Permanent magnet and method for producing the same

Details Permanent magnet and method for producing the same Permanent magnet and method for producing the same

1989-03-09

1991-03-19

Dean, R.

Metal treatment

Stock

Magnetic

420 83, H01F 1053

Patent

active

050008005

ABSTRACT:
An Nd-Fe-B sintered magnet which has 0.5 %/.degree.C. or more of temperature-coefficient of coercive force (iHc) and a composition that R=11-18 at % (R is one or more rare-earth elements except for Dy, with the proviso of 80 at % .ltoreq.(Nd+Pr)/R.ltoreq.100 at %), B=6-12 at %, and balance of Fe and Co (with the proviso of Co is 25 at % or less relative to the total of Co and Fe (including 0 % of Co)) and impurities, is improved to have 15 kOe or more of coercive force (iHc) by means of further containing 2-6 at % of V and modifying the minority phase such that B in excess of a stoichiometric composition of R.sub.2 Fe.sub.14 B compound-phase essentially does not form RFe.sub.4 B.sub.4 -compound minority phase but forms a finely dispersed V-T-B compound minority phase (T is fe, and in a case of containing Co, T is Fe and Co).

REFERENCES:
patent: 4601875 (1986-07-01), Yamamoto et al.
patent: 4684406 (1987-08-01), Matsuura et al.
patent: 4767474 (1988-08-01), Fujimura et al.
patent: 4770723 (1988-09-01), Sagawa et al.
patent: 4773950 (1988-09-01), Fujimura et al.
patent: 4792368 (1988-12-01), Sagawa et al.
Concerned European Action on Magnets Newsletter, report on Brighton General Meeting of April 20-21, 1990.
Sagawa, M. et al., "Improved Corrosion and Temperature Behavior of Nd-Fe-B Magnets", DC01 Interney, Brighton U.K., Apr. 1990.
Tevaud, P. et al., "Nouveaux Types D'Aimants NdFeB A Compartment Ameliore Vis a Vis de la Corrosion et de la Temperature", SEE Conference, Genoble, France, Jun. 1990.
Journal of Applied Physics, vol. 55, No. 6, Part IIA, Mar. 15, 1984, New Material for Permanent Magnets on a Base of Nd and Fe (invited), M. Sagawa et al.

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