Anisotropic neodymium-iron-boron permanent magnets formed at red

Details Anisotropic neodymium-iron-boron permanent magnets formed at red Anisotropic neodymium-iron-boron permanent magnets formed at red

1992-01-21

1993-05-18

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 11, 419 12, 419 14, 419 15, 419 16, 419 17, H01F 102

Patent

active

052117669

ABSTRACT:
Additions of carbon or tantalum ranging between about 0.1 to about 0.15 weight percent are added to an iron-rare earth metal permanent magnet alloy. The permanent magnet alloy contains the magnetic phase consisting of Fe.sub.14 Nd.sub.2 B (or the equivalent) tetragonal crystals, which is primarily based on neodymium and/or praseodymium, iron and boron. The isotropic melt-spun ribbons of the preferred alloy are characterized by generally improved magnetic properties. The anisotropic magnetic bodies formed from these ribbons are hot worked at temperatures substantially lower than the conventional alloy which does not contain the carbon or tantalum additions, with an improvement in magnetic properties observed.

REFERENCES:
patent: 4792367 (1988-12-01), Lee
patent: 4802931 (1989-02-01), Croat
patent: 4952239 (1990-08-01), Tokunaga et al.
patent: 4983232 (1991-01-01), Endoh et al.

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