Forming curved wafer thin magnets from rare earth-cobalt alloy p

Details Forming curved wafer thin magnets from rare earth-cobalt alloy p Forming curved wafer thin magnets from rare earth-cobalt alloy p

1977-03-21

1978-08-08

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

294205, 29608, 75200, 75208R, 75226, 148103, 228186, 228265, 310 42, 310154, 310254, H02K 1502

Patent

active

041047877

ABSTRACT:
In a preferred embodiment thin curved rare earth-cobalt magnets supported on the interior surface of a steel casing are formed by hot isostatic compaction. Rare earth-cobalt powder is magnetically aligned and compacted to at least 65% of the theoretical density. The relatively strong, curved green compacts are positioned on a curved mandrel and placed in a closely fitting steel casing which is evacuated and sealed. The magnets are densified under isostatic gas pressure at elevated temperatures and bonded to the steel. The steel backing serves as an integral motor casing when such magnets are used in D.C. motors.

REFERENCES:
patent: 3615915 (1971-10-01), Luiten et al.
patent: 3663317 (1972-05-01), Westendorp
patent: 3761257 (1973-09-01), Dunn
"Application of Hot Pressing in Fabricating Radial Polarized SmCo Magnets," IEEE Mag., vol. 11, p. 1455: 1975.

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