Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1979-04-27
1980-07-22
Rutledge, L. Dewayne
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148121, 148 3157, H01F 102
Patent
active
042138027
ABSTRACT:
The reversible temperature coefficient of magnetization of a permanent magnet alloy is lowered by (a) heating the alloy at about 1200 degrees C. for 2 hours, (b) quenching the alloy in ice water, (c) heating the alloy at about 850 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 one hour, (g) lowering the temperature to about 400 degrees C. and heating for four hours, and (h) lowering the temperature to about 280 degrees C. and heating for 12 hours. The method is particularly effective in lowering the reversible temperature coefficient of magnetization of the permanent magnet alloy Sm.sub.2 Cu.sub.1.6 Zr.sub.0.16 Fe.sub.3.3 Co.sub.12.
REFERENCES:
"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., Paper presented 24th Annual 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. MAG-13, No. 5, Sep. 1977.
Bergner Robert L.
Leupold Herbert A.
Rothwarf Frederick
Tauber Arthur
Edelberg Nathan
Gordon Roy E.
Kanars Sheldon
Rutledge L. Dewayne
Sheehan John P.
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