GB484106A - Improvements in magnetic cores and methods of producing them - Google Patents

Improvements in magnetic cores and methods of producing them

Info

Publication number
GB484106A
GB484106A GB29585/36A GB2958536A GB484106A GB 484106 A GB484106 A GB 484106A GB 29585/36 A GB29585/36 A GB 29585/36A GB 2958536 A GB2958536 A GB 2958536A GB 484106 A GB484106 A GB 484106A
Authority
GB
United Kingdom
Prior art keywords
heated
per cent
mixture
oxygen
andalusite
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
GB29585/36A
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric 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 Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Publication of GB484106A publication Critical patent/GB484106A/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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/14—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 soft-magnetic materials metals or alloys
    • H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—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 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)

Abstract

In the manufacture of magnetic cores for loading coils &c. from finely divided magnetic material, colloidal andalusite is employed in the insulating material with a binder, e.g. sodium silicate. The mixture also includes a substance such as ammonium chromate which liberates oxygen on heating. The heating operation takes place after the cores have been pressed, and the oxygen serves to produce an oxide coating on any metallic portions which have been left uncoated or have become exposed. In an example, powdered iron is mixed dry with ,5 per cent by weight of colloidal andalusite, and about 2,6 per cent of an aqueous solution of sodium silicate is added, the mixture being tumbled to dryness and heated to about 150 DEG C. An aqueous solution of ammonium chromate, aluminium chlorate or sodium chlorate representing about ,3 per cent by weight of the powder is added and the mixture again dried and heated. The material is then pressed into rings at a pressure of about 300 tons per sq. inch, and heated for about an hour to a temperature sufficient to liberate oxygen, e.g. about 425 DEG C.
GB29585/36A 1935-12-30 1936-10-30 Improvements in magnetic cores and methods of producing them Expired GB484106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US484106XA 1935-12-30 1935-12-30

Publications (1)

Publication Number Publication Date
GB484106A true GB484106A (en) 1938-05-02

Family

ID=21954416

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29585/36A Expired GB484106A (en) 1935-12-30 1936-10-30 Improvements in magnetic cores and methods of producing them

Country Status (1)

Country Link
GB (1) GB484106A (en)

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