EP0338597A3 - Permanent magnets - Google Patents

Permanent magnets Download PDF

Info

Publication number
EP0338597A3
EP0338597A3 EP19890111005 EP89111005A EP0338597A3 EP 0338597 A3 EP0338597 A3 EP 0338597A3 EP 19890111005 EP19890111005 EP 19890111005 EP 89111005 A EP89111005 A EP 89111005A EP 0338597 A3 EP0338597 A3 EP 0338597A3
Authority
EP
European Patent Office
Prior art keywords
temperature
magnets
mgoe
max
heat treatment
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
EP19890111005
Other languages
German (de)
French (fr)
Other versions
EP0338597B1 (en
EP0338597A2 (en
Inventor
Hitoshi Yamamoto
Masato Sagawa
Setsuo Fujimura
Yutaka Matsuura
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.)
Neomax Co Ltd
Original Assignee
Sumitomo Special Metals Co Ltd
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 JP59036923A external-priority patent/JPS60182104A/en
Priority claimed from JP59036926A external-priority patent/JPH061726B2/en
Priority claimed from JP59036924A external-priority patent/JPS60182105A/en
Priority claimed from JP59036925A external-priority patent/JPS60182106A/en
Application filed by Sumitomo Special Metals Co Ltd filed Critical Sumitomo Special Metals Co Ltd
Priority claimed from EP85102200A external-priority patent/EP0153744B1/en
Publication of EP0338597A2 publication Critical patent/EP0338597A2/en
Publication of EP0338597A3 publication Critical patent/EP0338597A3/en
Application granted granted Critical
Publication of EP0338597B1 publication Critical patent/EP0338597B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0433—Nickel- or cobalt-based alloys
    • C22C1/0441—Alloys based on intermetallic compounds of the type rare earth - Co, Ni
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • 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
    • H01F1/0577—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 sintered

Abstract

Permanent magnet materials, produced according to the following steps:
forming an alloy powder having a mean particle size of 0.3-80 µm and composed of, in atomic percentage, 8-30 % R (provided that R is at least one of rare earth elements including Y), 2-­ 28 % B, and the balance Fe and inevitable impurities,
sintering the formed body at a temperature of 900-1200°C,
subjecting the sintered body to a primary heat treatment at a temperature of 750-1000°C,
then cooling the resultant body to a temperature of no higher than 680°C at a cooling rate of 3-2000°C/min, and
further subjecting the thus cooled body to a secondary heat treatment at a temperature of 480-700°C.
Magnets having an energy product (BH)max of at least 20 MGOe and a coercitive force (iHc) of at least 10 kOe or magnets having an energy product (BH)max of 40 MGOe or more can be obtained by specific compositions.
EP89111005A 1984-02-28 1985-02-27 Permanent magnets Expired - Lifetime EP0338597B1 (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP36926/84 1984-02-28
JP59036923A JPS60182104A (en) 1984-02-28 1984-02-28 Permanent magnet material and manufacture thereof
JP59036926A JPH061726B2 (en) 1984-02-28 1984-02-28 Method of manufacturing permanent magnet material
JP36925/84 1984-02-28
JP36924/84 1984-02-28
JP36923/84 1984-02-28
JP59036924A JPS60182105A (en) 1984-02-28 1984-02-28 Permanent magnet material and manufacture thereof
JP59036925A JPS60182106A (en) 1984-02-28 1984-02-28 Permanent magnet material and manufacture thereof
EP85102200A EP0153744B1 (en) 1984-02-28 1985-02-27 Process for producing permanent magnets

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP85102200.4 Division 1985-02-27
EP85102200A Division EP0153744B1 (en) 1984-02-28 1985-02-27 Process for producing permanent magnets

Publications (3)

Publication Number Publication Date
EP0338597A2 EP0338597A2 (en) 1989-10-25
EP0338597A3 true EP0338597A3 (en) 1991-11-13
EP0338597B1 EP0338597B1 (en) 1995-01-11

Family

ID=27513335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111005A Expired - Lifetime EP0338597B1 (en) 1984-02-28 1985-02-27 Permanent magnets

Country Status (1)

Country Link
EP (1) EP0338597B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308384B (en) * 1995-12-21 1999-09-15 Univ Hull Magnetic materials
ES2164528B1 (en) * 1999-04-27 2003-10-16 Univ Barcelona Autonoma PROCEDURE TO INCREASE THE COERCITIVITY OF A FERROMAGNETIC MATERIAL.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046075A2 (en) * 1980-08-11 1982-02-17 Fujitsu Limited Temperature sensitive magnetisable material
EP0106948A2 (en) * 1982-09-27 1984-05-02 Sumitomo Special Metals Co., Ltd. Permanently magnetizable alloys, magnetic materials and permanent magnets comprising FeBR or (Fe,Co)BR (R=vave earth)
EP0125347A2 (en) * 1983-05-06 1984-11-21 Sumitomo Special Metals Co., Ltd. Isotropic magnets and process for producing same
EP0126179B1 (en) * 1983-05-21 1988-12-14 Sumitomo Special Metals Co., Ltd. Process for producing permanent magnet materials
EP0126802B1 (en) * 1983-05-25 1988-12-14 Sumitomo Special Metals Co., Ltd. Process for producing of a permanent magnet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046075A2 (en) * 1980-08-11 1982-02-17 Fujitsu Limited Temperature sensitive magnetisable material
EP0106948A2 (en) * 1982-09-27 1984-05-02 Sumitomo Special Metals Co., Ltd. Permanently magnetizable alloys, magnetic materials and permanent magnets comprising FeBR or (Fe,Co)BR (R=vave earth)
EP0125347A2 (en) * 1983-05-06 1984-11-21 Sumitomo Special Metals Co., Ltd. Isotropic magnets and process for producing same
EP0126179B1 (en) * 1983-05-21 1988-12-14 Sumitomo Special Metals Co., Ltd. Process for producing permanent magnet materials
EP0126802B1 (en) * 1983-05-25 1988-12-14 Sumitomo Special Metals Co., Ltd. Process for producing of a permanent magnet

Also Published As

Publication number Publication date
EP0338597B1 (en) 1995-01-11
EP0338597A2 (en) 1989-10-25

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