GB1415772A - Large grain cobalt-samarium intermetallic permanent magnet material and process - Google Patents

Large grain cobalt-samarium intermetallic permanent magnet material and process

Info

Publication number
GB1415772A
GB1415772A GB1399773A GB1399773A GB1415772A GB 1415772 A GB1415772 A GB 1415772A GB 1399773 A GB1399773 A GB 1399773A GB 1399773 A GB1399773 A GB 1399773A GB 1415772 A GB1415772 A GB 1415772A
Authority
GB
United Kingdom
Prior art keywords
particles
magnetization
samarium
intermetallic
permanent magnet
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
GB1399773A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB1415772A publication Critical patent/GB1415772A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent 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
    • H01F1/0551—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0552—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)

Abstract

1415772 Magnetic particles GENERAL ELECTRIC CO 22 March 1973 [17 April 1972] 13997/73 Heading C7A Particles of Co-Sm 34-38% alloy having a particle size of 50-200Á with good magnetic properties, are produced by (i) casting the alloy melt to give a body having a grain size of 100- 1000Á; (ii) annealing the body at from 900‹ C up to 1200 C for 5 mins, to 24 hours in an inert atmosphere and (iii) comminuting the body to give particles with a size of 50-200Á at least 85% of which are single crystal particles. The order of steps (ii) and (iii) may be reversed. The annealing conditions are such that the particles can show, after magnetization to at least within 10% of full saturation magnetization, at room temperature, a relative magnetization 4#J/Br of at least 50% at a demagnetizing field of -4 bilo-oersteds. The particles may be incorporated in a non-magnetic matrix (e.g. plastic, elastomer, metal or wax) which is solidified under the influence of an orienting field of at least 4 bilo-oersteds.
GB1399773A 1972-04-17 1973-03-22 Large grain cobalt-samarium intermetallic permanent magnet material and process Expired GB1415772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00244424A US3844850A (en) 1972-04-17 1972-04-17 Large grain cobalt-samarium intermetallic permanent magnet material and process

Publications (1)

Publication Number Publication Date
GB1415772A true GB1415772A (en) 1975-11-26

Family

ID=22922710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1399773A Expired GB1415772A (en) 1972-04-17 1973-03-22 Large grain cobalt-samarium intermetallic permanent magnet material and process

Country Status (10)

Country Link
US (1) US3844850A (en)
JP (1) JPS5751244B2 (en)
BE (1) BE798261A (en)
CA (1) CA975997A (en)
DE (1) DE2318929C2 (en)
ES (1) ES413772A1 (en)
FR (1) FR2180895B1 (en)
GB (1) GB1415772A (en)
IT (1) IT982661B (en)
NL (1) NL7304871A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099995A (en) * 1974-07-31 1978-07-11 Bbc Brown, Boveri & Company, Ltd. Copper-hardened permanent-magnet alloy
CH601484A5 (en) * 1974-12-18 1978-07-14 Bbc Brown Boveri & Cie
US4116726A (en) * 1974-12-18 1978-09-26 Bbc Brown, Boveri & Company Limited As-cast permanent magnet Sm-Co-Cu material with iron, produced by annealing and rapid quenching
JPS5379719A (en) * 1976-12-24 1978-07-14 Seiko Instr & Electronics Ltd Rare earth elements cobalt permanent magnetic
JPH01147214A (en) * 1987-12-04 1989-06-08 Matsushita Electric Ind Co Ltd Kerosene stove

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421889A (en) * 1966-01-13 1969-01-14 Us Air Force Magnetic rare earth-cobalt alloys
NL6608335A (en) * 1966-06-16 1967-12-18
US3540945A (en) * 1967-06-05 1970-11-17 Us Air Force Permanent magnets
US3516612A (en) * 1968-02-28 1970-06-23 Gen Electric Sizing of fine particle ferromagnetic materials
US3615914A (en) * 1968-06-21 1971-10-26 Gen Electric Method of stabilizing permanent magnetic material powders
CH519361A (en) * 1968-11-22 1972-02-29 Raytheon Co Process for manufacturing a permanent magnet
DE1936508C3 (en) * 1969-07-18 1983-12-08 General Electric Co., New York, N.Y. Process for stabilizing the coercive force of powder for permanent magnets
US3684591A (en) * 1970-08-24 1972-08-15 Gen Electric Sintered cobalt-rare earth intermetallic product including samarium and cerium and permanent magnets produced therefrom

Also Published As

Publication number Publication date
JPS4919395A (en) 1974-02-20
FR2180895A1 (en) 1973-11-30
DE2318929C2 (en) 1982-09-02
FR2180895B1 (en) 1978-11-03
JPS5751244B2 (en) 1982-11-01
NL7304871A (en) 1973-10-19
BE798261A (en) 1973-08-16
US3844850A (en) 1974-10-29
IT982661B (en) 1974-10-21
CA975997A (en) 1975-10-14
ES413772A1 (en) 1976-01-16
DE2318929A1 (en) 1973-10-31

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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