R-T-B-C based rare-earth magnetic powder and bonded magnet

Details R-T-B-C based rare-earth magnetic powder and bonded magnet R-T-B-C based rare-earth magnetic powder and bonded magnet

2008-01-08

2008-01-08

Sheehan, John P (Department: 1742)

Metal treatment

Stock

Magnetic

C148S302000, C148S101000, C148S121000, C420S083000, C420S121000

Reexamination Certificate

active

07316752

ABSTRACT:
The step of preparing a rapidly solidified alloy by rapidly quenching a melt of an R-T-B-C based rare-earth alloy (where R is at least one of the rare-earth elements including Y, T is a transition metal including iron as its main ingredient, B is boron, and C is carbon) and the step of thermally treating and crystallizing the rapidly solidified alloy are included. The step of thermally treating results in producing a first compound phase with an R2Fe14B type crystal structure and a second compound phase having a diffraction peak at a site with an interplanar spacing d of 0.295 nm to 0.300 nm (i.e., where 2θ=30 degrees). An intensity ratio of the diffraction peak of the second compound phase to that of R2Fe14B type crystals representing a (410) plane is at least 10%. The present invention provides an R-T-B-C based rare-earth alloy magnetic material, including carbon (C) as an indispensable element but exhibiting excellent magnetic properties, and makes it possible to recycle rare-earth magnets.

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