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

1990-12-17

1991-08-06

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 148302, 419 12, 419 61, 419 65, H01F 102

Patent

active

050374923

ABSTRACT:
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 solidifed 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.

REFERENCES:
patent: 4765848 (1988-08-01), Mohri et al.
Nd-Fe-B Die-Upset and Anisotropic Bonded Magnets (invited), Nozawa et al., J. Appl. Phys., 64 (10), Nov. 15, 1988.
Coercivity Enhancement of Melt-Spun Nd-Fe-B Ribbons via Low-Level Transition Metal Substitutions, Herbst et al., Research Disclosure No. 30409, Aug. 1989.
Rowlinson et al., "New Developments in Bonded Nd-Fe-B Magnets", Journal of Magnetism and Magnetic Materials, 80, (1989), 93-96, North-Holland, Amsterdam.

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