JPS54128498A - Treating method for cobalt-containing iron oxide magnetic powder - Google Patents
Treating method for cobalt-containing iron oxide magnetic powderInfo
- Publication number
- JPS54128498A JPS54128498A JP3738178A JP3738178A JPS54128498A JP S54128498 A JPS54128498 A JP S54128498A JP 3738178 A JP3738178 A JP 3738178A JP 3738178 A JP3738178 A JP 3738178A JP S54128498 A JPS54128498 A JP S54128498A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- magnetic powder
- oxide magnetic
- powder
- ratio
- 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 enhance the transfer characteristics of a magnetic recording medium as a recording element by oxidizing iron oxide magnetic powder conts. Co dissolved in the particles until the Fe2+ content reaches a specific value, followed by heat treatment at a low temp.
CONSTITUTION: Co-dissolved iron oxide magnetic powder having the ratio of Fe2+/total Fe 0.06W0.15 is oxidized in an oxidizing atmosphere usually at about 150W300°C to regulate the ratio to around 0.06. The powder is then heat treated at below 80, pref. 50W70°C to enhance the treansfer characteristics. The heat treatment time is above 3000 hr at 50°C, above 300 hr at 70°C and above 100 hr at 80°C. The powder may be heat treated directly in an oxidizing atmosphere at below 80°C until the ratio lowers to below 0.06 while being oxidized.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3738178A JPS54128498A (en) | 1978-03-29 | 1978-03-29 | Treating method for cobalt-containing iron oxide magnetic powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3738178A JPS54128498A (en) | 1978-03-29 | 1978-03-29 | Treating method for cobalt-containing iron oxide magnetic powder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54128498A true JPS54128498A (en) | 1979-10-05 |
Family
ID=12495937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3738178A Pending JPS54128498A (en) | 1978-03-29 | 1978-03-29 | Treating method for cobalt-containing iron oxide magnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54128498A (en) |
-
1978
- 1978-03-29 JP JP3738178A patent/JPS54128498A/en active Pending
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