EP0518890A1 - Verfahren zum herstellen von se-dauermagneten - Google Patents

Verfahren zum herstellen von se-dauermagneten

Info

Publication number
EP0518890A1
EP0518890A1 EP19910904379 EP91904379A EP0518890A1 EP 0518890 A1 EP0518890 A1 EP 0518890A1 EP 19910904379 EP19910904379 EP 19910904379 EP 91904379 A EP91904379 A EP 91904379A EP 0518890 A1 EP0518890 A1 EP 0518890A1
Authority
EP
European Patent Office
Prior art keywords
blanks
wet
magnetic field
magnets
permanent 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.)
Withdrawn
Application number
EP19910904379
Other languages
German (de)
English (en)
French (fr)
Inventor
Sevi Gaiffi
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.)
Magnetfabrik Schramberg & Co GmbH
Original Assignee
Magnetfabrik Schramberg & Co GmbH
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 Magnetfabrik Schramberg & Co GmbH filed Critical Magnetfabrik Schramberg & Co GmbH
Publication of EP0518890A1 publication Critical patent/EP0518890A1/de
Withdrawn legal-status Critical Current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
    • H01F1/0577—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
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • 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
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling

Definitions

  • the invention relates to a process for the manufacture of SE permanent magnets, in which the ground constituents of the underlying alloy are wet-ground in solvents, in which the wet-ground stillage is dried and pressed into blanks with alignment in a magnetic field, in which the blanks are closed
  • Raw magnets are sintered and the permanent magnets made from the raw magnets are magnetized.
  • Such a method is known from EP 0 126 802 B1 and EP 0 177 371 A1.
  • the wet stillage is dried in a drying press in a separate drying process before pressing.
  • a high pressing pressure of about 1 t / cm 2 to 3 t / cm 2 must be applied and the alignment requires a magnetic field of about 0.8 to 1.4 Tesla.
  • the high press pressure requires expensive press devices and dies.
  • the aligned or aligned particles are damaged, for example bent, during pressing, which leads to a deterioration in the magnetic properties.
  • REPLACEMENT LEAF Press pressure and a strong magnetic field are used, which correspond to the above values in the manufacture of SE permanent magnets in the dry pressing process.
  • This object is achieved according to the invention in that the stillage is pressed into blanks in a wet press with alignment in the magnetic field, the pressing pressure being approximately half the pressing pressure required for dry pressing and the magnetic field for aligning approximately 50 to 60% of that for the alignment of dry-pressed blanks used magnetic field, and that the wet pressed and aligned blanks are sintered into raw magnets.
  • 0.2 to 0.3% by weight of distilled water can be added to the mixed constituents of the alloy.
  • the new process has proven itself in SEFeB permanent magnets that use Nd and / or Pr as SE and can also contain cobalt (Co) as an additional component.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)
EP19910904379 1990-03-09 1991-02-28 Verfahren zum herstellen von se-dauermagneten Withdrawn EP0518890A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007534 1990-03-09
DE19904007534 DE4007534C1 (enrdf_load_stackoverflow) 1990-03-09 1990-03-09

Publications (1)

Publication Number Publication Date
EP0518890A1 true EP0518890A1 (de) 1992-12-23

Family

ID=6401822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910904379 Withdrawn EP0518890A1 (de) 1990-03-09 1991-02-28 Verfahren zum herstellen von se-dauermagneten

Country Status (4)

Country Link
EP (1) EP0518890A1 (enrdf_load_stackoverflow)
JP (1) JPH05506750A (enrdf_load_stackoverflow)
DE (1) DE4007534C1 (enrdf_load_stackoverflow)
WO (1) WO1991014272A1 (enrdf_load_stackoverflow)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601875A (en) * 1983-05-25 1986-07-22 Sumitomo Special Metals Co., Ltd. Process for producing magnetic materials
JPS6187825A (ja) * 1984-10-05 1986-05-06 Hitachi Metals Ltd 永久磁石材料の製造方法
JPS61114505A (ja) * 1984-11-09 1986-06-02 Hitachi Metals Ltd 永久磁石の製造方法
JPS61208808A (ja) * 1985-03-13 1986-09-17 Hitachi Metals Ltd 焼結磁石の製造方法
US4911882A (en) * 1989-02-08 1990-03-27 Sps Technologies, Inc. Process for producing permanent magnets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9114272A1 *

Also Published As

Publication number Publication date
DE4007534C1 (enrdf_load_stackoverflow) 1991-08-29
WO1991014272A1 (de) 1991-09-19
JPH05506750A (ja) 1993-09-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19920821

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17Q First examination report despatched

Effective date: 19930114

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19931022