EP0174735A3 - Hot pressed permanent magnet having high and low coercivity regions - Google Patents

Hot pressed permanent magnet having high and low coercivity regions Download PDF

Info

Publication number
EP0174735A3
EP0174735A3 EP85305656A EP85305656A EP0174735A3 EP 0174735 A3 EP0174735 A3 EP 0174735A3 EP 85305656 A EP85305656 A EP 85305656A EP 85305656 A EP85305656 A EP 85305656A EP 0174735 A3 EP0174735 A3 EP 0174735A3
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
hot pressed
low coercivity
pressed permanent
coercivity regions
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
EP85305656A
Other versions
EP0174735A2 (en
EP0174735B1 (en
Inventor
Robert Weir Lee
Neal Andrew Schaffel
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of EP0174735A2 publication Critical patent/EP0174735A2/en
Publication of EP0174735A3 publication Critical patent/EP0174735A3/en
Application granted granted Critical
Publication of EP0174735B1 publication Critical patent/EP0174735B1/en
Expired legal-status Critical Current

Links

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
    • H01F1/0575—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)
EP19850305656 1984-09-14 1985-08-09 Method of producing a permanent magnet having high and low coercivity regions Expired EP0174735B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65062384A 1984-09-14 1984-09-14
US650623 1984-09-14

Publications (3)

Publication Number Publication Date
EP0174735A2 EP0174735A2 (en) 1986-03-19
EP0174735A3 true EP0174735A3 (en) 1988-01-20
EP0174735B1 EP0174735B1 (en) 1991-09-11

Family

ID=24609632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850305656 Expired EP0174735B1 (en) 1984-09-14 1985-08-09 Method of producing a permanent magnet having high and low coercivity regions

Country Status (7)

Country Link
EP (1) EP0174735B1 (en)
JP (1) JPS6174305A (en)
AU (1) AU580618B2 (en)
BR (1) BR8504369A (en)
CA (1) CA1244322A (en)
DE (1) DE3584061D1 (en)
ES (1) ES8707373A1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1244322A (en) * 1984-09-14 1988-11-08 Robert W. Lee Hot pressed permanent magnet having high and low coercivity regions
US5538565A (en) * 1985-08-13 1996-07-23 Seiko Epson Corporation Rare earth cast alloy permanent magnets and methods of preparation
US6136099A (en) * 1985-08-13 2000-10-24 Seiko Epson Corporation Rare earth-iron series permanent magnets and method of preparation
JP2530641B2 (en) * 1986-03-20 1996-09-04 日立金属株式会社 Magnetically anisotropic bonded magnet, magnetic powder used therefor, and method for producing the same
IT1206056B (en) * 1986-06-20 1989-04-05 Seiko Epson Corp PROCEDURE FOR THE PREPARATION OF PERMANENT MAGNETS AND PRODUCT OBTAINED
KR900006533B1 (en) * 1987-01-06 1990-09-07 히다찌 긴조꾸 가부시끼가이샤 Anisotropic magnetic materials and magnets made with it and making method for it
US4983232A (en) * 1987-01-06 1991-01-08 Hitachi Metals, Ltd. Anisotropic magnetic powder and magnet thereof and method of producing same
EP0302947B1 (en) * 1987-03-02 1994-06-08 Seiko Epson Corporation Rare earth element-iron base permanent magnet and process for its production
US5213631A (en) * 1987-03-02 1993-05-25 Seiko Epson Corporation Rare earth-iron system permanent magnet and process for producing the same
US4888506A (en) * 1987-07-09 1989-12-19 Hitachi Metals, Ltd. Voice coil-type linear motor
JPH07105301B2 (en) * 1987-09-10 1995-11-13 日立金属株式会社 Manufacturing method of magnetic anisotropy Nd-Fe-B magnet material
JPS6472502A (en) * 1987-09-11 1989-03-17 Hitachi Metals Ltd Permanent magnet for accelerating particle beam
US4859410A (en) * 1988-03-24 1989-08-22 General Motors Corporation Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically aligned material
JP3037699B2 (en) * 1988-09-30 2000-04-24 日立金属株式会社 Warm-worked magnet with improved crack resistance and orientation, and method of manufacturing the same
US5098486A (en) * 1989-05-23 1992-03-24 Hitachi Metals, Ltd. Magnetically anisotropic hotworked magnet and method of producing same
US4952251A (en) * 1989-05-23 1990-08-28 Hitachi Metals, Ltd. Magnetically anisotropic hotworked magnet and method of producing same
JP5707934B2 (en) * 2010-12-27 2015-04-30 トヨタ自動車株式会社 Method for manufacturing anisotropic permanent magnet
JP6330438B2 (en) * 2014-04-09 2018-05-30 信越化学工業株式会社 Manufacturing method of rare earth sintered magnet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057194A (en) * 1979-08-03 1981-03-25 Statni Vyzkumny Ustav Material A method of producing a permanent anisotropic magnet
WO1983000264A1 (en) * 1981-07-14 1983-01-20 Eino, Muneyoshi Field composite permanent magnet and method of producing the same
EP0108474A2 (en) * 1982-09-03 1984-05-16 General Motors Corporation RE-TM-B alloys, method for their production and permanent magnets containing such alloys

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592555A (en) * 1982-06-28 1984-01-09 Hitachi Ltd Permanent magnet field dc machine
CA1216623A (en) * 1983-05-09 1987-01-13 John J. Croat Bonded rare earth-iron magnets
CA1244322A (en) * 1984-09-14 1988-11-08 Robert W. Lee Hot pressed permanent magnet having high and low coercivity regions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057194A (en) * 1979-08-03 1981-03-25 Statni Vyzkumny Ustav Material A method of producing a permanent anisotropic magnet
WO1983000264A1 (en) * 1981-07-14 1983-01-20 Eino, Muneyoshi Field composite permanent magnet and method of producing the same
EP0108474A2 (en) * 1982-09-03 1984-05-16 General Motors Corporation RE-TM-B alloys, method for their production and permanent magnets containing such alloys

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 81 (E-238)[1518], 13th April 1984; & JP-A-59 002 555 (HITACHI SEISAKUSHO K.K.) 09-01-1984 *

Also Published As

Publication number Publication date
AU4648785A (en) 1986-03-20
ES8707373A1 (en) 1987-07-16
EP0174735A2 (en) 1986-03-19
JPS6174305A (en) 1986-04-16
AU580618B2 (en) 1989-01-19
DE3584061D1 (en) 1991-10-17
BR8504369A (en) 1986-07-08
EP0174735B1 (en) 1991-09-11
JPH0315806B2 (en) 1991-03-04
CA1244322A (en) 1988-11-08
ES546960A0 (en) 1987-07-16

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