Sintered magnet and method for making

Details Sintered magnet and method for making Sintered magnet and method for making

1997-03-25

1998-11-10

Sheehan, John

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

148302, 148104, 419 12, C22C 2914

Patent

active

058346635

ABSTRACT:
In the manufacture of a rare earth sintered magnet of the Nd.sub.2 Fe.sub.14 B system, closed voids are formed in the magnet in a predetermined fraction to minimize shrinkage. Unlike open voids or pores in conventional semi-sintered magnets, the closed voids do not incur magnet corrosion since they do not communicate to the magnet exterior. By minimizing shrinkage during sintering in this way, a ring or plate-shaped thin wall anisotropic magnet can be prepared without machining for shape correction, achieving a cost reduction and a productivity improvement. Since a high density compact has a high deflective strength, it is easy to handle, minimizing cracking and chipping between the compacting and sintering steps.

REFERENCES:
patent: 4921531 (1990-05-01), Nagle et al.
patent: 4952252 (1990-08-01), Ghandehari
patent: 5057148 (1991-10-01), Micheli et al.
patent: 5536334 (1996-07-01), Kabayashi et al.
Akira Fukuno, et al, "Near-Shaped ND-FE-B Sintered Magnet", Abstracts of the Japan Institute of Metals, 1 page, Oct. 8, 1994 (with English translation).

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