Permanent magnet material and bonded magnet

Details Permanent magnet material and bonded magnet Permanent magnet material and bonded magnet

1998-03-27

1999-10-19

Sheehan, John

Metal treatment

Stock

Magnetic

148301, 252 6254, 428606, H01F 1057

Patent

active

059682906

ABSTRACT:
A permanent magnet material has a principal phase of TbCu7 type crystal structure and improved magnetic properties. This permanent magnet material is represented by the general formula: R1.sub.x R2.sub.y B.sub.z N.sub.u M.sub.100-x-y-z-u, wherein R1 is at least one rare earth element including Y, R2 is at least one element selected from the group consisting of Zr, Hf and Sc, M is at least one element selected from Fe and Co, x, y, z and u are atomic percents individually defined as x.gtoreq.2, y.gtoreq.0.01, 4.ltoreq.x+y.ltoreq.20, 0.ltoreq.z.ltoreq.10, and 0<u.ltoreq.20. The permanent magnet material has a principal phase of a TbCu.sub.7 type crystal structure. The permanent magnet material satisfies the relation of t.ltoreq.60 and .sigma./t.ltoreq.0.7, wherein t(nm) is an average crystal grain size of the principal phase and .sigma.(nm) is a standard deviation of the crystal grain size.

REFERENCES:
patent: 5480495 (1996-01-01), Sakurada et al.
patent: 5482573 (1996-01-01), Sakurada et al.
patent: 5549766 (1996-08-01), Tsutai et al.
patent: 5716462 (1998-02-01), Sakurada et al.
patent: 5750044 (1998-05-01), Yoneyama et al.

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