EP0608188A1 - 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
EP0608188A1
EP0608188A1 EP94420016A EP94420016A EP0608188A1 EP 0608188 A1 EP0608188 A1 EP 0608188A1 EP 94420016 A EP94420016 A EP 94420016A EP 94420016 A EP94420016 A EP 94420016A EP 0608188 A1 EP0608188 A1 EP 0608188A1
Authority
EP
European Patent Office
Prior art keywords
powders
fluorine
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.)
Granted
Application number
EP94420016A
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English (en)
French (fr)
Other versions
EP0608188B1 (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

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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 present invention relates to a method of protecting magnetic powders and permanent magnets of the transition metal - rare earth metal type against oxidation and atmospheric corrosion by the introduction of gaseous fluorine during the grinding of the powders. It applies more particularly to powders and magnets of the transition metal - rare earth - boron family, where the metal is essentially iron, and the rare earth essentially of neodymium and / or praseodymium.
  • 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
  • the optimum fluorine content of powders and sintered magnets is between 600 and 2000 ppm. Below 600 ppm, the resistance to powder oxidation and to corrosion in a humid atmosphere of the magnets is insufficient; beyond 2000 ppm, densification defects are noted during densification and weaker intrinsic coercive fields.
  • Powders treated with fluorine are more stable with respect to atmospheric oxidation.
  • the flow rate of the F 2 + N 2 gas mixture was controlled by a calibrated nozzle and by the pressure difference upstream and downstream of the nozzle.
  • the powders thus obtained were axially compressed under an axial field of 1.1 T, at a pressure of 1.6 t / cm 2 in cylindrical samples 15 mm in diameter and 12 mm high.
  • densification was obtained by sintering carried out under vacuum at temperatures between 1060 and 1090 ° C for 4 hours.
  • the blanks thus obtained underwent the usual heat treatments of magnetic hardening, adjusted according to the rare earth content.
  • Alloy powders of the initial composition given in Table V were prepared and ground in a gas mill with or without the introduction of fluorine, under conditions analogous to those of Example 1, the fluorine content in the grinding chamber being 1 ppm (in vol.) in nitrogen.
  • the present process has been illustrated in the production range of powders and magnets by sintering these powders of the TR 2 Fe 14 B type enriched with rare earth.
  • these fine powders are obtained from alloy ingots, but they can also be obtained from coarse powders obtained by the so-called reduction-diffusion process.
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
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.
FR9300840 1993-01-22

Publications (2)

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

Cited By (1)

* 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

Families Citing this family (13)

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Publication number Priority date Publication date Assignee Title
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
US8211327B2 (en) * 2004-10-19 2012-07-03 Shin-Etsu Chemical Co., Ltd. Preparation of rare earth permanent magnet material
TWI417906B (zh) * 2005-03-23 2013-12-01 Shinetsu Chemical Co 機能分級式稀土族永久磁鐵
MY141999A (en) 2005-03-23 2010-08-16 Shinetsu Chemical Co Functionally graded rare earth permanent magnet
TWI413136B (zh) * 2005-03-23 2013-10-21 Shinetsu Chemical Co 稀土族永久磁體
MY142024A (en) * 2005-03-23 2010-08-16 Shinetsu Chemical Co 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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01205502A (ja) * 1988-02-12 1989-08-17 Seiko Epson Corp 希土類・鉄系樹脂結合型磁石

Family Cites Families (1)

* 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01205502A (ja) * 1988-02-12 1989-08-17 Seiko Epson Corp 希土類・鉄系樹脂結合型磁石

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J.H.SWISHER ET AL, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 117, no. 4, April 1970 (1970-04-01), MANCHESTER, NEW HAMPSHIRE US, pages 537 - 540 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 509 (E - 846) 15 November 1989 (1989-11-15) *

Cited By (1)

* 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

Also Published As

Publication number Publication date
MX9400180A (es) 1994-07-29
EP0608188B1 (de) 1996-10-02
ATE143745T1 (de) 1996-10-15
CA2112868A1 (fr) 1994-07-23
US5411603A (en) 1995-05-02
DE69400618D1 (de) 1996-11-07
FR2700720B1 (fr) 1995-05-05
FR2700720A1 (fr) 1994-07-29
JPH07320917A (ja) 1995-12-08
FI940318A0 (fi) 1994-01-21
SI9400020A (en) 1994-09-30
JP3400840B2 (ja) 2003-04-28
DE69400618T2 (de) 1997-02-27
FI940318A (fi) 1994-07-23

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