Alloy for Fe Nd B type permanent magnet, sintered permanent magn

Details Alloy for Fe Nd B type permanent magnet, sintered permanent magn Alloy for Fe Nd B type permanent magnet, sintered permanent magn

1990-11-26

1992-06-23

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, H01F 1053

Patent

active

051239795

ABSTRACT:
The invention relates to Fe Nd B type alloys for permanent magnets, the permanent magnets thus obtained and a method of producing them.
They have high magnetic characteristics with good temperature resistance and good resistance to atmospheric corrosion.
They comprise, in at%, 12 to 18% of rare earths, 3 to 30% of Co, 5.9 to 12% of B, 2 to 10% of V, some Al and Cu, the remainder being iron and unavoidable impurities. The V can be substituted by other refractory elements (Nb, W, Cr, Mo, Ti, Zr, Hf, Ta).
The method mainly involves sintering at between 1050 and 1110.degree. C. followed by annealing at between 850 and 1050.degree. C. and/or artificial ageing at between 560.degree. C. and 850.degree. C.

REFERENCES:
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 5015307 (1991-05-01), Shimotomai et al.

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