JPS5616604A - Manufacture of ferromagnetic iron-cobalt alloy powder - Google Patents
Manufacture of ferromagnetic iron-cobalt alloy powderInfo
- Publication number
- JPS5616604A JPS5616604A JP9170179A JP9170179A JPS5616604A JP S5616604 A JPS5616604 A JP S5616604A JP 9170179 A JP9170179 A JP 9170179A JP 9170179 A JP9170179 A JP 9170179A JP S5616604 A JPS5616604 A JP S5616604A
- Authority
- JP
- Japan
- Prior art keywords
- alloy powder
- goethite
- cobalt alloy
- ferromagnetic iron
- soln
- 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
- Paints Or Removers (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To manufacture ferromagnetic iron-cobalt alloy powder, by using a compound material made by sticking fine Co(OH)3 on the surface of needlelike goethite particles prepared from a soln. of ferrous salt.
CONSTITUTION: To a soln. of ferrous salt is added an aqueous alkali soln. in an amount ≥4OH-/Fe2+mol ratio to prepard ferrous hydroxide, which is allowed to contact with a gas contg. oxygen in order to convert the ferrous salt completely into goethite crystals. Subsequently, cobaltous ions in an amount ≤50%Co/(Fe+Co)mol ratio are added to the reaction system, and the system is allowed to contact with oxygen-contg. gas at ≤60°C temp. Hereby, cobaltic hydroxyde sticks to the surface of goethite crystals to form a compound material of goethite and cobaltic salt. The compound material is converted into compound oxide by heating. Ferromagnetic iron-cobalt alloy powder is prepared by reducing the oxide compound with hydrogen.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54091701A JPS5855203B2 (en) | 1979-07-20 | 1979-07-20 | Method for producing iron-cobalt alloy ferromagnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54091701A JPS5855203B2 (en) | 1979-07-20 | 1979-07-20 | Method for producing iron-cobalt alloy ferromagnetic powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5616604A true JPS5616604A (en) | 1981-02-17 |
JPS5855203B2 JPS5855203B2 (en) | 1983-12-08 |
Family
ID=14033815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54091701A Expired JPS5855203B2 (en) | 1979-07-20 | 1979-07-20 | Method for producing iron-cobalt alloy ferromagnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5855203B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832233A (en) * | 1981-08-21 | 1983-02-25 | Hitachi Ltd | Magnetic recording medium |
US5735969A (en) * | 1996-03-07 | 1998-04-07 | Imation Corp. | Method of producing acicular magnetic alloy particles |
-
1979
- 1979-07-20 JP JP54091701A patent/JPS5855203B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832233A (en) * | 1981-08-21 | 1983-02-25 | Hitachi Ltd | Magnetic recording medium |
JPH0253850B2 (en) * | 1981-08-21 | 1990-11-20 | Hitachi Ltd | |
US5735969A (en) * | 1996-03-07 | 1998-04-07 | Imation Corp. | Method of producing acicular magnetic alloy particles |
Also Published As
Publication number | Publication date |
---|---|
JPS5855203B2 (en) | 1983-12-08 |
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