GB590392A - Improvements in or relating to the manufacture of magnets - Google Patents

Improvements in or relating to the manufacture of magnets

Info

Publication number
GB590392A
GB590392A GB9074/45A GB907445A GB590392A GB 590392 A GB590392 A GB 590392A GB 9074/45 A GB9074/45 A GB 9074/45A GB 907445 A GB907445 A GB 907445A GB 590392 A GB590392 A GB 590392A
Authority
GB
United Kingdom
Prior art keywords
powder
iron
aluminium
hydrogen
bubbled
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
GB9074/45A
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.)
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Original Assignee
Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
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 Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU filed Critical Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
Publication of GB590392A publication Critical patent/GB590392A/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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/06—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/08—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/23—Magnetisable or magnetic paints or lacquers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Powder Metallurgy (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

Permanent magnets are made from a powder composed of grains of a magnetic material having dimensions of the order of those of colloidal particles e.g. 1/100 to 1 micron by agglomeration with or without a binding agent at a temperature low enough to avoid sintering or coalescence. The powder may be obtained by decomposing in a slightly inclined, externally heated, rotating tube, a compound or a mixture or a solid solution of compounds such as formates, oxalates, hydroxides or carbonates of one or more magnetic metals e.g. iron, nickel, cobalt, at about 300 DEG C. accompanied or followed by reduction preferably under hydrogen or carbon monoxide. The reducing gas may travel up the tube while the powder passes down. Alternatively the Raney method may be used in which the metal powder is produced from an alloy of aluminium with iron or nickel by attacking with soda to remove the aluminium. In another method hydrogen is bubbled through iron carbonyl at 50 DEG C. and the mixture of carbonyl iron vapour and hydrogen so obtained is bubbled through oil at 300 DEG C. A suitable powder may also be obtained as the condensate, reduced if necessary, of a volatilized metal. The powders may be pyrophoric and are then embedded in acetone or kept in a reducing atmosphere. The magnetic metals may be alloys containing chromium, manganese, aluminium, bismuth, titanium, molybdenum, tungsten or copper. Examples are given of the proportions and temperatures to be used, and the densities, high coercive force and remanence of the permanent magnets made by compressing the powders so obtained.
GB9074/45A 1942-04-07 1945-04-11 Improvements in or relating to the manufacture of magnets Expired GB590392A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR590392X 1942-04-07

Publications (1)

Publication Number Publication Date
GB590392A true GB590392A (en) 1947-07-16

Family

ID=8963380

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9074/45A Expired GB590392A (en) 1942-04-07 1945-04-11 Improvements in or relating to the manufacture of magnets

Country Status (1)

Country Link
GB (1) GB590392A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497268A (en) * 1944-07-26 1950-02-14 Electro Chimie Metal Permanent magnets and method for the obtention of the same
US2534178A (en) * 1946-02-15 1950-12-12 Electiro Chimie D Electro Meta Manufacture of permanent magnets
US2651105A (en) * 1942-04-07 1953-09-08 Electro Chimie Metal Manufacture of permanent magnets
US2875035A (en) * 1955-04-05 1959-02-24 Republic Steel Corp Process of eliminating pyrophorism in articles formed from chemically reduced metallic iron
US2879154A (en) * 1956-10-02 1959-03-24 Franklin Inst Of The State Of Acicular metal particles and method of making the same
DE1068394B (en) * 1959-11-05
US3005701A (en) * 1957-10-15 1961-10-24 Bethlehem Steel Corp Method of making melting stock by direct reduction
US3424578A (en) * 1967-06-05 1969-01-28 Us Air Force Method of producing permanent magnets of rare earth metals containing co,or mixtures of co,fe and mn

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068394B (en) * 1959-11-05
US2651105A (en) * 1942-04-07 1953-09-08 Electro Chimie Metal Manufacture of permanent magnets
US2497268A (en) * 1944-07-26 1950-02-14 Electro Chimie Metal Permanent magnets and method for the obtention of the same
US2534178A (en) * 1946-02-15 1950-12-12 Electiro Chimie D Electro Meta Manufacture of permanent magnets
US2875035A (en) * 1955-04-05 1959-02-24 Republic Steel Corp Process of eliminating pyrophorism in articles formed from chemically reduced metallic iron
US2879154A (en) * 1956-10-02 1959-03-24 Franklin Inst Of The State Of Acicular metal particles and method of making the same
US3005701A (en) * 1957-10-15 1961-10-24 Bethlehem Steel Corp Method of making melting stock by direct reduction
US3424578A (en) * 1967-06-05 1969-01-28 Us Air Force Method of producing permanent magnets of rare earth metals containing co,or mixtures of co,fe and mn

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