R-T-B based rare earth permanent magnet and method for...

Details R-T-B based rare earth permanent magnet and method for... R-T-B based rare earth permanent magnet and method for...

2004-06-24

2009-11-17

Sheehan, John P. (Department: 1793)

Metal treatment

Stock

Magnetic

C075S244000, C419S012000

Reexamination Certificate

active

07618497

ABSTRACT:
An R-T-B system rare earth permanent magnet, which comprises main phase grains consisting of R2T14B compounds and a grain boundary phase having a higher amount of R than the above described main phase grains, and which satisfies AVE(X)/Y=0.8 to 1.0; and (X/Y)max/(X/Y)min=2.0 to 13.0, wherein X represents (weight ratio of heavy rare earth elements)/(the weight ratio of all rare earth elements) for a given number of the above described main phase grains Y represents (weight ratio of heavy rare earth elements)/(weight ratio of all rare earth elements) for the sintered body as a whole; AVE(X) represents the mean value of X obtained for the given number of main phase grains; (X/Y)min represents the minimum value of (X/Y) obtained for the given number of main phase grains; and (X/Y)max represents the maximum value of (X/Y) obtained for the given number of main phase grains.

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