Method of making a laminated rare earth metal-cobalt permanent m

Details Method of making a laminated rare earth metal-cobalt permanent m Method of making a laminated rare earth metal-cobalt permanent m

1976-10-15

1978-02-28

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3157, 148105, 148108, 264 60, H01F 102

Patent

active

040765610

ABSTRACT:
In a preferred embodiment thin layers of rare earth metal-cobalt powder comprising an outer layer of RCo.sub.5 and a discrete transitional layer of R.sub.2 Co.sub.17 are compressed against an adjacent thicker layer of iron powder to form a laminated green compact, with the rare earth-cobalt powdered material being magnetically aligned. The green laminate body is then sintered to densify the rare earth-cobalt material layer to a body wherein the pores are substantially noninterconnecting. The laminate structure is then magnetized. By this method a strong rare earth-cobalt (RCo.sub.5) permanent magnet body is produced in which the rare earth-cobalt layer may be very thin (of the order of 1 to 2 millimeters) but of relatively large surface area and supported by a strong iron layer so as to be durable in handling, manufacturing and use.
It is possible to press an RCo.sub.5 layer directly onto a powdered iron layer when the oxygen content of the iron is suitably low. The method will also produce an R.sub.2 Co.sub.17 -iron composite.

REFERENCES:
patent: 3502584 (1970-03-01), Denes
patent: 3784945 (1974-01-01), Baermann
patent: 3887395 (1975-06-01), Martin
patent: 3892603 (1975-07-01), Reid
Strnat, K; Cobalt-Rare Earth Alloys as ... Perm. Mag. Materials, in Cobalt, 36, Sept. 1967, pp. 133-143.

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