JPS5556019A - Production of ferromagnetic powder - Google Patents
Production of ferromagnetic powderInfo
- 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
Links
Landscapes
- 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
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)
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)
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 |
-
1978
- 1978-10-20 JP JP12986578A patent/JPS5556019A/en active Granted
Patent Citations (5)
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)
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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