JPS55132005A - Ferromagnetic powder and manufacture therefor - Google Patents

Ferromagnetic powder and manufacture therefor

Info

Publication number
JPS55132005A
JPS55132005A JP3835279A JP3835279A JPS55132005A JP S55132005 A JPS55132005 A JP S55132005A JP 3835279 A JP3835279 A JP 3835279A JP 3835279 A JP3835279 A JP 3835279A JP S55132005 A JPS55132005 A JP S55132005A
Authority
JP
Japan
Prior art keywords
particles
ferromagnetic
cro2
powder particles
stirring
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
JP3835279A
Other languages
Japanese (ja)
Other versions
JPH0123924B2 (en
Inventor
Ken Namikawa
Takeyuki Mouri
Minoru Sato
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.)
TDK Corp
Toppan Inc
Original Assignee
TDK Corp
Toppan Printing Co Ltd
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 TDK Corp, Toppan Printing Co Ltd filed Critical TDK Corp
Priority to JP3835279A priority Critical patent/JPS55132005A/en
Publication of JPS55132005A publication Critical patent/JPS55132005A/en
Publication of JPH0123924B2 publication Critical patent/JPH0123924B2/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
    • G11B5/70626—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
    • G11B5/70636—CrO2

Landscapes

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

Abstract

PURPOSE:To obtain a high density magnetic recording material with high coercive force and orientation effect by adhering Co to the surface of ferromagnetic CrO2 powder particles by electroless deposition after applying the treatments of granulation, sensitization and activation to the surface of ferromagnetic CrO2 powder particles. CONSTITUTION:Ferromagnetic CrO2 powder particles are added into aqueous NaOH solution at 90 deg.C with concentration of 0.4M/l and the surface of the CrO2 particles is granulated after stirring the solution for about an hour. Then, sufficient washing is applied to the surface of the particles with acetone, etc., the particles are immersed in aqueous hydrochloric acid solution of stannous tin with 5X10-2mole/l for about ten minutes at room temperature and the surface is sensitifized. The surface is then activated by using aqueous hydrochloric acid solution of palladium chloride with 3X10<-3>mol/l and one hour drying is applied at 50 deg.C after washing the surface at room temperature. Finally, while stirring, Co is precitated on the surface of the particles by applying electroless deposition thereto at 80 deg.C by using a plating liquid consisting of CoSO4.7H2O, NaH2PO2, Na3C6H5O7, H3BO3.
JP3835279A 1979-04-02 1979-04-02 Ferromagnetic powder and manufacture therefor Granted JPS55132005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3835279A JPS55132005A (en) 1979-04-02 1979-04-02 Ferromagnetic powder and manufacture therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3835279A JPS55132005A (en) 1979-04-02 1979-04-02 Ferromagnetic powder and manufacture therefor

Publications (2)

Publication Number Publication Date
JPS55132005A true JPS55132005A (en) 1980-10-14
JPH0123924B2 JPH0123924B2 (en) 1989-05-09

Family

ID=12522878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3835279A Granted JPS55132005A (en) 1979-04-02 1979-04-02 Ferromagnetic powder and manufacture therefor

Country Status (1)

Country Link
JP (1) JPS55132005A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686142A (en) * 1982-07-31 1987-08-11 Bayer Aktiengesellschaft Process for the production of iron oxides epitaxially coated with cobalt the coated oxides and their cue
US4919776A (en) * 1984-07-06 1990-04-24 Hitachi Maxell, Ltd. Ferromagnetic powder and method for producing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4949898A (en) * 1972-05-24 1974-05-15

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4949898A (en) * 1972-05-24 1974-05-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686142A (en) * 1982-07-31 1987-08-11 Bayer Aktiengesellschaft Process for the production of iron oxides epitaxially coated with cobalt the coated oxides and their cue
US4919776A (en) * 1984-07-06 1990-04-24 Hitachi Maxell, Ltd. Ferromagnetic powder and method for producing the same

Also Published As

Publication number Publication date
JPH0123924B2 (en) 1989-05-09

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