JPS55162430A - Manufacture of ferromagnetic powder - Google Patents
Manufacture of ferromagnetic powderInfo
- Publication number
- JPS55162430A JPS55162430A JP6935879A JP6935879A JPS55162430A JP S55162430 A JPS55162430 A JP S55162430A JP 6935879 A JP6935879 A JP 6935879A JP 6935879 A JP6935879 A JP 6935879A JP S55162430 A JPS55162430 A JP S55162430A
- Authority
- JP
- Japan
- Prior art keywords
- cobalt
- contg
- water soluble
- salt
- soluble salt
- 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.)
- Pending
Links
Landscapes
- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To obtain ferromagnetic powder having a sharp coercive force distribution and high retentivity and useful as a recording element by using iron oxide magnetic powder particles as nucleus crystals and reacting a cobalt-contg. metal salt and an alkali in the presence of a water soluble salt of alginic acid.
CONSTITUTION: To an aqueous suspension of iron oxide magnetic powder are added a metal salt such as ferrous sulfate contg. a cobalt salt such as cobalt sulfate, an alkali such as caustic soda, and a water soluble salt of alginic acid. A water soluble salt of citric acid and a water soluble salt of tartaric acid may be added. They are reacted while agitating to form cobalt-contg. layers on the nucleus crystals of the iron oxide magnetic powder. By this method a metal compound contg. a fine cobalt compound is deposited, so the cobalt-contg. layers formed on the nucleus crystals are made dense.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6935879A JPS55162430A (en) | 1979-06-02 | 1979-06-02 | Manufacture of ferromagnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6935879A JPS55162430A (en) | 1979-06-02 | 1979-06-02 | Manufacture of ferromagnetic powder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55162430A true JPS55162430A (en) | 1980-12-17 |
Family
ID=13400246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6935879A Pending JPS55162430A (en) | 1979-06-02 | 1979-06-02 | Manufacture of ferromagnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55162430A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5860624A (en) * | 1981-10-01 | 1983-04-11 | Agency Of Ind Science & Technol | Ferromagnetic powder and its preparation |
EP0127427A2 (en) * | 1983-05-23 | 1984-12-05 | Celanese Corporation | Production of microcrystralline ferrimagnetic spinels |
-
1979
- 1979-06-02 JP JP6935879A patent/JPS55162430A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5860624A (en) * | 1981-10-01 | 1983-04-11 | Agency Of Ind Science & Technol | Ferromagnetic powder and its preparation |
JPS6018609B2 (en) * | 1981-10-01 | 1985-05-11 | 工業技術院長 | Ferromagnetic powder and its manufacturing method |
EP0127427A2 (en) * | 1983-05-23 | 1984-12-05 | Celanese Corporation | Production of microcrystralline ferrimagnetic spinels |
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