B1 (en) 1999-06-09 2003-06-17 Xerox Corporation Digital imaging method and apparatus for detection of document security marks
JP5437544B2 (ja) * 2001-06-11 2014-03-12 株式会社三徳 二次電池用負極の製造法
JP4747562B2 (ja) * 2004-06-25 2011-08-17 株式会社日立製作所 希土類磁石及びその製造方法、並びに磁石モータ
CN1898757B (zh) * 2004-10-19 2010-05-05 信越化学工业株式会社 稀土永磁材料的制备方法
TWI364765B (en) * 2005-03-23 2012-05-21 Shinetsu Chemical Co Rare earth permanent magnet
TWI413137B (zh) * 2005-03-23 2013-10-21 Shinetsu Chemical Co 機能分級式稀土族永久磁鐵
TWI413136B (zh) * 2005-03-23 2013-10-21 Shinetsu Chemical Co 稀土族永久磁體
MY142131A (en) * 2005-03-23 2010-09-30 Shinetsu Chemical Co Functionally graded rare earth permanent magnet
US7955443B2 (en) * 2006-04-14 2011-06-07 Shin-Etsu Chemical Co., Ltd. Method for preparing rare earth permanent magnet material
JP4656323B2 (ja) * 2006-04-14 2011-03-23 信越化学工業株式会社 希土類永久磁石材料の製造方法
JP4840606B2 (ja) 2006-11-17 2011-12-21 信越化学工業株式会社 希土類永久磁石の製造方法
DE102007032406B3 (de) * 2007-07-10 2008-10-23 Gkss-Forschungszentrum Geesthacht Gmbh Herstellung von Legierungen auf Basis von Titanaluminiden
JP2012039017A (ja) * 2010-08-11 2012-02-23 Hitachi Ltd 磁石材料，磁石成形品及び回転機
CN113444982A (zh) * 2020-03-25 2021-09-28 Neo新材料技术（新加坡）私人有限公司 合金粉末及其制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61124502A (ja) * 1984-11-21 1986-06-12 Mitsui Mining & Smelting Co Ltd 安定性金属磁性粉末及びその製造方法
JPH01205502A (ja) * 1988-02-12 1989-08-17 Seiko Epson Corp 希土類・鉄系樹脂結合型磁石

Also Published As

Publication number Publication date
DE69400618T2 (de) 1997-02-27
US5411603A (en) 1995-05-02
ATE143745T1 (de) 1996-10-15
FI940318A0 (fi) 1994-01-21
FR2700720A1 (fr) 1994-07-29
SI9400020A (en) 1994-09-30
JPH07320917A (ja) 1995-12-08
CA2112868A1 (fr) 1994-07-23
EP0608188A1 (de) 1994-07-27
JP3400840B2 (ja) 2003-04-28
MX9400180A (es) 1994-07-29
DE69400618D1 (de) 1996-11-07
FR2700720B1 (fr) 1995-05-05
FI940318A (fi) 1994-07-23

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