| 简介 |
PROBLEM TO BE SOLVED : To provide a method for manufacturing a rare earth magnet through a hot plastic working, and a rare earth magnet manufactured by this method, especially to provide a rare earth magnet which achieves good processability in hot plastic working by controlling, within an optimum range, the content of Pr making a component of an alloy, and which enables good coercive force performance and good magnetization performance under a high-temperature atmosphere, and a manufacturing method of such a rare earth magnet.
SOLUTION : A method for manufacturing a rare earth magnet comprises : a first step for manufacturing a compact S by compacting magnetic powder B used as a rare earth magnet material, including a RE-Fe-B based main phase MP(RE represents Nd and Pr) and a grain boundary phase BP of RE-X alloy (X represents a metal element) around the main phase MP, and having an average grain diameter in a range of 10-200 nm in the main phase MP; and a second step for manufacturing a rare earth magnet C which is a nanocrystalline magnet by performing a hot plastic work on the compact S to impart anisotropy thereto. In the method, the magnetic powder B includes 25-35 at% of Nd, 0.5-1.5 at% of B, 2-7 at% of Co, 0.2-5 at% of Pr, and Fe.
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