| 简介 |
PROBLEM TO BE SOLVED : To provide a rare-earth magnet of which the high-temperature demagnetization rate is suppressed even in the case where the quantity of heavy rare earth elements such as Dy and Tb to be used is reduced significantly more than the prior arts or such heavy rare earth elements are not used.
SOLUTION : The rare-earth magnet is a sintered magnet containing R2T14B crystal grains of a main phase and a grain boundary phase between the R2T14B crystal grains. When cross-sectional area distribution of the main phase crystal grains is evaluated by a histogram on any arbitrary cross section, crystal grains of a large grain size and crystal grains of a small grain size are controlled in such a manner that the cross-sectional area distribution becomes distribution having at least one peak at both sides of an average value of a cross-sectional area.
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