GB1350318A - Method of manufacturing a sintered magnet body having anisotropic permanent magnetic properties - Google Patents

Method of manufacturing a sintered magnet body having anisotropic permanent magnetic properties

Info

Publication number
GB1350318A
GB1350318A GB1567272A GB1567272A GB1350318A GB 1350318 A GB1350318 A GB 1350318A GB 1567272 A GB1567272 A GB 1567272A GB 1567272 A GB1567272 A GB 1567272A GB 1350318 A GB1350318 A GB 1350318A
Authority
GB
United Kingdom
Prior art keywords
alloy
sintered
sintering
april
temperature
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
GB1567272A
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
Priority claimed from NL7104566A external-priority patent/NL7104566A/en
Priority claimed from NL7203267A external-priority patent/NL7203267A/en
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1350318A publication Critical patent/GB1350318A/en
Expired 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
    • 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
    • H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
    • H01F1/0557—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together sintered

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

1350318 Sintered permanent magnets PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 5 April 1972 [6 April 1971 11 March 1972] 15672/72 Heading C7D A sintered anisotropic permanent magnet of the system M-R which includes M 5 R where M is Co with or without Fe, Ni and Cu and R is at least one of Y, Th and the rare earths, is made by orientating the crushed alloy in a magnetic field, optionally compacting the powder, and sintering above the critical temperature i.e. the highest temperature at which the sintered powder still shows ageing. The alloy is prepared and processed under conditions which prevent the oxygen content exceeding a critical value determined by reference to a graph of coercive force against sintering temperature at different oxygen contents. The maximum oxygen content is usually 0À5% and is achieved by wet grinding the alloy in an organic liquid with a boiling point <120‹ C and containing a fatty substance e.g. mineral, vegetable or animal oil as a metal wetting component. The orientated powders may be precompressed e.g. at 0À3KB and then isostatically compacted up to 20KB. Sintering is effected in an inert atmosphere or under vacuum e.g. at 1100‹C.
GB1567272A 1971-04-06 1972-04-05 Method of manufacturing a sintered magnet body having anisotropic permanent magnetic properties Expired GB1350318A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7104566A NL7104566A (en) 1971-04-06 1971-04-06 Anisotropic permanent magnets - by sintering body composed of cpd of cobalt and rare earth, yttrium or thorium
NL7203267A NL7203267A (en) 1972-03-11 1972-03-11 Permanent magnet prepn - using a powder mixture of low oxygen content and high sintering temp

Publications (1)

Publication Number Publication Date
GB1350318A true GB1350318A (en) 1974-04-18

Family

ID=26644642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1567272A Expired GB1350318A (en) 1971-04-06 1972-04-05 Method of manufacturing a sintered magnet body having anisotropic permanent magnetic properties

Country Status (8)

Country Link
US (1) US3785881A (en)
JP (1) JPS5120291B1 (en)
CA (1) CA977658A (en)
CH (1) CH591149A5 (en)
DE (1) DE2215301B2 (en)
FR (1) FR2135156B1 (en)
GB (1) GB1350318A (en)
IT (1) IT952517B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964939A (en) * 1974-12-26 1976-06-22 Bell Telephone Laboratories, Incorporated Bodies including passivated metal particles
US3970485A (en) * 1975-01-20 1976-07-20 Hitachi Magnetics Corporation Binder and lubricant removal from cobalt-rare earth alloys
US4881988A (en) * 1987-11-16 1989-11-21 Rjf International Corporation Novel flexible magnet for use in small dc motors
US5489343A (en) * 1993-01-29 1996-02-06 Hitachi Metals, Ltd. Method for producing R-Fe-B-based, sintered magnet
JP5197669B2 (en) 2010-03-31 2013-05-15 株式会社東芝 Permanent magnet and motor and generator using the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6907499A (en) * 1969-05-14 1970-11-17

Also Published As

Publication number Publication date
CA977658A (en) 1975-11-11
JPS5120291B1 (en) 1976-06-24
DE2215301B2 (en) 1976-07-08
FR2135156A1 (en) 1972-12-15
US3785881A (en) 1974-01-15
DE2215301A1 (en) 1972-10-12
FR2135156B1 (en) 1975-10-24
CH591149A5 (en) 1977-09-15
IT952517B (en) 1973-07-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee