GB1299157A - Permanent magnet - Google Patents

Permanent magnet

Info

Publication number
GB1299157A
GB1299157A GB42084/70A GB4208470A GB1299157A GB 1299157 A GB1299157 A GB 1299157A GB 42084/70 A GB42084/70 A GB 42084/70A GB 4208470 A GB4208470 A GB 4208470A GB 1299157 A GB1299157 A GB 1299157A
Authority
GB
United Kingdom
Prior art keywords
particles
magnetic
particle size
smco
rare earth
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
GB42084/70A
Inventor
Alden E Ray
Karl Strnat
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.)
Evonik Operations GmbH
Original Assignee
TH Goldschmidt AG
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 TH Goldschmidt AG filed Critical TH Goldschmidt AG
Publication of GB1299157A publication Critical patent/GB1299157A/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/58—Processes of forming magnets

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

1299157 Magnetic composition TH GOLDSCHMIDT AG 2 Sept 1970 [2 Sept 1969] 42084/70 Headings C3B B1L4H BC1 BC33A BL3A BL5X and BA A permanent magnet is made of different-sized magnetically anisotropic particles bonded together, and consisting of (a) a fraction of substantially uniform particle size and a mean particle size of 50-250Á; (b) a fraction of substantially uniform particle size and a mean particle size of 7-50Á and (c) either particles of mean particle size <12Á or a non-magnetic inorganic or organic binder, e.g. a ductile and/or low-melting metal or a polymer. The ratio of the mean particle sizes of (a) to (b) and of (b) to particles (c) each lie between 7 : 1 and 4 : 1, and the proportions by weight of (a), (b) and (c) are chosen to give optimum packing density e.g. (a) : (b) : (c) may be 7 : 3 : 1. Particles (a) may be a precipitation-hardened Co/rare earth metal alloy containing 10-25 atomic per cent rare earth metal, balance Co, or Co and Cu, Fe or Mn. Particles (b) may be an alloy as (a) or a rare earth/ Co 5 compound, e.g. SmCos, PrCos or YCo 5 . Particles (c) may be as (a) or (b) or may be a Ba or Sr ferrite. The magnetic particles may be aligned and bonded by sintering, compaction or by an organic or inorganic binder. The rare earth/cobalt alloys may be tempered by a surface treatment, e.g. immersion in a Ni bath, by an acid treatment or by deposition of tin on the particle surface and diffusion into the particle. In Example (6) SmCo 3.5 Cu 1.5 (149-250Á and 37-53Á) and SmCo 5 (7Á) are mixed, impregnated with acetone and compacted in a mould while in a directional magnetic field. In (7) a pressed block as in (6) is impregnated in vacuo with curable epoxy resin. In (8) the SmCo 5 fraction of (6) is replaced by tin powder, and no liquid is used in the moulding, but the press mould is hammered to facilitate alignment of the magnetic particles. In (9) 3 size fractions of MMCo 3 Cu 2 are mixed, compacted and pressed in a magnetic field. In (10) a magnetic tile is pressed from methyl methacrylate, MMCo 3 Cu 2 , MMCos and barium ferrite. In (11) a mixture of SmCo 3.5 Cu 1.5 , MMCo 3 Cu 2 and PrCo 5 is pressed.
GB42084/70A 1969-09-02 1970-09-02 Permanent magnet Expired GB1299157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1944432A DE1944432C3 (en) 1969-09-02 1969-09-02 Permanent magnet

Publications (1)

Publication Number Publication Date
GB1299157A true GB1299157A (en) 1972-12-06

Family

ID=5744363

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42084/70A Expired GB1299157A (en) 1969-09-02 1970-09-02 Permanent magnet

Country Status (7)

Country Link
US (1) US3677947A (en)
JP (1) JPS4929046B1 (en)
CH (1) CH516217A (en)
DE (1) DE1944432C3 (en)
FR (1) FR2071664A5 (en)
GB (1) GB1299157A (en)
NL (1) NL162502C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238306A (en) * 1989-11-13 1991-05-29 Mitsubishi Electric Corp Highly conductive magnetic material

