JPS5571632A - Production of ferromagnetic powder - Google Patents
Production of ferromagnetic powderInfo
- Publication number
- JPS5571632A JPS5571632A JP14587778A JP14587778A JPS5571632A JP S5571632 A JPS5571632 A JP S5571632A JP 14587778 A JP14587778 A JP 14587778A JP 14587778 A JP14587778 A JP 14587778A JP S5571632 A JPS5571632 A JP S5571632A
- Authority
- JP
- Japan
- Prior art keywords
- cobalt
- dispersion
- alcohol
- iron oxide
- powder
- 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 cobalt-contg. iron oxide ferromagnetic powder having a narrow coercive force distribution by mixing a dispersion of iron oxide magnetic powder and a cobalt salt in an alcohol and an aq. alkali soln. and treating the mixt. at a temp. below the b.p.
CONSTITUTION: A cobalt salt such as cobalt chloride or cobalt sulfate is dissolved in an alcohol having compatibility with water, e.g. methanol or ethylene glycol. Iron oxide magnetic powder such as γ-Fe2O3 or partially reduced γ-Fe2O3 is added to form a dispersion of the powder in the alcohol. This dispersion is then mixed with an aq. alkali soln. contg. alkali in an amt. of an equivalent or more to the cobalt salt, and the mixt. is treated at a temp. below the b.p. for an adequate time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14587778A JPS5571632A (en) | 1978-11-25 | 1978-11-25 | Production of ferromagnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14587778A JPS5571632A (en) | 1978-11-25 | 1978-11-25 | Production of ferromagnetic powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5571632A true JPS5571632A (en) | 1980-05-29 |
JPS6242859B2 JPS6242859B2 (en) | 1987-09-10 |
Family
ID=15395105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14587778A Granted JPS5571632A (en) | 1978-11-25 | 1978-11-25 | Production of ferromagnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5571632A (en) |
-
1978
- 1978-11-25 JP JP14587778A patent/JPS5571632A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6242859B2 (en) | 1987-09-10 |
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