R-T-B-BASED SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide an R-T-B-based sintered magnet excellent in coercive force at high temperature even when a usage amount of a heavy rare-earth element such as Dy, Tb is significantly reduced than before, or it is not used at all. SOLUTION : The R-T-B-based sintered magnet includes : an R2T14B main phase crystal particles 2; and an Fe rich phase 4 other than the main phase crystal particles, whose Fe content is higher than the main phase crystal particles, containing R. An area ratio of the Fe rich phase 4 to a cross-sectional area of the R-T-B-based sintered magnet is greater than or equal to 0.05% and less than or equal to 1.0%. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2016, JPO&INPIT