GB870573A - Permanent magnets - Google Patents

Permanent magnets

Info

Publication number
GB870573A
GB870573A GB1140959A GB1140959A GB870573A GB 870573 A GB870573 A GB 870573A GB 1140959 A GB1140959 A GB 1140959A GB 1140959 A GB1140959 A GB 1140959A GB 870573 A GB870573 A GB 870573A
Authority
GB
United Kingdom
Prior art keywords
particles
ferrite
die
matrix material
acetone
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
GB1140959A
Inventor
Walter S Blume
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
Priority to GB1140959A priority Critical patent/GB870573A/en
Publication of GB870573A publication Critical patent/GB870573A/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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles 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)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

870,573. Moulding magnets. LEYMAN CORPORATION. April 3, 1959, No. 11409/59. Class 87(2). [Also in Group XXXV] A magnet is made by suspending ferrite particles in a liquid whose viscosity is not greater than that of water, applying a magnetic field to orientate the particles, separating the liquid from the particles, and causing a matrix material to solidify around the particles. In one method, (Fig. 1) a suspension of ferrite particles in acetone is introduced into a non magnetic die 2 provided with movable punches 3, 4 which act as pole pieces and provide the magnetic field. The punches move together to expel the acetone whilst the field is applied and the remaining mass is removed and impregnated with molten chlorinated naphthalene which on cooling forms a solid matrix. The mass is then subjected to an ionising operation in the die under moderate temperature and pressure and allowed to cool. In a second method a die with a cavity 5, Fig. 3, is utilised, the matrix material being forced through ports 6, 7. A high frequency electrode surrounding the die may be employed to set a matrix material of the thermosetting type. In a further method a co-dispersion of ferrite particles and matrix material, e.g. lead ferrite and polystyrene dispersed in alcohol is compressed in a die in a magnetic field and heated to 400‹F. when the residual alcohol evaporates and the polystyrene softens. The mass is then further compressed and cooled. The ferrite material may be lead, barium or strontium ferrite and may be prepared by specified methods to yield single domain particles having a size between ¢ and 10. The dispersion liquid may be water, alcohol, acetone, benzene, xylene or toluene and the matrix material may be epoxy, acrylic, polyester or phenolic resins, ureaformaldehyde cellulose acetate, polyethylene or metal.
GB1140959A 1959-04-03 1959-04-03 Permanent magnets Expired GB870573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1140959A GB870573A (en) 1959-04-03 1959-04-03 Permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1140959A GB870573A (en) 1959-04-03 1959-04-03 Permanent magnets

Publications (1)

Publication Number Publication Date
GB870573A true GB870573A (en) 1961-06-14

Family

ID=9985685

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1140959A Expired GB870573A (en) 1959-04-03 1959-04-03 Permanent magnets

Country Status (1)

Country Link
GB (1) GB870573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562019A (en) * 1979-02-23 1985-12-31 Inoue-Japax Research Incorporated Method of preparing plastomeric magnetic objects

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562019A (en) * 1979-02-23 1985-12-31 Inoue-Japax Research Incorporated Method of preparing plastomeric magnetic objects

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