JPS644001A - Manufacture of magnetic powder for magnetic recording medium - Google Patents
Manufacture of magnetic powder for magnetic recording mediumInfo
- Publication number
- JPS644001A JPS644001A JP62157796A JP15779687A JPS644001A JP S644001 A JPS644001 A JP S644001A JP 62157796 A JP62157796 A JP 62157796A JP 15779687 A JP15779687 A JP 15779687A JP S644001 A JPS644001 A JP S644001A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- magnetic powder
- oxidation treatment
- powder
- water
- 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
Abstract
PURPOSE:To enhance the saturated magnetization and to reduce its deterioration rate by a method wherein, after a metal compound of nickel or cobalt is added to an oxidizable magnetic powder, this mixture is baked and, after that, it is oxidized while the temperature is raised step by step. CONSTITUTION:A metal compound of at least one out of nickel and cobalt is added to an oxidizable magnetic powder; a pH value is adjusted by using an alkalizing agent; they are mixed in the water. Then, the mixture is filtered; water adhering to a filtered substance is dried; the filtered substance containing crystalline water is dehydrated and is heat-treated. A temperature of the magnetic powder which has been treated in this manner is raised step by step; the powder is oxidized. For this oxidation treatment, several step-by-step temperature levels are decided for a temperature-raising process, e.g. from 40 deg.C to 140 deg.C, preferably from 60 deg.C to 120 deg.C; a heating and oxidation process is executed mainly at each treatment level. The saturated magnatization is enhanced after the oxidation treatment at a low temperature level; a deterioration rate of the saturated magnetization is reduced after the oxidation treatment at a high temperature level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62157796A JPH0618131B2 (en) | 1987-06-26 | 1987-06-26 | Method for producing magnetic powder for magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62157796A JPH0618131B2 (en) | 1987-06-26 | 1987-06-26 | Method for producing magnetic powder for magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS644001A true JPS644001A (en) | 1989-01-09 |
JPH0618131B2 JPH0618131B2 (en) | 1994-03-09 |
Family
ID=15657474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62157796A Expired - Lifetime JPH0618131B2 (en) | 1987-06-26 | 1987-06-26 | Method for producing magnetic powder for magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0618131B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH038906A (en) * | 1989-06-05 | 1991-01-16 | Nippon Hodo Co Ltd | Execution device for inclination |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5698401A (en) * | 1980-01-10 | 1981-08-07 | Mitsui Toatsu Chem Inc | Ferromagnetic metal powder with improved oxidation stability and preparation thereof |
JPS58159306A (en) * | 1982-03-17 | 1983-09-21 | Hitachi Maxell Ltd | Manufacture of metallic magnetic powder |
JPS60128202A (en) * | 1983-12-13 | 1985-07-09 | Toyo Soda Mfg Co Ltd | Production of magnetic metallic powder |
JPS60221325A (en) * | 1984-04-13 | 1985-11-06 | Hitachi Maxell Ltd | Iron nitride-based ferromagnetic powder excellent in corrosion resistance and its manufacture |
-
1987
- 1987-06-26 JP JP62157796A patent/JPH0618131B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5698401A (en) * | 1980-01-10 | 1981-08-07 | Mitsui Toatsu Chem Inc | Ferromagnetic metal powder with improved oxidation stability and preparation thereof |
JPS58159306A (en) * | 1982-03-17 | 1983-09-21 | Hitachi Maxell Ltd | Manufacture of metallic magnetic powder |
JPS60128202A (en) * | 1983-12-13 | 1985-07-09 | Toyo Soda Mfg Co Ltd | Production of magnetic metallic powder |
JPS60221325A (en) * | 1984-04-13 | 1985-11-06 | Hitachi Maxell Ltd | Iron nitride-based ferromagnetic powder excellent in corrosion resistance and its manufacture |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH038906A (en) * | 1989-06-05 | 1991-01-16 | Nippon Hodo Co Ltd | Execution device for inclination |
Also Published As
Publication number | Publication date |
---|---|
JPH0618131B2 (en) | 1994-03-09 |
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