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GB1234378A - - Google Patents

Info

Publication number
GB1234378A
GB1234378A GB1234378DA GB1234378A GB 1234378 A GB1234378 A GB 1234378A GB 1234378D A GB1234378D A GB 1234378DA GB 1234378 A GB1234378 A GB 1234378A
Authority
GB
United Kingdom
Prior art keywords
particles
metal
optionally
june
salts
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
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 filed Critical
Publication of GB1234378A publication Critical patent/GB1234378A/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
    • H01F1/09—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin
    • 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
    • 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
    • H01F1/061—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 with a protective layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

1,234,378. Ferromagnetic particles. E.I. DU PONT DE NEMOURS & CO. June 24, 1969 [June 25, 1968], No.31958/69. Headings C7A and C7D. Ferromagnetic particles having a maximum dimension of 4 microns, and preferably acicular, comprise Fe, Ni and/or Co; 0-20% by weight Cr; and B, N and/or P in amount less than the minimum required to form a compound with all of the metal, the particles having a polyphase structure with metal as one phase and a compound or compounds of the metal(s) with B, N and/or P as at least one additional phase, the particles being coated with a thin oxide film. The particles are produced by precipitation from solutions of Fe, Ni and/or Co salts, optionally containing Cr salts, using borohydride, hypophosphite or hydrazine as reducing agents, optionally with PdCl 2 as catalyst, and preferably in a magnetic field: the resulting particles may be heated in hydrogen and then in an inert gas containing oxygen. The particles may be compacted, optionally with binders, to form permanent magnets. Alternatively, they may be mixed with a film-forming binder and coated on to a substrate to form a magnetic recording member.
GB1234378D 1968-06-25 1969-06-24 Expired GB1234378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73973268A 1968-06-25 1968-06-25

Publications (1)

Publication Number Publication Date
GB1234378A true GB1234378A (en) 1971-06-03

Family

ID=24973549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1234378D Expired GB1234378A (en) 1968-06-25 1969-06-24

Country Status (7)

Country Link
US (1) US3567525A (en)
BE (1) BE735055A (en)
DE (1) DE1931521B2 (en)
FR (1) FR2014221A1 (en)
GB (1) GB1234378A (en)
NL (1) NL6909421A (en)
SE (1) SE344383B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445597A1 (en) * 1978-12-29 1980-07-25 Exxon Research Engineering Co COMPOSITION COMPRISING PARTICLES OF MAGNETIC ALLOYS USEFUL FOR PREPARING SOLID MAGNETISABLE COMPOSITIONS, AND METHOD FOR OBTAINING SAME
GB2131047A (en) * 1982-11-29 1984-06-13 Kanto Denka Kogyo Kk Ferromagnetic metallic powders useful for magnetic recording and processes for producing said metallic powders

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661556A (en) * 1969-03-03 1972-05-09 Du Pont Method of making ferromagnetic metal powders
US3663318A (en) * 1970-10-05 1972-05-16 Du Pont Process for making ferromagnetic metal powders
US3855016A (en) * 1971-03-24 1974-12-17 Graham Magnetics Inc Acicular cobalt powders having high squarenesss ratios
US3755008A (en) * 1971-03-24 1973-08-28 Graham Magnetics Inc Process for enhancing magnetic properties of metal powder by heat treating with salt
US3859130A (en) * 1971-04-15 1975-01-07 Ibm Magnetic alloy particle compositions and method of manufacture
JPS5029157B1 (en) * 1971-05-27 1975-09-20
US3837912A (en) * 1972-05-22 1974-09-24 Minnesota Mining & Mfg Environmentally stable iron-based magnetic recording medium
US3865627A (en) 1972-05-22 1975-02-11 Minnesota Mining & Mfg Magnetic recording medium incorporating fine acicular iron-based particles
JPS59962B2 (en) * 1973-08-15 1984-01-10 富士写真フイルム株式会社 Jikikirokubaitaiyoufunmatsujiseizairiyo Oyobi Seizouhouhou
JPS5633775B2 (en) * 1973-08-18 1981-08-06
US4054530A (en) * 1973-09-28 1977-10-18 Graham Magnetics, Inc. Iron-nickel-cobalt magnetic powder and tape prepared therefrom
US3899369A (en) * 1974-03-11 1975-08-12 Ibm Process for the production of magnetic materials having selective coercivity by using selected D.C. magnetic fields
US3954520A (en) * 1974-03-11 1976-05-04 International Business Machines Corporation Process for the production of magnetic materials
US3975217A (en) * 1974-03-29 1976-08-17 Sherritt Gordon Mines Limited Finely divided magnetic cobalt powder
DE2434096C2 (en) * 1974-07-16 1985-10-17 Basf Ag, 6700 Ludwigshafen Acicular ferromagnetic metal particles consisting primarily of iron and processes for their manufacture
JPS5133758A (en) * 1974-09-17 1976-03-23 Fuji Photo Film Co Ltd
JPS5816248B2 (en) * 1975-11-05 1983-03-30 富士写真フイルム株式会社 Shinkinajikikirokutai
CH603802A5 (en) * 1975-12-02 1978-08-31 Bbc Brown Boveri & Cie
JPS5376957A (en) * 1976-12-20 1978-07-07 Hitachi Maxell Magnetic metal iron powder and said manufacturing process
DE2743298A1 (en) * 1977-09-27 1979-04-05 Basf Ag FERROMAGNETIC METAL PARTS CONSISTING MAINLY OF IRON AND THE PROCESS FOR THEIR PRODUCTION
JPS54122663A (en) * 1978-03-16 1979-09-22 Kanto Denka Kogyo Kk Production of magnetic powder for magnetic recording based on iron
JPS5853022A (en) 1981-09-24 1983-03-29 Hitachi Maxell Ltd Magnetic recording medium
DE3707522A1 (en) * 1986-03-12 1987-09-24 Matsushita Electric Ind Co Ltd MAGNETIC NITRIDE FILM
US4752344A (en) * 1986-12-22 1988-06-21 International Business Machines Corporation Magnetic layer and method of manufacture
US5238483A (en) * 1989-01-27 1993-08-24 Toda Kogyo Corporation Acicular magnetic iron based alloy particles for magnetic recording and method of producing the same
DE68918836T2 (en) * 1989-01-27 1995-02-23 Toda Kogyo Corp Needle-shaped magnetic particles made of an iron alloy for magnetic recording and process for their production.
US5656381A (en) * 1993-03-24 1997-08-12 Sanyo Electric Co., Ltd. Magnetoresistance-effect element
US5736921A (en) * 1994-03-23 1998-04-07 Sanyo Electric Co., Ltd. Magnetoresistive element
US5585198A (en) * 1993-10-20 1996-12-17 Sanyo Electric Co., Ltd. Magnetorsistance effect element
US5695858A (en) * 1994-03-23 1997-12-09 Sanyo Electric Co., Ltd. Magnetoresistive element
JPH0849062A (en) * 1994-08-04 1996-02-20 Sanyo Electric Co Ltd Magnetoresistance effect film
JPH08130337A (en) * 1994-09-09 1996-05-21 Sanyo Electric Co Ltd Magnetoresistive element and manufacture thereof
DE19932473A1 (en) * 1999-07-12 2001-01-25 Vacuumschmelze Gmbh Corrosion resistant iron-nickel-chromium alloy, for fault current safety switch relays and timepiece mechanism stepping motors, has low calcium, magnesium and sulfur contents
JP5280500B2 (en) * 2011-08-25 2013-09-04 太陽誘電株式会社 Wire wound inductor
CN113774217A (en) * 2021-08-19 2021-12-10 南方科技大学 Synchronous recovery method of various metal ions in leaching solution of electronic products

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445597A1 (en) * 1978-12-29 1980-07-25 Exxon Research Engineering Co COMPOSITION COMPRISING PARTICLES OF MAGNETIC ALLOYS USEFUL FOR PREPARING SOLID MAGNETISABLE COMPOSITIONS, AND METHOD FOR OBTAINING SAME
GB2131047A (en) * 1982-11-29 1984-06-13 Kanto Denka Kogyo Kk Ferromagnetic metallic powders useful for magnetic recording and processes for producing said metallic powders

Also Published As

Publication number Publication date
US3567525A (en) 1971-03-02
DE1931521A1 (en) 1971-04-22
FR2014221A1 (en) 1970-04-17
SE344383B (en) 1972-04-10
BE735055A (en) 1969-12-24
DE1931521B2 (en) 1971-10-07
NL6909421A (en) 1969-12-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees