High remanence hot pressed magnets

Details High remanence hot pressed magnets High remanence hot pressed magnets

1993-11-05

1996-05-07

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148101, 419 12, H01F 1057

Patent

active

055142249

ABSTRACT:
Isotropic hot pressed iron-rare earth metal permanent magnets are provided wherein the hot pressed permanent magnet exhibits magnetic remanences of at least about 9 kG, and most typically about 10 kG. Preferred compositions include a relatively low rare earth content coupled with an optimal amount of boron. The preferred composition is, on a weight percent basis, from about 5 to about 25 percent rare earth, most preferably about 10 to about 20 percent rare earth, from about 0.5 to about 4.5 percent boron, most preferably from about 0.8 to about 4.0 percent boron, wherein the total combination of the rare earths and boron ranges from about 9 percent to about 26 percent, most preferably from about 12 percent to about 22 percent, and optionally from about 2 percent to about 16 percent cobalt, with the balance being essentially iron.

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Takahashi et al, "The Magnetic Properties of Nd-Fe-B Melt-Spun Ribbons with Lower Nd Content", Transactions of the Institute of Electrical Engineers of Japan, vol. 113-A, No. 4, 1993, pp. 251-260.
Li et al, "Magnetic Properties and Phase Compositions of Rapidly Quenched Nd.sub.4 Fe.sub.96-x B.sub.x After Crystallization", Hyperfine Interactions, vol. 72 (1992), pp. 111-121.
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Hirosawa et al., "High-coercivity . . . rare-earth permanent magnet material based on (Fe,Co).sub.3 B-Nd-M (M=Al,Si,Cu,Ga,Ag,Au)"; J. Appl. Phys. 73(10), 15 May 1993.

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