Alloying low-level additives into hot-worked nd-fe-b magnets

Details Alloying low-level additives into hot-worked nd-fe-b magnets Alloying low-level additives into hot-worked nd-fe-b magnets

H - Electricity

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75/160, 148/5, 5

H01F 1/053 (2006.01) C22C 1/02 (2006.01) C22C 1/04 (2006.01) C22C 30/00 (2006.01) H01F 1/057 (2006.01) H01F 1/08 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2023924

ALLOYING LOW-LEVEL ADDITIVES INTO HOT-WORKED Nd-Fe-B MAGNETS Abstract of the Disclosure Diffusion alloying techniques are used to introduce low level additives into hot-worked Nd-Fe-B magnets. The powdered metal is added to the rapidly solidified ribbons of the magnetic alloy prior to hot working. Diffusion alloying during hot-working permits the final chemistry of the magnet and more specifically the grain boundaries to be determined during the final processing steps. Elements which diffuse into the matrix, such as zinc, copper and nickel, enhance the coercivity by as much as 100 percent in die-upset magnets. At optimum levels, approximately 0.5-0.8 weight percent, the additives did not diminish the remanence or energy product of the magnet.

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