Rare earth sintered magnet

Details Rare earth sintered magnet Rare earth sintered magnet

2005-11-17

2010-06-22

Sheehan, John P (Department: 1793)

Metal treatment

Stock

Magnetic

C148S301000, C148S302000, C075S244000, C428S900000

Reexamination Certificate

active

07740716

ABSTRACT:
The present invention provides a technique to improve an adhesion strength between a magnet main body and a protective film. The rare earth sintered magnet of the present invention comprises a magnet main body of a sintered body containing a rare earth element and a protective film formed on the magnet main body, wherein the ratio of a 10-point average surface roughness Rz of the magnet main body on which the protective film is formed to a mean grain size D50 in the magnet main body (Rz/D50 ratio) is kept in a range from 0.20 to 10.00, inclusive. This gives the rare earth sintered magnet which is coated with the protective film having a high adhesion strength of 100 N/m or more and exhibits high corrosion resistance.

REFERENCES:
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patent: 5316595 (1994-05-01), Hamada et al.
patent: 2004/0189426 (2004-09-01), Hidaka et al.
patent: 2005/0028892 (2005-02-01), Sasaki
patent: 7-66032 (1995-03-01), None
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patent: 11-97223 (1999-04-01), None
patent: 11-307328 (1999-11-01), None
patent: 2003-257721 (2003-09-01), None
patent: 2004-253742 (2004-09-01), None
patent: 2005-150572 (2005-06-01), None
Machine Translation of Japanese Patent Publication 2004-253742.

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