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    • 8. 发明申请
    • METHOD FOR MANUFACTURING RARE-EARTH MAGNET
    • 制造稀土磁铁的方法
    • US20130195710A1
    • 2013-08-01
    • US13750576
    • 2013-01-25
    • Kazuaki HAGANoritaka MIYAMOTOTetsuya SHOJINoritsugu SAKUMAShinya OMURAMotoki HIRAOKA
    • Kazuaki HAGANoritaka MIYAMOTOTetsuya SHOJINoritsugu SAKUMAShinya OMURAMotoki HIRAOKA
    • H01F41/00
    • H01F41/005B22F3/14B22F3/26B22F2009/048C22C28/00C22C30/00C22C38/00H01F41/0293
    • Provided is a manufacturing method of a rare-earth magnet capable of penetrant-diffusing a modifier alloy to increase a coercive force (especially a coercive force under a high-temperature atmosphere) at a temperature lower than the conventional method for manufacturing a rare-earth magnet without using heavy rare-earth metals such as Dy and Tb, and accordingly capable of manufacturing a high coercivity rare-earth magnet at the lowest cost possible. A method for manufacturing a rare-earth magnet includes the steps of: first step of pressing-forming powder as a rare-earth magnet material to form a compact S, the powder including a RE-Fe—B main phase MP (RE: at least one type of Nd and Pr) and a RE-X alloy (X: metal element) grain boundary phase surrounding the main phase; and second step of bringing a modifier alloy M into contact with the compact S or a rare-earth magnet precursor C obtained by hot deformation processing of the compact S, followed by heat treatment to penetrant-diffuse melt of the modifier alloy M into the compact S or the rare-earth magnet precursor C to manufacture the rare-earth magnet RM, the modifier alloy including a RE-Y (Y: metal element and not including a heavy rare-earth element) alloy having a eutectic or a RE-rich hyper eutectic composition.
    • 本发明提供一种稀土类磁铁的制造方法,该稀土类磁体能够在比传统稀土制造方法低的温度下,使改性剂合金渗透扩散以提高矫顽力(特别是高温环境下的矫顽力) 磁体,而不使用重稀土金属如Dy和Tb,因此能够以最低成本制造高矫顽力稀土类磁体。 一种稀土类磁铁的制造方法,其特征在于,包括以下步骤:作为稀土类磁铁材料的压制成形粉末的第一工序,形成小型S,所述粉末含有RE-Fe-B主相MP(RE:at 至少一种Nd和Pr)和围绕主相的RE-X合金(X:金属元素)晶界; 将改性合金M与压制体S的热变形加工得到的压粉体S或稀土类磁体前体C接触,然后对改性合金M的渗透扩散熔体进行热处理, S或稀土磁体前体C制造稀土磁体RM,改性合金包括具有共晶或富RE的Y-Y(Y:金属元素,不包括重稀土元素)合金 超共晶组成。