GB620269A - Improvements in or relating to magnetic dust cores - Google Patents

Improvements in or relating to magnetic dust cores

Info

Publication number
GB620269A
GB620269A GB125147A GB125147A GB620269A GB 620269 A GB620269 A GB 620269A GB 125147 A GB125147 A GB 125147A GB 125147 A GB125147 A GB 125147A GB 620269 A GB620269 A GB 620269A
Authority
GB
United Kingdom
Prior art keywords
water
per cent
hour
heated
glass
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
GB125147A
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.)
PHILIP RAYMOND BARDELL
General Electric Co PLC
Original Assignee
PHILIP RAYMOND BARDELL
General Electric Co 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 PHILIP RAYMOND BARDELL, General Electric Co PLC filed Critical PHILIP RAYMOND BARDELL
Priority to GB125147A priority Critical patent/GB620269A/en
Publication of GB620269A publication Critical patent/GB620269A/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

Abstract

620,269. Powdered magnetic cores. GENERAL ELECTRIC CO., Ltd., and BARDELL, P. R. Jan. 14, 1947, No. 1251. [Class 38 (ii)] In manufacturing a magnetic dust core, a mixture containing magnetic powder, 1.5 to 3.0 per cent by weight of water-glass and 3.5 to 10.0 per cent by weight of china clay, is heated for at least one hour at 550‹ to 650‹ C., and then shaped under pressure. The china clay and water-glass may be made into a paste with water and methylated spirit in a paddle mixer before mixing with the magnetic powder, which may be a 1:4 nickel-iron alloy. The total mixture is heated for several hours at 150‹ C., then at 550‹ to 650‹ C. for at least one hour, 1 per cent by weight of talc is added, the core is compressed at 50-100 tons/sq. inch into a suitable shape, e.g. an annulus, and then heated for one hour at 570-600‹ C. and cooled at 12-35‹ C. per minute. All the heating may be done in a reducing atmosphere. The cores may be coated with synthetic resin, which is polymerized under heat. A suitable water-glass may contain 54 per cent of total solids comprising silica and sodium oxide in ratio 2: 1. Size analysis of a suitable china clay is given, as also are figures of hysteresis loss.
GB125147A 1947-01-14 1947-01-14 Improvements in or relating to magnetic dust cores Expired GB620269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB125147A GB620269A (en) 1947-01-14 1947-01-14 Improvements in or relating to magnetic dust cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB125147A GB620269A (en) 1947-01-14 1947-01-14 Improvements in or relating to magnetic dust cores

Publications (1)

Publication Number Publication Date
GB620269A true GB620269A (en) 1949-03-22

Family

ID=9718746

Family Applications (1)

Application Number Title Priority Date Filing Date
GB125147A Expired GB620269A (en) 1947-01-14 1947-01-14 Improvements in or relating to magnetic dust cores

Country Status (1)

Country Link
GB (1) GB620269A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015092002A1 (en) * 2013-12-20 2015-06-25 Höganäs Ab (Publ) Soft magnetic powder mix

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015092002A1 (en) * 2013-12-20 2015-06-25 Höganäs Ab (Publ) Soft magnetic powder mix
CN105873697A (en) * 2013-12-20 2016-08-17 霍加纳斯股份有限公司 Soft magnetic powder mix
CN105873697B (en) * 2013-12-20 2019-05-10 霍加纳斯股份有限公司 Soft magnetic powder mixture

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