JPS55157214A - Manufacture of magnetic recording powder - Google Patents

Manufacture of magnetic recording powder

Info

Publication number
JPS55157214A
JPS55157214A JP6399779A JP6399779A JPS55157214A JP S55157214 A JPS55157214 A JP S55157214A JP 6399779 A JP6399779 A JP 6399779A JP 6399779 A JP6399779 A JP 6399779A JP S55157214 A JPS55157214 A JP S55157214A
Authority
JP
Japan
Prior art keywords
powder
reducing
reducing gas
gas
iron
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
JP6399779A
Other languages
Japanese (ja)
Other versions
JPH0159724B2 (en
Inventor
Mitsuyoshi Hashimoto
Sadao Kobayashi
Kazufumi Oshima
Mitsuo Matsunaga
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.)
Mitsui Toatsu Chemicals Inc
Original Assignee
Mitsui Toatsu Chemicals Inc
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 Mitsui Toatsu Chemicals Inc filed Critical Mitsui Toatsu Chemicals Inc
Priority to JP6399779A priority Critical patent/JPS55157214A/en
Publication of JPS55157214A publication Critical patent/JPS55157214A/en
Publication of JPH0159724B2 publication Critical patent/JPH0159724B2/ja
Granted 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
    • G11B5/70605—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 metals or alloys
    • G11B5/70615—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 metals or alloys containing Fe metal or alloys

Landscapes

  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Hard Magnetic Materials (AREA)
  • Paints Or Removers (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To manufacture reducing metallic powder as high performance magnetic recording powder in mass production in an industrical scale by reducing fine particles of iron compound powder with reducing gas containing hydrogen as reducing component. CONSTITUTION:alpha-Fe2O3, gamma-Fe2O3, and iron formate powder or the like are reduced in contact with reducing gas such as pure hydrogen gas or the like under reducing conditions of 0.05-50kg/cm<2> of pressure, 150-500 deg.C, preferably 200- 450 deg.C of temperature. In this case the reducing gas is flowed at an air tower linear speed of 1-20cm/sec., and the stock material is stirred. Thus, the reducing gas is dispersibly retained in the powder to form a mixture of uniform powder and reducing gas of viscosity much lower than the sole powder over the entire reaction period. The magnetic properties of the obtained reduced metallic iron is excellent with less irregular quality.
JP6399779A 1979-05-25 1979-05-25 Manufacture of magnetic recording powder Granted JPS55157214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6399779A JPS55157214A (en) 1979-05-25 1979-05-25 Manufacture of magnetic recording powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6399779A JPS55157214A (en) 1979-05-25 1979-05-25 Manufacture of magnetic recording powder

Publications (2)

Publication Number Publication Date
JPS55157214A true JPS55157214A (en) 1980-12-06
JPH0159724B2 JPH0159724B2 (en) 1989-12-19

Family

ID=13245406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6399779A Granted JPS55157214A (en) 1979-05-25 1979-05-25 Manufacture of magnetic recording powder

Country Status (1)

Country Link
JP (1) JPS55157214A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723010A (en) * 1980-06-04 1982-02-06 Basf Ag Production of feromagnetic metal small piece comprising iron substantially in needle form
US5470374A (en) * 1992-09-10 1995-11-28 Kao Corporation Method for production of magnetic metal particles and apparatus therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4854497A (en) * 1971-11-10 1973-07-31
JPS53103197A (en) * 1977-02-18 1978-09-08 Hitachi Maxell Method of manufacturing magnetic material for magnetic recording medium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4854497A (en) * 1971-11-10 1973-07-31
JPS53103197A (en) * 1977-02-18 1978-09-08 Hitachi Maxell Method of manufacturing magnetic material for magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723010A (en) * 1980-06-04 1982-02-06 Basf Ag Production of feromagnetic metal small piece comprising iron substantially in needle form
JPH0269938U (en) * 1980-06-04 1990-05-28
JPH0431234Y2 (en) * 1980-06-04 1992-07-28
US5470374A (en) * 1992-09-10 1995-11-28 Kao Corporation Method for production of magnetic metal particles and apparatus therefor

Also Published As

Publication number Publication date
JPH0159724B2 (en) 1989-12-19

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