GB1243379A - Anisotropic magnets - Google Patents

Anisotropic magnets

Info

Publication number
GB1243379A
GB1243379A GB52765/69A GB5276569A GB1243379A GB 1243379 A GB1243379 A GB 1243379A GB 52765/69 A GB52765/69 A GB 52765/69A GB 5276569 A GB5276569 A GB 5276569A GB 1243379 A GB1243379 A GB 1243379A
Authority
GB
United Kingdom
Prior art keywords
container
pressure
anisotropic
mass
plungers
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.)
Expired
Application number
GB52765/69A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1243379A publication Critical patent/GB1243379A/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
    • H01F1/06—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 in the form of particles, e.g. powder
    • 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
    • B22F3/02—Compacting only
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • 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
    • H01F41/0273—Imparting anisotropy

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

1,243,379. Permanent magnets; magnetizing; anisotropic magnets. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 28 Oct., 1969 [31 Oct., 1968], No. 52765/69. Headings H1H and H1P. An anisotropic permanent magnet is manufactured by orienting particles of an anisotropic mass of powder of a ferromagnetic element or alloy or of ferrite, by subjecting the mass to external magnetic field, isostatically compressing the mass, and slightly deforming it anisotropically and plastically while maintaining isostatic pressure. An alloy powder has hexagonal crystal structure and composition M 5 R wherein M is Co, or a combination of Co with one or more of Fe, Ni, Cu, and R is one or more of elements yttrium, thorium, and rare earths. Alternatively M is Co and R is Sm. The powder is placed in a rubber bag and oriented in a field of at least 1000 Oe., and compressed under magnetization with pressure of 1-2 kilobars, after which the bag is evacuated and sealed for isostatic densification at, e.g., 8k bars. The bag is removed and the block soldered into a ductile, e.g. lead container, which is hydrostatically and isostatically compressed to, e.g. 20k bars, and deformed anisotropically and plastically, during which a saturating field of, e.g., 30,000 Oe. is applied. The container 10 is placed between two perforated loose dies 8, 9 resting on shoulders 2 of the bore of an hydraulic compression vessel 1 containing petrol, and opposed plungers 4, 6 are operated by rams 5, 7. Pressure on container 10 is exerted by plungers 4, 6 until on raising pressure on plunger 6 the liquid column and both plungers descend, until plunger 6 deforms container 10 between dies 8, 9. Pressure is then released and the container removed and opened.
GB52765/69A 1968-10-31 1969-10-28 Anisotropic magnets Expired GB1243379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6815510A NL6815510A (en) 1968-10-31 1968-10-31

Publications (1)

Publication Number Publication Date
GB1243379A true GB1243379A (en) 1971-08-18

Family

ID=19805046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB52765/69A Expired GB1243379A (en) 1968-10-31 1969-10-28 Anisotropic magnets

Country Status (15)

Country Link
US (1) US3615915A (en)
JP (1) JPS501837B1 (en)
AT (1) AT298207B (en)
BE (1) BE740983A (en)
CA (1) CA929082A (en)
CH (1) CH537083A (en)
DK (1) DK121447B (en)
ES (1) ES372993A1 (en)
FI (1) FI50750C (en)
FR (1) FR2022025A1 (en)
GB (1) GB1243379A (en)
NL (1) NL6815510A (en)
NO (1) NO132450C (en)
SE (1) SE361231B (en)
SU (1) SU436516A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066455A1 (en) 2008-12-12 2010-06-17 Grundfos Management A/S A permanent magnet and a method for manufacturing a permanent magnet

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2110755A5 (en) * 1970-10-29 1972-06-02 Sermag
CH616777A5 (en) * 1975-09-23 1980-04-15 Bbc Brown Boveri & Cie
US4135953A (en) * 1975-09-23 1979-01-23 Bbc Brown, Boveri & Company, Limited Permanent magnet and method of making it
US4104787A (en) * 1977-03-21 1978-08-08 General Motors Corporation Forming curved wafer thin magnets from rare earth-cobalt alloy powders
US4851058A (en) * 1982-09-03 1989-07-25 General Motors Corporation High energy product rare earth-iron magnet alloys
US4975411A (en) * 1987-05-19 1990-12-04 Fonar Corporation Superconductors and methods of making same
US4990493A (en) * 1988-09-06 1991-02-05 General Electric Company Process of making an oriented polycrystal superconductor
US6071357A (en) * 1997-09-26 2000-06-06 Guruswamy; Sivaraman Magnetostrictive composites and process for manufacture by dynamic compaction
US20050001345A1 (en) * 2003-04-04 2005-01-06 Frank Edward A. Method and apparatus for applying a pattern to a molded surface during manufacture
WO2013166687A1 (en) * 2012-05-10 2013-11-14 青岛云路新能源科技有限公司 Method for manufacturing magnetic powder core
CN106493361B (en) * 2016-11-09 2018-08-21 董中天 Film dry bag magnetic field equal static pressure press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066455A1 (en) 2008-12-12 2010-06-17 Grundfos Management A/S A permanent magnet and a method for manufacturing a permanent magnet
EP2374200B1 (en) * 2008-12-12 2016-09-21 Grundfos Management A/S A permanent magnet and a method for manufacturing a permanent magnet

Also Published As

Publication number Publication date
JPS501837B1 (en) 1975-01-21
US3615915A (en) 1971-10-26
DK121447B (en) 1971-10-18
FI50750C (en) 1976-06-10
FR2022025A1 (en) 1970-07-24
NL6815510A (en) 1970-05-04
NO132450C (en) 1975-11-12
ES372993A1 (en) 1972-03-01
AT298207B (en) 1972-04-25
SE361231B (en) 1973-10-22
FI50750B (en) 1976-03-01
CA929082A (en) 1973-06-26
DE1952403A1 (en) 1970-05-06
NO132450B (en) 1975-08-04
CH537083A (en) 1973-05-15
SU436516A3 (en) 1974-07-15
DE1952403B2 (en) 1977-03-03
BE740983A (en) 1970-04-29

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