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849213A (en) * 1966-09-01 1974-11-19 M Baermann Method of producing a molded anisotropic permanent magnet
US3917778A (en) * 1968-04-13 1975-11-04 Tdk Electronics Co Ltd Method for slip casting soft ferromagnetic ferrites
US3755007A (en) * 1971-04-01 1973-08-28 Gen Electric Stabilized permanent magnet comprising a sintered and quenched body of compacted cobalt-rare earth particles
CH577561A5 (en) * 1971-06-15 1976-07-15 Bbc Brown Boveri & Cie
US4028255A (en) * 1973-01-31 1977-06-07 Ici Australia Limited Preparation of polymer composites
US3839101A (en) * 1973-05-24 1974-10-01 Gen Electric Controlled cooling of cobalt-rare earth magnetic alloys
US3900749A (en) * 1974-04-02 1975-08-19 Hmw Industries Permanent magnet generator
JPS5437679B2 (en) * 1974-04-26 1979-11-16
US3998669A (en) * 1974-09-20 1976-12-21 Th. Goldschmidt Ag Permanent magnet on the basis of cobalt-rare earth alloys and method for its production
US4043845A (en) * 1975-11-28 1977-08-23 Raytheon Company Carbon stabilized cobalt-rare earth magnetic materials
JPS5555745Y2 (en) * 1975-12-22 1980-12-24
CA1057801A (en) * 1975-12-25 1979-07-03 Yuji Hayashi Electromagnetically operated switch with a permanent magnet armature
JPS5578505A (en) * 1978-12-08 1980-06-13 Kanetsuu Kogyo Kk Attraction type magnetic device
NL8004200A (en) * 1980-07-22 1982-02-16 Philips Nv PLASTIC-BONDED ELECTROMAGNETIC COMPONENT AND METHOD FOR MANUFACTURING THE SAME
JPS58142916A (en) * 1982-02-18 1983-08-25 Inoue Japax Res Inc Production of friction material
JPS58171802A (en) * 1982-04-02 1983-10-08 Sumitomo Bakelite Co Ltd Ferromagnetic resin compound
JPS58203625A (en) * 1982-05-24 1983-11-28 Toshiba Corp Magnetic recording medium
US4507965A (en) * 1982-09-24 1985-04-02 Columbia Research Laboratories Detector for determining both forces on and positions of a host device
JPS6169866A (en) * 1984-09-12 1986-04-10 Polyplastics Co Composite material composition
US4620872A (en) * 1984-10-18 1986-11-04 Mitsubishi Kinzoku Kabushiki Kaisha Composite target material and process for producing the same
US4810572A (en) * 1986-02-17 1989-03-07 Mitsui Toatsu Chemicals, Inc. Permanent magnet and process for producing the same
US4808224A (en) * 1987-09-25 1989-02-28 Ceracon, Inc. Method of consolidating FeNdB magnets
US4881988A (en) * 1987-11-16 1989-11-21 Rjf International Corporation Novel flexible magnet for use in small dc motors
JPH07101134B2 (en) * 1988-02-02 1995-11-01 株式会社東芝 Heat storage material and low temperature heat storage
US4980340A (en) * 1988-02-22 1990-12-25 Ceracon, Inc. Method of forming superconductor
EP0540504B1 (en) * 1988-02-29 1995-05-31 Matsushita Electric Industrial Co., Ltd. Method for making a resin bonded magnet article
US4975414A (en) * 1989-11-13 1990-12-04 Ceracon, Inc. Rapid production of bulk shapes with improved physical and superconducting properties
JP2816668B2 (en) * 1996-07-04 1998-10-27 愛知製鋼株式会社 Method for manufacturing magnetically anisotropic resin-bonded magnet
US20040086708A1 (en) * 2002-11-04 2004-05-06 General Electric Company High permeability soft magnetic composites
JP2004327669A (en) * 2003-04-24 2004-11-18 Dowa Mining Co Ltd Bonded magnet, and ferrite magnetic powder therefor
JP5589506B2 (en) * 2010-03-31 2014-09-17 株式会社富士通ゼネラル Permanent magnet motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238306A (en) * 1989-11-13 1991-05-29 Mitsubishi Electric Corp Highly conductive magnetic material
GB2238306B (en) * 1989-11-13 1994-01-05 Mitsubishi Electric Corp Highly conductive magnetic material

Also Published As

Publication number Publication date
FR2071664A5 (en) 1971-09-17
DE1944432A1 (en) 1972-02-24
JPS4929046B1 (en) 1974-08-01
NL162502C (en) 1980-05-16
NL7012902A (en) 1971-03-04
DE1944432C3 (en) 1980-03-20
US3677947A (en) 1972-07-18
NL162502B (en) 1979-12-17
DE1944432B2 (en) 1974-05-02
CH516217A (en) 1971-11-30

Similar Documents

Publication Publication Date Title
GB1299157A (en) Permanent magnet
KR870009410A (en) Magnetic anisotropic bond magnets, magnetic powders used in the same, and methods for producing the same
KR950015415A (en) Rare-earth magnetic powder, its permanent magnet and its manufacturing method
CA2139157A1 (en) Powder mixture for use in compaction to produce rare earth iron sintered permanent magnets
EP1030317A3 (en) Quenched thin ribbon of rare earth/iron/boron-based magnet alloy
CA2124395A1 (en) Magnetically anisotropic spherical powder
JPS6325904A (en) Permanent magnet and manufacture of the same and compound for manufacture of the permanent magnet
JPS55132004A (en) Manufacture of rare earth metal and cobalt magnet
NL6717442A (en)
Wallace et al. High energy magnets from PrCo 5
GB1309958A (en) Permanent magnetisable bodies
JPS5511339A (en) Permanent magnet
US3933535A (en) Method for producing large and/or complex permanent magnet structures
GB1307296A (en) Permanent magnets
Falk et al. Recent Developments in the Field of Elongated Single‐Domain Iron and Iron‐Cobalt Permanent Magnets
KR920701999A (en) Corrosion-resistant rare earth-transition metal magnets and manufacturing method thereof
JPS56150153A (en) Permanent magnet alloy
Kim et al. A high performance Nd-Fe-B magnet with improved corrosion resistance
US3432279A (en) Molded magnetic powdered metal
JPS62256411A (en) Permanent magnet with outstanding resistance to oxidation
Chang et al. The influence of sintering aids on the texture and remanence of Nd-Fe-B magnet alloys
GB1350318A (en) Method of manufacturing a sintered magnet body having anisotropic permanent magnetic properties
US3919002A (en) Sintered cobalt-rare earth intermetallic product
GB1392915A (en) Method of manufacturing permanent magnets from a cast cobalt samarium alloy
JPS6414902A (en) Resin-bound type magnet

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee