GB899680A - Improvements in or relating to magnetic recording powders - Google Patents

Improvements in or relating to magnetic recording powders

Info

Publication number
GB899680A
GB899680A GB1088359A GB1088359A GB899680A GB 899680 A GB899680 A GB 899680A GB 1088359 A GB1088359 A GB 1088359A GB 1088359 A GB1088359 A GB 1088359A GB 899680 A GB899680 A GB 899680A
Authority
GB
United Kingdom
Prior art keywords
heating
magnetic recording
relating
product
atmosphere
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
GB1088359A
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.)
PRESIDENT OF AGENCY OF IND
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
PRESIDENT OF AGENCY OF IND
Agency of Industrial Science and Technology
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 PRESIDENT OF AGENCY OF IND, Agency of Industrial Science and Technology filed Critical PRESIDENT OF AGENCY OF IND
Publication of GB899680A publication Critical patent/GB899680A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides

Landscapes

  • Paints Or Removers (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

A magnetic recording powder is prepared by co-precipitating cobalt and iron hydroxides from an alkaline medium, heating the resultant precipitate in its mother liquor to convert it to a crystalline precipitate, preferably by heating under pressure to a temperature of at least 100 DEG C., especially 130 DEG C.-170 DEG C., separating the crystals, and heating them in a reducing atmosphere, preferably at 350 DEG C.-400 DEG C. for example in an atmosphere of hydrogen, carbon monixide, or city gas. The product may then be reoxidized by heating, for example to 200 DEG C. to 550 DEG C. in air. The mol. ratio of cobalt oxide to ferric oxide in the product is preferably not greater than 1:1 and especially from 0,2% to 3%.
GB1088359A 1958-04-09 1959-03-31 Improvements in or relating to magnetic recording powders Expired GB899680A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP951058 1958-04-09

Publications (1)

Publication Number Publication Date
GB899680A true GB899680A (en) 1962-06-27

Family

ID=11722225

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1088359A Expired GB899680A (en) 1958-04-09 1959-03-31 Improvements in or relating to magnetic recording powders

Country Status (1)

Country Link
GB (1) GB899680A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3425666A (en) * 1963-02-21 1969-02-04 Chevron Res Process for producing ferrimagnetic materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3425666A (en) * 1963-02-21 1969-02-04 Chevron Res Process for producing ferrimagnetic materials

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