Permanent magnetic alloy and bonded magnet

Details Permanent magnetic alloy and bonded magnet Permanent magnetic alloy and bonded magnet

2006-04-04

2006-04-04

Sheehan, John P. (Department: 1742)

Compositions

Magnetic

With wax, bitumen, resin, or gum

C148S302000, C148S101000, C420S083000, C420S121000, C164S463000

Reexamination Certificate

active

07022252

ABSTRACT:
The permanent magnetic alloy of the present invention comprises an R—Fe—B alloy wherein R is at least one element selected from rare earth elements including Y. The R—Fe—B alloy has a composition mainly comprising Fe, substantially containing no N, and containing 4 at. % or more of B. The permanent magnetic alloy substantially comprises a TbCu7hard magnetic phase (main phase) and a fine crystal having an average crystal grain size of less than 5 nm and/or an amorphous phase, and has high magnetic properties.

REFERENCES:
patent: 5716462 (1998-02-01), Sakurada et al.
patent: 5968289 (1999-10-01), Sakurada et al.
patent: 5968290 (1999-10-01), Sakurada et al.
patent: 6406559 (2002-06-01), Sakurada et al.
patent: 6468440 (2002-10-01), Sakurada et al.
patent: WO 99/50857 (1999-10-01), None

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