JPS54125496A - Rare earth permanent magnet and method for manufacturing the same - Google Patents
Rare earth permanent magnet and method for manufacturing the sameInfo
- Publication number
- JPS54125496A JPS54125496A JP3339278A JP3339278A JPS54125496A JP S54125496 A JPS54125496 A JP S54125496A JP 3339278 A JP3339278 A JP 3339278A JP 3339278 A JP3339278 A JP 3339278A JP S54125496 A JPS54125496 A JP S54125496A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- rare earth
- durability
- oxidation
- increasing
- 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
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To prevent the oxidation and improve the durability, by increasing the binder ratio at the outer surface of the rare earth magnet than in the inner part thereof.
CONSTITUTION: Ferromagnetic powder of an intermetallic compound formed from a rare earth element and an iron-family transition element (such as samarium-cobalt) is provided by high-frequency induction heating and ball mill grinding. Then a binder consisting of epoxy-resin having a viscosity of 200W10000 centipoise or the like is kneaded into this by an amount of 4% by weight, and the substance thus obtained is subjected to compression molding (1.5W7 t/cm2) in a magnetic field of 10000 Oe. Next, the molded article is heated at 150°C for 1 hour to be hardened, and then magnetized to form a rare earth magnet. When the compression molding is effected at a pressure of more than 1.5 t/cm2, the binder moves to the outer surface of the article to make the surface binder concetration large, so that the oxidation is prevented and the durability can be improved. Alternatively, the binder concentration at the surface can also be increased by immersing the molded article into the binder and then increasing or decreasing the pressure.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3339278A JPS54125496A (en) | 1978-03-23 | 1978-03-23 | Rare earth permanent magnet and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3339278A JPS54125496A (en) | 1978-03-23 | 1978-03-23 | Rare earth permanent magnet and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54125496A true JPS54125496A (en) | 1979-09-28 |
Family
ID=12385310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3339278A Pending JPS54125496A (en) | 1978-03-23 | 1978-03-23 | Rare earth permanent magnet and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54125496A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63244704A (en) * | 1987-03-31 | 1988-10-12 | Seiko Epson Corp | Manufacture of resin-bonded rare earth/iron magnet |
| CN101962722A (en) * | 2010-10-15 | 2011-02-02 | 北京工业大学 | Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5083797A (en) * | 1973-11-28 | 1975-07-07 |
-
1978
- 1978-03-23 JP JP3339278A patent/JPS54125496A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5083797A (en) * | 1973-11-28 | 1975-07-07 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63244704A (en) * | 1987-03-31 | 1988-10-12 | Seiko Epson Corp | Manufacture of resin-bonded rare earth/iron magnet |
| CN101962722A (en) * | 2010-10-15 | 2011-02-02 | 北京工业大学 | Method for preparing single-phase SmCo7 nanocrystalline alloy block material without doping elements |
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