Rare earth magnet and production process thereof
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United States of America Patent
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Aug 23, 2011
Grant Date -
Jan 7, 2010
app pub date -
Jun 30, 2009
filing date -
Jul 4, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
B phase as a main phase, and a grain boundary phase surrounding peripheries of the grains, in which R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb and Ho, and X is Fe or Fe with a part being substituted by Co; in which an element RH is more concentrated in the grain boundary phase than in the grains, in which the element RH is at least one element selected from the group consisting of Dy, Tb and Ho; and the element RH is present with a substantially constant concentration distribution from the surface part of the magnet to the central part of the magnet.
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