Process for producing a rare earth element-iron anisotropic magn

Details Process for producing a rare earth element-iron anisotropic magn Process for producing a rare earth element-iron anisotropic magn

1991-05-28

1993-01-12

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 52, H01F 102

Patent

active

051786915

ABSTRACT:
A process for producing a rare earth element-iron-boron anisotropic magnet that may generate a strong static magnetic field in vacant spaces of a magnetic circuit mounted in a motor is disclosed. The process comprises the steps of placing a billet produced of rapid solidification powder of a rare earth element-iron-boron alloy into a mold cavity, applying a primary pressure to said billet, while allowing a primary current to pass through said billet, applying to said billet a secondary pressure which is increased up to at least five times as much as the primary pressure, and applying a secondary current greater than the primary current through said billet, wherein the billet is finally subjected to plastic deformation at the temperature between the crystalline temperature and 750.degree. C.

REFERENCES:
patent: 2355954 (1944-08-01), Cremer
patent: 4792367 (1988-12-01), Lee
patent: 4844754 (1989-07-01), Lee

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