C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/5
C22F 1/02 (2006.01) C22F 1/16 (2006.01) H01F 1/055 (2006.01)
Patent
CA 1124621
Abstract of the Disclosure 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 Sm2Cu1.6Zr0.16Fe3.3Co12.
344173
Bergner Robert L.
Leupold Herbert A.
Rothwarf Frederick
Tauber Arthur
Aspila Kalevi P.
The Government Of The United States As Represented By The Secret
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