| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth magnet with high coercive force and relatively high magnetization by enabling penetration of modifying alloy that enhances the coercive force (in particular, coercive force at high-temperature atmosphere) at a lower temperature than in a conventional manufacturing method of a rare earth magnet.
SOLUTION : A manufacturing method of a rare earth magnet is provided, the method comprising : a first step of manufacturing a molded body C by performing a hot plastic processing that adds anisotropy to a sintered body S, the sintered body S being formed with a main phase MP of an RE-Fe-B type nano-crystal structure (at least either one of RE : Nd, or Pr) and with a grain boundary phase BP of RE-X alloy (X is a metal element) present at the periphery of the main phase MP; and a second step of manufacturing a rare earth magnet RM by melting an RE-Y-Z alloy (Y is a transition metal element, and Z is a heavy rare earth element) that enhances the coercive force of the molded body C and the grain boundary phase BP together, and by penetrating in liquid-phase the RE-Y-Z alloy molten solution from the surface of the molded body C.
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