Permanent magnets and method of making

Details Permanent magnets and method of making Permanent magnets and method of making

1988-04-04

1991-12-03

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75228, 75244, 419 19, 428570, 428469, C22C 2912

Patent

active

050697137

ABSTRACT:
A non-sintered permanent magnet is formed by a cold compacting technique or by resin bonding using particles of a stoichiometric alloy (e.g. R.sub.2 Fe.sub.14 B where R is at least one rare earth and/or yttrium, particularly La, Ce, Pr, ND or Y or a mixture thereof) which have been coated with a reaction product of the alloy or a non-magnetic metal such as Sn, Ga, Zn, Al, or Cu. The use of a stoichiometric alloy avoids the presence of a reactive grain boundary phase normally present in non-stoichiometric alloys.

REFERENCES:
patent: 4200547 (1980-04-01), Beck
patent: 4431604 (1984-02-01), Sata et al.
patent: 4543208 (1985-09-01), Horie et al.
patent: 4837114 (1989-06-01), Hamada et al.
patent: 4854979 (1989-08-01), Wecker
patent: 4865915 (1989-09-01), Okonogi et al.
A. L. Robinson, "Powerful New Magnet Material Found", Science, vol. 223, Mar. 84, pp. 920-922.

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