| 简介 |
PROBLEM TO BE SOLVED : To provide an R-T-B-based sintered magnet having sufficiently large practical adhesion strength to a protection film, even if the grain size of main-phase particles of R-T-B-based sintered magnet is 2.8 μm or less.
SOLUTION : An R-T-B-based sintered magnet having a R2T14B type compound prevents lowering of the adhesion strength of a protection film, when the average grain size of main-phase particles 1 of the R-T-B-based sintered magnet is decreased, by having rare earth oxide particles 5 having grain size larger than that of the main-phase particles 1, in a grain boundary 2 formed by main-phase particles 1 composed of three or more R2T14B type compounds.
SELECTED DRAWING : Figure 1
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