JPS57181102A - Manufacture of magnetic iron oxide grain powder for magnetic recording material - Google Patents

Manufacture of magnetic iron oxide grain powder for magnetic recording material

Info

Publication number
JPS57181102A
JPS57181102A JP56066483A JP6648381A JPS57181102A JP S57181102 A JPS57181102 A JP S57181102A JP 56066483 A JP56066483 A JP 56066483A JP 6648381 A JP6648381 A JP 6648381A JP S57181102 A JPS57181102 A JP S57181102A
Authority
JP
Japan
Prior art keywords
iron oxide
magnetic iron
magnetic
barium
solution
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.)
Granted
Application number
JP56066483A
Other languages
Japanese (ja)
Other versions
JPS6051242B2 (en
Inventor
Hiroyuki Kondo
Nariyasu Jikuhara
Atsushi Takedoi
Masaru Isoai
Kazuyuki Takama
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.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo Corp
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 Toda Kogyo Corp filed Critical Toda Kogyo Corp
Priority to JP56066483A priority Critical patent/JPS6051242B2/en
Publication of JPS57181102A publication Critical patent/JPS57181102A/en
Publication of JPS6051242B2 publication Critical patent/JPS6051242B2/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
    • G11B5/70678—Ferrites

Landscapes

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

Abstract

PURPOSE:To produce the characteristics of high coercive force and high saturation magnetization, and to improve a transfer characteristic in the case when the titled powder is used for a magnetic tape, etc. largely by denaturing magnetic iron oxide grains by cobalt, ferrous salt and barium or strontium. CONSTITUTION:A cobalt salt aqueous solution, the ferrous salt aqueous solution and barium or strontium salt are added into the dispersed liquid of the magnetic iron oxide grains expressed by FeOX.Fe2O3 (where 0<=X<=1), the concentration of OH radicals in the solution is brought to 0.05-3.0mol/l by adding alkali, the solution is agitated and held in a nonoxidizing atmosphere at a 50-100 deg.C solution temperature, and the magnetic iron oxide grains are denatured by cobalt, ferrous salt and barium or strontium, and filtered and dried. Accordingly, the characteristics of high coercive force and high saturation magnetization are produced, and the transfer characteristic in the case when the titled powder is used for the magnetic tape, etc. can largely be improved.
JP56066483A 1981-04-30 1981-04-30 Method for producing magnetic iron oxide particles for magnetic recording materials Expired JPS6051242B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56066483A JPS6051242B2 (en) 1981-04-30 1981-04-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56066483A JPS6051242B2 (en) 1981-04-30 1981-04-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Publications (2)

Publication Number Publication Date
JPS57181102A true JPS57181102A (en) 1982-11-08
JPS6051242B2 JPS6051242B2 (en) 1985-11-13

Family

ID=13317071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56066483A Expired JPS6051242B2 (en) 1981-04-30 1981-04-30 Method for producing magnetic iron oxide particles for magnetic recording materials

Country Status (1)

Country Link
JP (1) JPS6051242B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
US4851258A (en) * 1987-01-21 1989-07-25 Showa Denko Kabushiki Kaisha Method for preparing magnetic particles for magnetic-recording media

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819733A (en) * 1981-07-28 1983-02-04 Toshiba Corp Magnetic recording medium and its manufacture
JPS6250889B2 (en) * 1981-07-28 1987-10-27 Tokyo Shibaura Electric Co
US4851258A (en) * 1987-01-21 1989-07-25 Showa Denko Kabushiki Kaisha Method for preparing magnetic particles for magnetic-recording media

Also Published As

Publication number Publication date
JPS6051242B2 (en) 1985-11-13

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