JPS54124297A - Ferromagnetic powder - Google Patents
Ferromagnetic powderInfo
- Publication number
- JPS54124297A JPS54124297A JP3254478A JP3254478A JPS54124297A JP S54124297 A JPS54124297 A JP S54124297A JP 3254478 A JP3254478 A JP 3254478A JP 3254478 A JP3254478 A JP 3254478A JP S54124297 A JPS54124297 A JP S54124297A
- Authority
- JP
- Japan
- Prior art keywords
- cobalt
- iron
- ferrous
- atmosphere
- magnetic
- 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
Abstract
PURPOSE: To provide ferromagnetic powder which is improved in the resistance to magnetic force and in the magnetic stability, and which is produced by heat-treating magnetic iron oxide powder coated with compounds containing cobalt and iron ions in an antioxdizing atmosphere.
CONSTITUTION: A solution containing cobalt and ferrous iron ions (such as cobalt sulfate and ferrous sulfate) is added to water in which ferromagnetic iron oxide powder (γ-Fe2O3) is dispersed. The amount of cobalt is 0.5 to 10% by atom of the total iron, and the amount of the ferrous iron ions is no more than 50% by atom of the total iron. Then to the obtained slurry is added an aqueous NaOH solution to render the slurry to be an alkalinity of 0.5 to 2N. The mixture is heated to react at 60 to 120°C for 5 minutes to 4 hours, cooled, washed with water and dried to obtain ferromagnetic powder coated with the compounds of cobalt and ferrous ions. Up to the washing stage the procedures must be carried out in an antioxidizing atmosphere. Finally, the magnetic powder is processed to be heated at 120 to 250°C for 30 minutes to 3 hours in a N2 atmosphere.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3254478A JPS54124297A (en) | 1978-03-20 | 1978-03-20 | Ferromagnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3254478A JPS54124297A (en) | 1978-03-20 | 1978-03-20 | Ferromagnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54124297A true JPS54124297A (en) | 1979-09-27 |
Family
ID=12361866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3254478A Pending JPS54124297A (en) | 1978-03-20 | 1978-03-20 | Ferromagnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54124297A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161927A (en) * | 1982-03-19 | 1983-09-26 | Sony Corp | Manufacture of magnetic powder |
| JPS614202A (en) * | 1984-06-19 | 1986-01-10 | Sony Corp | Manufacture of magnetic powder made of acicular ferromagnetic iron oxide |
| JPS61266311A (en) * | 1985-05-21 | 1986-11-26 | Agency Of Ind Science & Technol | Discoid ferromagnetic powder and its production |
| JPS62274605A (en) * | 1986-05-13 | 1987-11-28 | バスフ アクチェン ゲゼルシャフト | Manufacture of needle shape magnetic iron oxide containing cobalt |
| US4944985A (en) * | 1988-04-11 | 1990-07-31 | Leach & Garner | Method for electroless plating of ultrafine or colloidal particles and products produced thereby |
-
1978
- 1978-03-20 JP JP3254478A patent/JPS54124297A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161927A (en) * | 1982-03-19 | 1983-09-26 | Sony Corp | Manufacture of magnetic powder |
| JPH034489B2 (en) * | 1982-03-19 | 1991-01-23 | Sony Corp | |
| JPS614202A (en) * | 1984-06-19 | 1986-01-10 | Sony Corp | Manufacture of magnetic powder made of acicular ferromagnetic iron oxide |
| JPS61266311A (en) * | 1985-05-21 | 1986-11-26 | Agency Of Ind Science & Technol | Discoid ferromagnetic powder and its production |
| JPS62274605A (en) * | 1986-05-13 | 1987-11-28 | バスフ アクチェン ゲゼルシャフト | Manufacture of needle shape magnetic iron oxide containing cobalt |
| US4944985A (en) * | 1988-04-11 | 1990-07-31 | Leach & Garner | Method for electroless plating of ultrafine or colloidal particles and products produced thereby |
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