Method for the preparation of a rare earth-cobalt based permanen

Details Method for the preparation of a rare earth-cobalt based permanen Method for the preparation of a rare earth-cobalt based permanen

1983-04-04

1985-02-05

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148103, 148104, H01F 102

Patent

active

044976720

ABSTRACT:
The permanet magnet composed of a rare earth element, e.g. samarium, and cobalt together with iron, copper and some other additive elements and prepared according to the inventive method has a high coercive force and excellent squareness of the magnetic hysteresis loop despite the relatively low content of copper which has been considered to be indispensable for obtaining a high coercive force. The characteristic feature of the inventive method consists in the aging treatment of the sintered body of the alloy powder of a specified composition undertaken in two or more steps, each being carried out by continuously cooling the sintered body within a specified temperature range at a specified cooling velocity.

REFERENCES:
patent: 3998669 (1976-12-01), Strnat
patent: 4210471 (1980-07-01), Yoneyama et al.
patent: 4276097 (1981-06-01), Bergner et al.

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