| 简介 |
A permanent magnet includes : a composition expressed by a composition formula : RpFeqMrCutCo100-p-q-r-t (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5 ≤ p ≤ 12.5 at%, 23 ≤ q ≤ 40 at%, 0.88 ≤ r ≤ 4.5 at%, 4.5 ≤ t ≤ 10.7 at%); and a metal structure containing a Th2Zn17 crystal phase and a Cu-rich phase having a Cu concentration higher than that of the Th2Zn17 crystal phase. In a cross section including a c-axis of the Th2Zn17 crystal phase, a number of intersections of the Cu-rich phases existing in an area of 1 µm square is 10 or more. |
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