| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet which enables the reduction in high-temperature demagnetizing factor even in the case of largely reducing the amount of using a heavy rare earth element such as Dy or Tb in comparison to a conventional amount, or using no such a heavy rare earth element.
SOLUTION : A magnet composed of a sintered compact comprises : R2T14B crystal grains 1 making main phases; and grain boundary phases 3 between the R2T14B crystal grains. The sintered compact is controlled in its microstructure so that the grain boundary phases 3 include a grain boundary phase 3 including R, T and M elements at least in the ranges of 25-35% for R, 60-70% for T, and 2-10% for M; the figures show relative percentages of the numbers of the R, T and M elements.
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