| 简介 |
Provided is a method for manufacturing a rare-earth magnet enabling effective penetrant-diffusion of a melt of modifier alloy powder without generating oxidation reaction or hydroxylation reaction when the modifier alloy powder is used for a better coercive force as well. The method for manufacturing a rare-earth magnet includes : a step of producing a compact S by hot press processing using magnetic powder B including a RE-T-B main phase MP (RE : at least one type of Nd, Pr, and Y) and a grain boundary phase BP around the main phase MP, and performing hot deformation processing to the compact S to produce a rare-earth magnet precursor C; and a step of bringing modifier alloy powder M including a RE-M alloy (M : a metallic element that does not include heavy rare-earth elements) and having an average grain size of 30 μm or more into contact with a surface of the rare-earth magnet precursor C, followed by heating, so that a melt of the modifier alloy powder M is penetrant-diffused into the rare-earth magnet precursor C, to produce the rare-earth magnet RM. |
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