Permanent magnet having improved heat-treatment characteristics

Details Permanent magnet having improved heat-treatment characteristics Permanent magnet having improved heat-treatment characteristics

1989-05-23

1991-02-26

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75246, 419 12, 419 29, 419 60, 148302, C22C 2914

Patent

active

049959050

ABSTRACT:
When V is added to an Nd--Fe--B sintered magnet so as to modify 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 phases but forms a finely dispersed V--T--B compound minority phase (T is Fe, and in a case containing Co, T is Fe and Co), the coercive force (iHc) is enhanced to 15 kOe or more but becomes very sensitive to heat treatment temperature. This drawback is eliminated by the addition of from 0.01 to 1 at % of Cu.

REFERENCES:
patent: 4684406 (1987-09-01), Matsuura et al.
patent: 4765848 (1988-08-01), Mohri et al.
patent: 4770702 (1988-09-01), Ishigaki et al.
patent: 4770723 (1988-09-01), Sagawa et al.
patent: 4773950 (1988-09-01), Fujimura et al.

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