Metal treatment – Stock – Magnetic
Patent
1996-02-22
1999-03-02
Zirker, Daniel
Metal treatment
Stock
Magnetic
343547, 343553, 427127, H01F 1053, H01F 1057
Patent
active
058765182
ABSTRACT:
An R-T-B-based, permanent magnet with improved resistance to the deterioration of magnetic properties by working, electroplating, etc. and to their change with time, wherein R is one or more of rare earth elements including Y, and T is Fe, part of which may be substituted by Co, has (a) a corrosion-resistant film layer having an average thickness of 5 .mu.m or more on a surface of a sintered magnet having a composition consisting essentially of 20-45 weight % of R, 15 weight % or less of Co, 0.5-6 weight % of B, and 10 weight % or less of M selected from the group consisting of Al, Si, Nb, Mo, V, Mn, Sn, Ni, Zn, Ti, Cr, Ta, W, Ge, Zr, Hf and Ga, the balance being substantially Fe and inevitable impurities, and (b) a layer richer in rare earth elements than a main phase of R.sub.2 Fe.sub.14 B beneath the corrosion-resistant film layer.
REFERENCES:
patent: 4837114 (1989-06-01), Hamada et al.
patent: 4942098 (1990-07-01), Hamamura et al.
patent: 5269855 (1993-12-01), Ueda et al.
Hasegawa Motohisa
Sasaki Takashi
Hitachi Metals Ltd.
Zirker Daniel
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