Method of treating a permanent magnet alloy

C - Chemistry – Metallurgy – 22 – F

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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.

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