Permanent magnet materials

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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75134M, 75152, C22C 1900

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active

042240670

ABSTRACT:
Compounds of the general formula Sm.sub.2-x RE.sub.x Co.sub.17-y Mn.sub.y are provided wherein RE is a rare earth element selected from the group consisting of erbium, dysprosium and gadolinium wherein x has a value greater than zero and less than 0.7 and wherein y has a value less than 2.1. The compounds are suitable for use as permanent magnet material in microwave/millimeter-wave traveling wave tubes (TWT's).

REFERENCES:
patent: 3615911 (1971-10-01), Nesbitt et al.
patent: 3723197 (1973-03-01), Buschow et al.
patent: 3887395 (1975-06-01), Martin
patent: 3901741 (1975-08-01), Benz et al.
patent: 3997371 (1976-12-01), Tokunaga et al.
"Temperature Dependence of the Magnetic Parameters in the Sm.sub.2-x Gd.sx Co.sub.17-y Mn.sub.y Compounds", Bergner et al., paper presented Nov. 15, 1978, at 24th annual Conference on Magnetism and Magnetic Materials, Cleveland, Ohio.

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