| 简介 |
[Problem] To provide an R-T-B sintered magnet which maintains high magnetic characteristics and reduces the amount of heavy rare-earth elements used. [Solution] This R-T-B sintered magnet is characterized by having main phase particles and a grain boundary phase, wherein the main phase particles include a core and a shell. In the core main phase LR(2-x)HRxT14B (LR : light rare-earth elements requiring Nd and including at least one of Y, La, Ce, Pr and Sm; HR : heavy rare-earth elements requiring Dy and/or Tb, and including at least one of Gd, Ho, Er, Tm, Yb and Lu; T : requires Fe and/or Co, and includes one or both Mn and Ni; B : (includes substances substituted with boron or a portion C (carbon)), x is 0.00-0.07; in the shell main phase LR(2-x)HRxT14B, x is 0.02-0.40, and the maximal thickness of the shell is 7-100nm. |
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