Method of treating Sm.sub.2 Co.sub.17 -based permanent magnet al

Details Method of treating Sm.sub.2 Co.sub.17 -based permanent magnet al Method of treating Sm.sub.2 Co.sub.17 -based permanent magnet al

1980-05-02

1981-06-30

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3157, H01F 102

Patent

active

042760976

ABSTRACT:
The reversible temperature coefficient of magnetization of a permanent magnet alloy over the temperature range from -50 degrees C. to +150 degrees C. is lowered by heat treating the alloy in a noble gas atmosphere or in a vacuum by the steps of
(a) heating the alloy at about 1150 degrees C. for 1.5 hours (b) quenching the alloy in ice water, (c) heating the alloy at about 940 degrees C. for 2 hours, (d) lowering the temperature to about 700 degrees C. and heating for one hour, (e) lowering the temperature to about 600 degrees C. and heating for one hour, (f) lowering the temperature to about 500 degrees C. and heating for 2 hours, and (g) lowering the temperature to about 400 degrees C. and heating for 10 hours.

REFERENCES:
patent: 4213802 (1980-07-01), Rothwarf et al.
"Enhancement of the Magnetic Properties of the Sm.sub.2 Cu.sub.1.6 Zr.sub16 Fe.sub.3.3 Co.sub.12, Compound", Bergner et al, Conference on Magnetism and Magnetic Materials, Cleveland, Ohio, Nov. 15, 1978.
Magnetic Properties of a New Type of Rare-Earth Cobalt Magnets", Ojima et al., IEEE Transactions on Magnetics, vol. 66-13, No. 5, Sep. 1977.

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