GB578250A - Improvements in or relating to magnetic dust cores - Google Patents

Improvements in or relating to magnetic dust cores

Info

Publication number
GB578250A
GB578250A GB1640744A GB1640744A GB578250A GB 578250 A GB578250 A GB 578250A GB 1640744 A GB1640744 A GB 1640744A GB 1640744 A GB1640744 A GB 1640744A GB 578250 A GB578250 A GB 578250A
Authority
GB
United Kingdom
Prior art keywords
per cent
class
magnetic dust
powder
magnetic
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
GB1640744A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1640744A priority Critical patent/GB578250A/en
Publication of GB578250A publication Critical patent/GB578250A/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
    • H01F1/26—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 by macromolecular organic substances

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

578,250. Magnetic dust cores. STANDARD TELEPHONES & CABLES, Ltd., and BUCKLEY, S. E. Aug. 29, 1944, No. 16407. [Class 38 (ii)] [Also in Group II] In a magnetic dust core the insulating and binding material consists of a non-reactive mixture of inorganic material with between 1 per cent. and 10 per cent. by weight of a high molecular weight organic material. Inorganic materials named are colloidal clay, magnesium hydroxide, sodium silicate, chromic acid, talc, and kaolin, while suitable organic materials are phenol formaldehyde resin, urea formaldehyde resin, polystyrene, shellac, starch, casein, gelatine, dextrin and glue. In manufacturing the core, talc may be mixed with magnetic powder prepared as described in Specification 564,651, which is then annealed, ground to a powder and mixed with the kaolin and such organic materials as are a powder. Sodium silicate and magnesium hydroxide may be added dissolved and suspended respectively in water, and gelatine may also be added in solution. After the cores have been compressed into shape, they may be heat treated to produce a desired permeability or just baked to dry and given a surface coating. The magnetic dust may be formed from an alloy containing 78 per cent. to 82 per cent. nickel, 16 per cent. to 19 per cent. iron and up to 4 per cent. molybdenum. Specifications 269,510, [Class 37], 269,511, [Class 38 (ii)], 357,537 and 438,803, [Group XXXVI], also are referred to.
GB1640744A 1944-08-29 1944-08-29 Improvements in or relating to magnetic dust cores Expired GB578250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1640744A GB578250A (en) 1944-08-29 1944-08-29 Improvements in or relating to magnetic dust cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1640744A GB578250A (en) 1944-08-29 1944-08-29 Improvements in or relating to magnetic dust cores

Publications (1)

Publication Number Publication Date
GB578250A true GB578250A (en) 1946-06-20

Family

ID=10076762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1640744A Expired GB578250A (en) 1944-08-29 1944-08-29 Improvements in or relating to magnetic dust cores

Country Status (1)

Country Link
GB (1) GB578250A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175535A1 (en) * 1984-09-12 1986-03-26 Polyplastics Co. Ltd. Magnetic composite
CN100429024C (en) * 2006-09-27 2008-10-29 王忠强 Making process of high magnetic permeability iron powder core
CN100453214C (en) * 2006-09-27 2009-01-21 王忠强 Making process of high temperature resistant iron powder core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175535A1 (en) * 1984-09-12 1986-03-26 Polyplastics Co. Ltd. Magnetic composite
CN100429024C (en) * 2006-09-27 2008-10-29 王忠强 Making process of high magnetic permeability iron powder core
CN100453214C (en) * 2006-09-27 2009-01-21 王忠强 Making process of high temperature resistant iron powder core

Similar Documents

Publication Publication Date Title
CN108907069B (en) Ferrous sulfate modified phosphate binder and preparation method thereof
GB951567A (en) Coating compositions for foundry sand moulds or cores
GB782205A (en) Improvements in or relating to sand cores
GB578250A (en) Improvements in or relating to magnetic dust cores
GB1044204A (en) Molding composition and method
ES205711A1 (en) Composite lead chromate-lead silicate pigment
GB713370A (en) Improvements in or relating to ferrite magnetic materials
GB548461A (en) Improvements in or relating to magnetic cores and the production thereof
GB789099A (en) Improvements in or relating to a method of producing magnetic cores
GB620269A (en) Improvements in or relating to magnetic dust cores
GB573780A (en) Improvements in and relating to magnetic cores for transformers
GB679453A (en) Non-metallic magnetic powder and magnetic cores made therefrom
GB568621A (en) Method of preparing foundry sand
GB773338A (en) Improvements in or relating to sand moulds and cores for casting metals
GB285470A (en) A new or improved process for the manufacture of artificial stone
GB703607A (en) Improvements in thin-walled moulds and cores for casting metals
GB541322A (en) Manufacture of magnetic cores
CN115611561A (en) Cement adhesive for high-strength suspension insulator and preparation method thereof
GB692030A (en) Improvements relating to moulding mixtures
GB730178A (en) Improved sand cores and moulds for the casting of metals
GB323533A (en) Improvements in or appertaining to the manufacture of magnetic cores or like magnetic structures
ES238324A1 (en) Composite lead phosphate-lead silicate pigments
GB343620A (en) Improvements in or relating to magnetic cores for use in loading coils and the like
GB688652A (en) Improvements in or relating to refractory moulds for use in the manufacture of cast metal articles
GB321739A (en) Process for the manufacture of ceramic products