JPS5556019A - Production of ferromagnetic powder - Google Patents

Production of ferromagnetic powder

Info

Publication number
JPS5556019A
JPS5556019A JP12986578A JP12986578A JPS5556019A JP S5556019 A JPS5556019 A JP S5556019A JP 12986578 A JP12986578 A JP 12986578A JP 12986578 A JP12986578 A JP 12986578A JP S5556019 A JPS5556019 A JP S5556019A
Authority
JP
Japan
Prior art keywords
powder
dispersion
cobalt
contg
alkali
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
JP12986578A
Other languages
Japanese (ja)
Other versions
JPS6242858B2 (en
Inventor
Susumu Kitaoka
Haruo Ando
Toshinobu Sueyoshi
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.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell 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 Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP12986578A priority Critical patent/JPS5556019A/en
Publication of JPS5556019A publication Critical patent/JPS5556019A/en
Publication of JPS6242858B2 publication Critical patent/JPS6242858B2/ja
Granted legal-status Critical Current

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  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To obtain ferromagnetic powder of high coercive force useful as the recording element of a magnetic recording medium by treating a dispersion contg. magnetic powder, a cobalt salt, a ferrous salt and an alkali to form a cobalt-contg. iron oxide layer on the magnetic powder.
CONSTITUTION: Fe2O3 powder or iron oxide magnetic powder, e.g. obtd. by partially reducing the Fe2O3 powder in a reducing gas such as hydrogen is dispersed in a mixed aq. soln. of a cobalt salt and a ferrous salt. To the dispersion is added an alkali such as sodium hydroxide in an amt. of one equivalent or more to the total amt. of the salts in the dispersion. The alkali-added dispersion is then treated at 50°C or below, pref. 30°C or below to form 2wt% or less of a cobalt-contg. iron oxide layer on the magnetic powder.
COPYRIGHT: (C)1980,JPO&Japio
JP12986578A 1978-10-20 1978-10-20 Production of ferromagnetic powder Granted JPS5556019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12986578A JPS5556019A (en) 1978-10-20 1978-10-20 Production of ferromagnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12986578A JPS5556019A (en) 1978-10-20 1978-10-20 Production of ferromagnetic powder

Publications (2)

Publication Number Publication Date
JPS5556019A true JPS5556019A (en) 1980-04-24
JPS6242858B2 JPS6242858B2 (en) 1987-09-10

Family

ID=15020184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12986578A Granted JPS5556019A (en) 1978-10-20 1978-10-20 Production of ferromagnetic powder

Country Status (1)

Country Link
JP (1) JPS5556019A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57123831A (en) * 1981-01-20 1982-08-02 Sakai Chem Ind Co Ltd Preparation of magnetic iron oxide powder
JPS5832027A (en) * 1981-07-28 1983-02-24 Ishihara Sangyo Kaisha Ltd Preparation of ferromagnetic powder of cobalt-containing iron oxide
JPS5888122A (en) * 1981-11-20 1983-05-26 Ishihara Sangyo Kaisha Ltd Production of cobalt-containing ferromagnetic iron oxide
JPS6081026A (en) * 1983-10-06 1985-05-09 Ishihara Sangyo Kaisha Ltd Manufacture of magnetic iron oxide containing cobalt
JPH01194306A (en) * 1988-01-29 1989-08-04 Sony Corp Manufacture of cobalt-contained iron oxide magnetic powder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4974399A (en) * 1972-11-24 1974-07-18
JPS5037668A (en) * 1973-08-07 1975-04-08
JPS5037667A (en) * 1973-08-07 1975-04-08
JPS53129895A (en) * 1977-04-20 1978-11-13 Hitachi Maxell Method of manufacturing ferromagnetic powder for magnetic recording
JPS5556605A (en) * 1978-10-20 1980-04-25 Hitachi Maxell Ltd Magnetic recording medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4974399A (en) * 1972-11-24 1974-07-18
JPS5037668A (en) * 1973-08-07 1975-04-08
JPS5037667A (en) * 1973-08-07 1975-04-08
JPS53129895A (en) * 1977-04-20 1978-11-13 Hitachi Maxell Method of manufacturing ferromagnetic powder for magnetic recording
JPS5556605A (en) * 1978-10-20 1980-04-25 Hitachi Maxell Ltd Magnetic recording medium

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57123831A (en) * 1981-01-20 1982-08-02 Sakai Chem Ind Co Ltd Preparation of magnetic iron oxide powder
JPS6029646B2 (en) * 1981-01-20 1985-07-11 堺化学工業株式会社 Method for producing magnetic iron oxide powder
JPS5832027A (en) * 1981-07-28 1983-02-24 Ishihara Sangyo Kaisha Ltd Preparation of ferromagnetic powder of cobalt-containing iron oxide
JPS6132257B2 (en) * 1981-07-28 1986-07-25 Ishihara Sangyo Kaisha
JPS5888122A (en) * 1981-11-20 1983-05-26 Ishihara Sangyo Kaisha Ltd Production of cobalt-containing ferromagnetic iron oxide
JPS6132259B2 (en) * 1981-11-20 1986-07-25 Ishihara Sangyo Kaisha
JPS6081026A (en) * 1983-10-06 1985-05-09 Ishihara Sangyo Kaisha Ltd Manufacture of magnetic iron oxide containing cobalt
JPH01194306A (en) * 1988-01-29 1989-08-04 Sony Corp Manufacture of cobalt-contained iron oxide magnetic powder

Also Published As

Publication number Publication date
JPS6242858B2 (en) 1987-09-10

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