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Fine powders by grinding Nd-Fe-B sintered magnet bulks (particle size=46-125μm in diameter) were coated and alloyed with Zn, Mg or Yb metal by sorbing them, for which the boiling points were low. Among these volatile metals, Yb showed a good ability to recover the decreased magnetic property of as-ground Nd-Fe-B powders, viz. ~0.95T for remanence (B r ), ~227kA/m for coercivity (H c ...
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