EP0289680A3 - Permanent magnet and method of producing the same - Google Patents

Permanent magnet and method of producing the same Download PDF

Info

Publication number
EP0289680A3
EP0289680A3 EP87308666A EP87308666A EP0289680A3 EP 0289680 A3 EP0289680 A3 EP 0289680A3 EP 87308666 A EP87308666 A EP 87308666A EP 87308666 A EP87308666 A EP 87308666A EP 0289680 A3 EP0289680 A3 EP 0289680A3
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
producing
same
alloy
ppm
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
EP87308666A
Other versions
EP0289680A2 (en
EP0289680B1 (en
Inventor
Koji Akioka
Osamu Kobayashi
Tatsuya Shimoda
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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
Priority claimed from JP62104623A external-priority patent/JP2725004B2/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of EP0289680A2 publication Critical patent/EP0289680A2/en
Publication of EP0289680A3 publication Critical patent/EP0289680A3/en
Application granted granted Critical
Publication of EP0289680B1 publication Critical patent/EP0289680B1/en
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
    • H01F7/00—Magnets
    • 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

Abstract

A permanent magnet made from an alloy comprising at least one rare earth element, iron and boron characterised in that the average grain diameter of the crystals of the alloy is not more than 150 mu m, the carbon content and the oxygen content of the alloy being not more than 400 ppm and not more than 1000 ppm respectively.
EP87308666A 1987-04-30 1987-09-30 Permanent magnet and method of producing the same Expired - Lifetime EP0289680B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62104623A JP2725004B2 (en) 1986-04-30 1987-04-30 Manufacturing method of permanent magnet
JP104623/87 1987-04-30

Publications (3)

Publication Number Publication Date
EP0289680A2 EP0289680A2 (en) 1988-11-09
EP0289680A3 true EP0289680A3 (en) 1990-06-06
EP0289680B1 EP0289680B1 (en) 1994-06-22

Family

ID=14385570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87308666A Expired - Lifetime EP0289680B1 (en) 1987-04-30 1987-09-30 Permanent magnet and method of producing the same

Country Status (4)

Country Link
EP (1) EP0289680B1 (en)
KR (1) KR930002559B1 (en)
AT (1) ATE107795T1 (en)
DE (1) DE3750136T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6790296B2 (en) * 2000-11-13 2004-09-14 Neomax Co., Ltd. Nanocomposite magnet and method for producing same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175214A2 (en) * 1984-09-14 1986-03-26 Kabushiki Kaisha Toshiba Permanent magnetic alloy and method of manufacturing the same
FR2586323A1 (en) * 1985-08-13 1987-02-20 Seiko Epson Corp Permanent magnet based on rare earths-iron

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247455A (en) * 1985-08-28 1987-03-02 Sumitomo Special Metals Co Ltd Permanent magnet material having high performance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175214A2 (en) * 1984-09-14 1986-03-26 Kabushiki Kaisha Toshiba Permanent magnetic alloy and method of manufacturing the same
FR2586323A1 (en) * 1985-08-13 1987-02-20 Seiko Epson Corp Permanent magnet based on rare earths-iron

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF APPLIED PHYSICS, vol. 57, no. 8, part 2B, April 1985, pages 4106-4108; E.B. BOLTICH et al.: "Magnetic characteristics of R2Fe14B systems prepared with high purity rare earths (R = Ce,Pr,Dy, and Er)" *
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 232 (C-437)[2679], 29th July 1987; & JP-A-62 047 455 (SUMITOMO SPECIAL METALS CO.) 02-03-1987 *

Also Published As

Publication number Publication date
KR930002559B1 (en) 1993-04-03
ATE107795T1 (en) 1994-07-15
EP0289680A2 (en) 1988-11-09
KR880013195A (en) 1988-11-30
DE3750136T2 (en) 1994-10-06
DE3750136D1 (en) 1994-07-28
EP0289680B1 (en) 1994-06-22

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