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    • 8. 发明申请
    • PROCESS FOR PRODUCING RARE-EARTH MAGNET
    • 生产稀土磁铁的方法
    • US20150287528A1
    • 2015-10-08
    • US14441695
    • 2013-11-13
    • Kazuaki HagaNoritaka MiyamotoTetsuya ShojiDaisuke Sakuma
    • Kazuaki HagaNoritaka MiyamotoTetsuya ShojiDaisuke Sakuma
    • H01F41/00
    • H01F41/00C22C1/00C22C38/00C22C2202/00H01F1/0576H01F41/0293
    • 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.
    • 本发明提供一种稀土类磁铁的制造方法,其能够在改性合金粉末用于更好的矫顽力的同时,在不产生氧化反应或羟基化反应的情况下,能够对改性剂合金粉末的熔融物进行有效的渗透扩散。 稀土类磁铁的制造方法包括:使用包含RE-TB主相MP(RE:至少一种Nd,Pr,Y)的磁性粉末B通过热压加工制造压块S的工序;以及 围绕主相MP的晶界相BP,并对压块S进行热变形处理以制备稀土磁体前体C; 将包含RE-M合金(M:不含重稀土类元素的金属元素)和平均粒径为30μm以上的改性剂合金粉末M与稀有金属的表面接触的工序 然后加热,使得改性剂合金粉末M的熔体渗透扩散到稀土磁体前体C中,以制备稀土磁体RM。