GB860220A - Mechanical orientation of magnetically anisotropic particles - Google Patents

Mechanical orientation of magnetically anisotropic particles

Info

Publication number
GB860220A
GB860220A GB21504/59A GB2150459A GB860220A GB 860220 A GB860220 A GB 860220A GB 21504/59 A GB21504/59 A GB 21504/59A GB 2150459 A GB2150459 A GB 2150459A GB 860220 A GB860220 A GB 860220A
Authority
GB
United Kingdom
Prior art keywords
base material
particles
magnetic
barium
rollers
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
GB21504/59A
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.)
Leyman Corp
Original Assignee
Leyman Corp
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 Leyman Corp filed Critical Leyman Corp
Publication of GB860220A publication Critical patent/GB860220A/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
    • H01F1/08—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 pressed, sintered, or bound together
    • H01F1/083—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 pressed, sintered, or bound together in a bonding agent
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

860,220. Magnetic compositions; magnets; magnetizing apparatus. LEYMAN CORPORATION. June 23, 1959 [July 15, 1958], No. 21504/59. Classes 35 and 38 (2). A magnetizable material is made by dispersing fine, magnetically anisotropic particles in a resinous or plastic base material, subjecting the dispersion to a shear stress to align the particles, and hardening or allowing to harden the base material. The magnetic material may be barium, strontium or lead ferrite (e.g. BaFe 12 O 19 ) or single domain iron particles. The base material may be rubber, polyethylene, plasticized p.v.c. or may be a thermosetting material. The shear may be imparted by passing through an orifice or by rolling between rollers 2, 3 which may rotate at different speeds to give a sheet 0.03 inch thick. The sheets so formed may be cut, stacked, compressed, cured and magnetized to form permanent magnets. In an example, barium ferite is formed by firing a mixture of BaCO 3 and Fe 2 O 3 at 1250‹ C. for 1 hour and milled to domain size, i.e. 0.5 Á. This is included in a rubber mixture which contains vulcanizers and accelerators and passed through the rollers. The magnetic powder comprises not more than 70% of the volume of the dispersion. As shown in Fig. 3, strips 40 of uncured material are compressed in a mould 42 between members 43 and heated to cure, the members 43 also acting as polepieces for magnetizing the body.
GB21504/59A 1958-07-15 1959-06-23 Mechanical orientation of magnetically anisotropic particles Expired GB860220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US860220XA 1958-07-15 1958-07-15

Publications (1)

Publication Number Publication Date
GB860220A true GB860220A (en) 1961-02-01

Family

ID=22195676

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21504/59A Expired GB860220A (en) 1958-07-15 1959-06-23 Mechanical orientation of magnetically anisotropic particles

Country Status (1)

Country Link
GB (1) GB860220A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295107B (en) * 1963-01-11 1969-05-14 Westinghouse Electric Corp Pressing device for the production of a hollow cylindrical permanent magnet
DE1696391B1 (en) * 1962-12-11 1969-09-04 Westinghouse Electric Corp Process for the production of a plurality of identical permanent magnet bodies of high anisotropy
US3764539A (en) * 1970-10-14 1973-10-09 Community Building Ass Of Wash Flexible ferrite permanent magnet and methods for its manufacture
GB2133737A (en) * 1983-01-15 1984-08-01 Plessey Co Plc Improvements relating to the manufacture of magnetic sensing optical devices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1696391B1 (en) * 1962-12-11 1969-09-04 Westinghouse Electric Corp Process for the production of a plurality of identical permanent magnet bodies of high anisotropy
DE1295107B (en) * 1963-01-11 1969-05-14 Westinghouse Electric Corp Pressing device for the production of a hollow cylindrical permanent magnet
US3764539A (en) * 1970-10-14 1973-10-09 Community Building Ass Of Wash Flexible ferrite permanent magnet and methods for its manufacture
GB2133737A (en) * 1983-01-15 1984-08-01 Plessey Co Plc Improvements relating to the manufacture of magnetic sensing optical devices

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