Permanent magnets

Details Permanent magnets Permanent magnets

1989-05-02

1991-06-11

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, 252 6253, H01F 1053

Patent

active

050229397

ABSTRACT:
A permanent magnet material having high coercivity and energy product is provided which contains rare earth elements, boron, at least one element of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, optional nickel, and a balance of Fe or Fe and Co, and consists of a primary phase of substantially tetragonal grain structure, or a mixture of such a primary phase and an amorphous or crystalline rare earth element-poor auxiliary phase wherein the volume ratio of auxiliary phase to primary phase has a specific relationship to other parameters.

REFERENCES:
patent: 4802931 (1989-02-01), Croat
Journal of Less-Common Metals, 115 (1986), pp. 357-366, "Phase Relationships, Magnetic and Crystallographic Properties of Nd-Fe-B Alloys", K. H. J. Buschow et al.
IEEE Transaction on Magnetics, vol. Mag-21, No. 5, Sep., 1985, pp. 1955-1957.
"Analytical Microscope Studies of Sintered Nd-Fe-B Magnets", J. Fidler et al.
J. Fidler et al, Paper No. 19P0103 at the 10th International Workshop on Rare-Earth Magnets and Their Applications, Kyoto, Japan, May 16-19, 1989.
J. Appl. Phys., vol. 64, pp. 5528-5530 (1988), Nov. 15.
Abstract, 4th Joint MMM-Intermag Conference, Jul. 7-15, 1988.

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