| 简介 |
[Problem] To provide a rare-earth sintered magnet with improved corrosion resistance. [Solution] This rare-earth sintered magnet is a rare-earth permanent magnet having an R-T-B composition (R is at least one type of element selected from Y and the rare-earth elements, T is at least one type of metal element including Fe or Fe and Co, and B is B or B and C), wherein during an R-rich phase (R is a rare-earth element), which is when the atom ratio at the grain-boundary triple point is (Fe+Co)/(LR+HR+Fe+Co)≤ 0.2 (LR is a light rare-earth element from Y and 57La to 63Eu, and HR is a heavy rare-earth element from 64Gd to 71Lu), a region HR/(LR+HR)≥0.01 (atom ratio) exists in the R-rich phase, the surface-area ratio within the region HR/(LR+HR)≥0.01 accounted for by the grain-boundary triple points being between 10% and 90%. |
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