GB1046241A - Improvements in the production of iron powder having high electrical resistivity - Google Patents

Improvements in the production of iron powder having high electrical resistivity

Info

Publication number
GB1046241A
GB1046241A GB31348/61A GB3134861A GB1046241A GB 1046241 A GB1046241 A GB 1046241A GB 31348/61 A GB31348/61 A GB 31348/61A GB 3134861 A GB3134861 A GB 3134861A GB 1046241 A GB1046241 A GB 1046241A
Authority
GB
United Kingdom
Prior art keywords
iron
powder
iron powder
treated
weight
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
GB31348/61A
Inventor
Sydney George Clarke
Jack Frederick Andrew
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB31348/61A priority Critical patent/GB1046241A/en
Priority to US216986A priority patent/US3245841A/en
Priority to DEN21993A priority patent/DE1291028B/en
Publication of GB1046241A publication Critical patent/GB1046241A/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
    • H01F1/16—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 sheets
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • C23C22/33—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also phosphates
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Powder Metallurgy (AREA)

Abstract

Iron powder such as 1-10 micron size carbonyl powder is treated with a dilute aqueous solution containing 1/2-21/2 % by weight of phosphoric acid and 1/2-21/2 % by weight of chromic acid in relation to the weight of iron powder, the solution being agitated to keep the iron in suspension. The treated iron has an electrically resistant surface coating which produces a specific resistivity of at least 10 megohm/cm cube when the iron is formed into a compact mass. The iron powder may be treated in phosphoric acid before the chromic acid is added to the solution. The powder is used as a magnetic core in H.F. electrical components such as R.F. chokes and transformers.
GB31348/61A 1961-08-31 1961-08-31 Improvements in the production of iron powder having high electrical resistivity Expired GB1046241A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB31348/61A GB1046241A (en) 1961-08-31 1961-08-31 Improvements in the production of iron powder having high electrical resistivity
US216986A US3245841A (en) 1961-08-31 1962-08-15 Production of iron powder having high electrical resistivity
DEN21993A DE1291028B (en) 1961-08-31 1962-08-22 Process for the production of a thin, electrically insulating surface layer on iron powder for use in magnetic cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31348/61A GB1046241A (en) 1961-08-31 1961-08-31 Improvements in the production of iron powder having high electrical resistivity

Publications (1)

Publication Number Publication Date
GB1046241A true GB1046241A (en) 1966-10-19

Family

ID=10321790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31348/61A Expired GB1046241A (en) 1961-08-31 1961-08-31 Improvements in the production of iron powder having high electrical resistivity

Country Status (3)

Country Link
US (1) US3245841A (en)
DE (1) DE1291028B (en)
GB (1) GB1046241A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601765A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
US4601753A (en) * 1983-05-05 1986-07-22 General Electric Company Powdered iron core magnetic devices
DE3439397A1 (en) * 1984-10-27 1986-04-30 Vacuumschmelze Gmbh, 6450 Hanau Process for the production of a soft-magnetic body by powder metallurgy
DE3907090C2 (en) * 1989-03-04 2001-07-26 Vacuumschmelze Gmbh Process for the powder metallurgical production of a soft magnetic body
EP0881959B1 (en) 1996-02-23 2003-09-03 Höganäs Ab Phosphate coated iron powder and method for the manufacturing thereof
US5982073A (en) * 1997-12-16 1999-11-09 Materials Innovation, Inc. Low core loss, well-bonded soft magnetic parts
SE0000454D0 (en) 2000-02-11 2000-02-11 Hoeganaes Ab Iron powder and method for the preparation thereof
JP2002121601A (en) * 2000-10-16 2002-04-26 Aisin Seiki Co Ltd Soft magnetic metal powder particle and treating method thereof, and soft magnetic compact and its manufacturing method
SE0100236D0 (en) 2001-01-26 2001-01-26 Hoeganaes Ab Compressed soft magnetic materials
SE0102103D0 (en) 2001-06-13 2001-06-13 Hoeganaes Ab High density soft magnetic products and method for the preparation thereof
JP2004197212A (en) * 2002-10-21 2004-07-15 Aisin Seiki Co Ltd Soft magnetic molding, method of producing soft magnetic molding, and soft magnetic powder material
US20050019558A1 (en) * 2003-07-24 2005-01-27 Amitabh Verma Coated ferromagnetic particles, method of manufacturing and composite magnetic articles derived therefrom
US20050016658A1 (en) * 2003-07-24 2005-01-27 Thangavelu Asokan Composite coatings for ground wall insulation in motors, method of manufacture thereof and articles derived therefrom
US7803457B2 (en) * 2003-12-29 2010-09-28 General Electric Company Composite coatings for groundwall insulation, method of manufacture thereof and articles derived therefrom
CN103700460B (en) * 2013-09-03 2016-04-20 横店集团东磁股份有限公司 A kind of low-loss is without the preparation method of heat ageing ferrocart core

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1850181A (en) * 1929-02-08 1932-03-22 Automatic Telephone Mfg Co Ltd Magnet core
US1982690A (en) * 1929-08-26 1934-12-04 Johnson Lab Inc Selective radio circuit
DE703669C (en) * 1936-04-30 1941-03-13 Philips Patentverwaltung Magnetic core and method of making the material for the same
US2144425A (en) * 1936-12-09 1939-01-17 Sterling Varnish Company Insulating composition
US2306198A (en) * 1937-04-26 1942-12-22 Verweij Evert Johannes Willem Production of magnetic material
FR837210A (en) * 1937-04-30 1939-02-06 Lignes Telegraph Telephon Method of isolating magnetic powders for compressed cores
FR841684A (en) * 1938-08-03 1939-05-24 Eisen Und Hu Ttenwerke Ag Manufacturing process of silicon sheets for transformers
BE438615A (en) * 1940-03-29
BE462834A (en) * 1944-04-19
BE463593A (en) * 1944-11-14
US2634225A (en) * 1950-06-21 1953-04-07 American Chem Paint Co Ammonium chromate rinse for phosphate coated metal surfaces
US2783208A (en) * 1954-01-04 1957-02-26 Rca Corp Powdered iron magnetic core materials

Also Published As

Publication number Publication date
DE1291028B (en) 1969-03-20
US3245841A (en) 1966-04-12

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