GB403368A - Improvements in or relating to magnetic cores for high frequency inductance coils and transformers - Google Patents

Improvements in or relating to magnetic cores for high frequency inductance coils and transformers

Info

Publication number
GB403368A
GB403368A GB7846/32A GB784632A GB403368A GB 403368 A GB403368 A GB 403368A GB 7846/32 A GB7846/32 A GB 7846/32A GB 784632 A GB784632 A GB 784632A GB 403368 A GB403368 A GB 403368A
Authority
GB
United Kingdom
Prior art keywords
particles
magnetic
binder
iron
insulating
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
GB7846/32A
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.)
Johnson Laboratories Inc
Original Assignee
Johnson Laboratories Inc
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 Johnson Laboratories Inc filed Critical Johnson Laboratories Inc
Publication of GB403368A publication Critical patent/GB403368A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Insulating Of Coils (AREA)

Abstract

A magnetic core material for radio frequency inductance coils and transformers comprises a compressed mass of finely divided magnetic material bound together by an insulating binder, the magnetic particles being fine enough to pass through a 400-mesh sieve and insulated from one another by a solid insulating material in addition to the binder. The magnetic material may be prepared by heating finely-divided pure iron oxides in a stream of hydrogen. The iron particles so prepared should be about 5 microns in size. The iron powder is mixed with an insulating material which does not chemically unite with the iron such as China wood oil varnish or a solution of phenol resin in acetone, dried in air, and subsequently baked so that the particles remain loose, each particle being individually coated. The insulated particles are then mixed with an insulating binder such as phenol resin, natural resin, or synthetic gums, either in dry powdered state or in solution, the amount of binder being such that the compressed core will contain about 10 per cent of inert material. The material is placed in moulds heated to 100 DEG C. and subjected to a pressure of about 5 to 25 tons per sq. in. so as to reduce it to about 0.4 of its initial volume, and is then treated so as to harden the resinous binding material. The moulding pressure may be released prior to the hardening treatment in order to allow slight expansion of the material and separation of the magnetic particles. After removing the mould, the continuity of the outer skin of the core is broken by mechanical or chemical means such as sand-blasting or pickling with acids. Specification 366,475, [Group XL], is referred to.
GB7846/32A 1931-03-16 1932-03-16 Improvements in or relating to magnetic cores for high frequency inductance coils and transformers Expired GB403368A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US403368XA 1931-03-16 1931-03-16

Publications (1)

Publication Number Publication Date
GB403368A true GB403368A (en) 1933-12-18

Family

ID=21910451

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7846/32A Expired GB403368A (en) 1931-03-16 1932-03-16 Improvements in or relating to magnetic cores for high frequency inductance coils and transformers

Country Status (1)

Country Link
GB (1) GB403368A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087781A1 (en) * 1982-02-26 1983-09-07 Kabushiki Kaisha Toshiba Core material
EP0112577A1 (en) * 1982-12-27 1984-07-04 Kabushiki Kaisha Toshiba Magnetic core and method of producing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087781A1 (en) * 1982-02-26 1983-09-07 Kabushiki Kaisha Toshiba Core material
US4502982A (en) * 1982-02-26 1985-03-05 Tokyo Shibaura Denki Kabushiki Kaisha Iron core material
EP0112577A1 (en) * 1982-12-27 1984-07-04 Kabushiki Kaisha Toshiba Magnetic core and method of producing the same
US4543208A (en) * 1982-12-27 1985-09-24 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic core and method of producing the same

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