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    • 8. 发明公开
    • 영구자석 및 영구자석의 제조방법
    • 永磁体和永磁体的制造方法
    • KR1020090091203A
    • 2009-08-26
    • KR1020097012985
    • 2007-12-19
    • 가부시키가이샤 알박
    • 나가타히로시나카무라큐조카토우타케오나카쯔카아쯔시무카에이치로우이토우마사미요시이즈미류신가키요시노리
    • H01F1/08H01F41/02
    • C22C33/0242B22F2998/00B22F2998/10B22F2999/00C22C2202/02H01F41/0273H01F41/0293C22C33/0278B22F3/12B22F2201/40B22F2201/10B22F2201/20
    • Disclosed is a method for producing a permanent magnet having extremely high coercivity and high magnetic characteristics with high productivity. Specifically, there are performed a first step for adhering at least one of Dy and Tb to at least a part of the surface of an iron-boron-rare earth sintered magnet, and a second step for dispersing at least one of Dy and Tb adhering to the surface of the sintered magnet into the crystal grain boundary phase of the sintered magnet by conducting a heat treatment at a certain temperature. A magnet obtained by mixing a powder of a main phase alloy (which is mainly composed of an R2T14B phase wherein R represents at least one rare earth element mainly composed of Nd, and T represents a transition metal alloy mainly composed of Fe) and a powder of a liquid phase alloy (which has a higher R content than the R2T14B phase and is mainly composed of an R-rich phase) at a certain mixing ratio, press molding the thus-obtained mixed powder in a magnetic field, and then sintering the molded body in a vacuum or in an inert gas atmosphere is used as the sintering magnet. ® KIPO & WIPO 2009
    • 公开了一种制造具有高矫顽磁力和高磁特性并具有高生产率的永久磁铁的方法。 具体而言,进行将Dy和Tb中的至少一种与铁 - 硼 - 稀土类烧结磁体的至少一部分表面粘合的第一工序,以及分散Dy和Tb中的至少一种附着的第二工序 通过在一定温度下进行热处理,将烧结磁体的表面形成为烧结磁体的晶界相。 将主相合金(主要由R2T14B相组成的粉末,其中R表示至少一种主要由Nd组成的稀土元素,T表示主要由Fe组成的过渡金属合金)和粉末 的液相合金(其比R2T14B相具有更高的R含量并且主要由富R相组成)以一定的混合比将该所得混合粉末在磁场中进行压制成型,然后烧结 在真空中或惰性气体气氛中使用成型体作为烧结磁体。 ®KIPO&WIPO 2009