GB625627A - Improvements in or relating to magnetisable divided bodies or compacts - Google Patents

Improvements in or relating to magnetisable divided bodies or compacts

Info

Publication number
GB625627A
GB625627A GB21337/47A GB2133747A GB625627A GB 625627 A GB625627 A GB 625627A GB 21337/47 A GB21337/47 A GB 21337/47A GB 2133747 A GB2133747 A GB 2133747A GB 625627 A GB625627 A GB 625627A
Authority
GB
United Kingdom
Prior art keywords
flakes
given
shoot
wax
compressed
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
GB21337/47A
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.)
GEOFFREY CHARLES GAUT
NORMAN CLEMENT MORE
Plessey Co Ltd
Original Assignee
GEOFFREY CHARLES GAUT
NORMAN CLEMENT MORE
Plessey Co Ltd
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 GEOFFREY CHARLES GAUT, NORMAN CLEMENT MORE, Plessey Co Ltd filed Critical GEOFFREY CHARLES GAUT
Priority to GB21337/47A priority Critical patent/GB625627A/en
Publication of GB625627A publication Critical patent/GB625627A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

625,627. Making magnetizable bodies. GAUT, G. C., MOORE, N. C., and PLESSEY CO., Ltd. Aug. 6, 1947, No. 21337. Drawings to Specification. [Class 83 (iv)] [Also in Group XXXV] A magnetizable body is formed by compressing together face-to-face, flakes of ferromagnetic material which thereby cohere whether or not a binder is present. Such a body may be used as a core for power or audiofrequency chokes and transformers. A ferromagnetic powder, e.g. of oxide, electrolyticsilicon-, or nickel-iron, of appropriate size selected by screening, is dropped from a hopper on to a vibratory or other feed-shoot which feeds it through rollers by which it is flattened into flakes. The flakes may be annealed and re-rolled several times. A final anneal at 900‹ C..for one to two hours in cracked ammonia or hydrogen is given after mixing the flakes with silica, fused magnesia, zirconia, alumina, thoria or kaolin which prevent sintering together of the flakes, and is fed to mixing conveyer by another shoot. After annealing, the magnetic flakes are separated from the other material in a magnetic separator or a weight classifier, given an oxide coating at 200-250‹ C. in air, and compressed at 15-30 tons/sq. inch in the manner described in Specification 589,863. Before compression a lubricant such as stearic acid in ether may be added. The compressed body may be impregnated with wax or a synthetic resin; e.g. chlorinated naphthalene wax at 150-160‹ C. and varnished, e.g. with phenol formaldehyde type varnish.
GB21337/47A 1947-08-06 1947-08-06 Improvements in or relating to magnetisable divided bodies or compacts Expired GB625627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB21337/47A GB625627A (en) 1947-08-06 1947-08-06 Improvements in or relating to magnetisable divided bodies or compacts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21337/47A GB625627A (en) 1947-08-06 1947-08-06 Improvements in or relating to magnetisable divided bodies or compacts

Publications (1)

Publication Number Publication Date
GB625627A true GB625627A (en) 1949-06-30

Family

ID=10161172

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21337/47A Expired GB625627A (en) 1947-08-06 1947-08-06 Improvements in or relating to magnetisable divided bodies or compacts

Country Status (1)

Country Link
GB (1) GB625627A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864734A (en) * 1958-12-16 Magnetic flake core and method of
US2873225A (en) * 1957-05-20 1959-02-10 Adams Edmond Magnetic flake core
JPS4827116B1 (en) * 1969-09-12 1973-08-18
CN109351962A (en) * 2018-11-30 2019-02-19 蓬莱市超硬复合材料有限公司 A kind of production technology preparing hard alloy roll mixture using paraffin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864734A (en) * 1958-12-16 Magnetic flake core and method of
US2873225A (en) * 1957-05-20 1959-02-10 Adams Edmond Magnetic flake core
JPS4827116B1 (en) * 1969-09-12 1973-08-18
CN109351962A (en) * 2018-11-30 2019-02-19 蓬莱市超硬复合材料有限公司 A kind of production technology preparing hard alloy roll mixture using paraffin

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