Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chikara Ishizaka0
Yasushi Enokido0
Gouichi Nishizawa0
Date of Patent
June 22, 2010
Patent Application Number
11576050
Date Filed
November 17, 2005
Patent Primary Examiner
Patent 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.
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