JPS5763606A - Manufacture of magnetic powder - Google Patents
Manufacture of magnetic powderInfo
- Publication number
- JPS5763606A JPS5763606A JP55137419A JP13741980A JPS5763606A JP S5763606 A JPS5763606 A JP S5763606A JP 55137419 A JP55137419 A JP 55137419A JP 13741980 A JP13741980 A JP 13741980A JP S5763606 A JPS5763606 A JP S5763606A
- Authority
- JP
- Japan
- Prior art keywords
- feooh
- gaseous mixture
- air
- magnetic
- reduction
- 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
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
- Paints Or Removers (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
PURPOSE: To obtain ferromagnetic metallic powder for a magnetic recording medium with high coercive force and saturation magnetic flux density suitable especially for high density recording by treating β- or γ-FeOOH in an alkali soln. followed by filtration, washing drying and reduction.
CONSTITUTION: In an alkali soln. such as a 1W20N aqueous soln. of NaOH β- or γ-FeOOH is treated at 30W100°C. The treated material is filtered, washed, and dired. The resulting β- or γ-FeOOH is reduced at ≤600°C in a hydrongen atmosphere. A gaseous mixture consisting of 1% air and 99% N2 is fed to ferromagnetic metallic powder in the reducing vessel obtd. by the reduction, and the air content of the gaseous mixture is doubled at intervals of about 30min. After the passage 4W5hr the gaseous mixture is changed over to air, and magnetic iron powder is taken out of the reducing vessel. This magnetic iron powder is applicable to a megnetic tape and other magnetic recording medium.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137419A JPS5853045B2 (en) | 1980-10-01 | 1980-10-01 | Manufacturing method of magnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55137419A JPS5853045B2 (en) | 1980-10-01 | 1980-10-01 | Manufacturing method of magnetic powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5763606A true JPS5763606A (en) | 1982-04-17 |
JPS5853045B2 JPS5853045B2 (en) | 1983-11-26 |
Family
ID=15198184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55137419A Expired JPS5853045B2 (en) | 1980-10-01 | 1980-10-01 | Manufacturing method of magnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5853045B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932105A (en) * | 1982-08-17 | 1984-02-21 | Mitsui Toatsu Chem Inc | Novel method of manufacturing ferromagnetic iron powder |
JPS61229305A (en) * | 1985-04-03 | 1986-10-13 | Sony Corp | Manufacture of magnetic metal powder |
-
1980
- 1980-10-01 JP JP55137419A patent/JPS5853045B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932105A (en) * | 1982-08-17 | 1984-02-21 | Mitsui Toatsu Chem Inc | Novel method of manufacturing ferromagnetic iron powder |
JPH0454362B2 (en) * | 1982-08-17 | 1992-08-31 | Mitsui Toatsu Chemicals | |
JPS61229305A (en) * | 1985-04-03 | 1986-10-13 | Sony Corp | Manufacture of magnetic metal powder |
Also Published As
Publication number | Publication date |
---|---|
JPS5853045B2 (en) | 1983-11-26 |
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