Sintered magnet and method for making

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

1994-12-27

1997-06-24

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148103, 419 12, H01F 103

Patent

active

056413637

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: 4898625 (1990-02-01), Otsuka et al.
patent: 5209789 (1993-05-01), Yoneyama et al.
patent: 5309977 (1994-05-01), Yoneyama et al.
Abstracts of the Japan Institute of Metals, Oct. 8-10, 1994, 2 pages.
"Near Net-Shaped Nd-Fe-B Sintered Magnet", Oct. 8, 1994, Akira Fukuno, et al., 2 pages.

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