NdFeB system sintered magnet
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United States of America Patent
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Jun 7, 2016
Grant Date -
May 1, 2014
app pub date -
Dec 27, 2012
filing date -
Dec 27, 2012
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Abstract
A NdFeB system sintered magnet according to the present invention is a NdFeB system sintered magnet having a base material produced by orienting powder of a NdFeB system alloy and sintering the powder, with Dy and/or Tb (the “Dy and/or Tb” is hereinafter called RH) attached to and diffused from a surface of the base material through the grain boundary inside the base material by a grain boundary diffusion treatment, wherein the number of grain-boundary triple points at which the difference Ct−Cw between the RH content Ct (wt %) at the grain-boundary triple point and the RH content Cw (wt %) at a two-grain boundary portion leading to that grain-boundary triple point is equal to or smaller than 4 wt % is equal to or larger than 60% of the total number of grain-boundary triple points.
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