RARE EARTH SINTERED MAGNET, AND METHOD OF IMPROVING MECHANICAL STRENGTH AND CORROSION RESISTANCE TH

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PROBLEM TO BE SOLVED : To provide an R-T-B system rare earth sintered magnet having a high mechanical strength and an excellent corrosion resistance. SOLUTION : The R-T-B system rare earth sintered magnet according to the present invention comprises a sintered body including a main phase consisting of an R2T14B phase where R represents one or more sorts of rare earth elements and T represents one or more sorts of transition metal elements essentially containing Fe, or Fe and Co, and a grain boundary phase containing a higher amount of R than the main phase, wherein a surface of the sintered body is partially covered with a carbon compound layer. In the R-T-B system rare earth sintered magnet according to the present invention, an area ratio of the partial surface of the sintered body covered with the carbon compound layer to the entire surface thereof is preferably between 10% and 90%. And, it is desirable that a carbon compound is configured by RC0.4.