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    • 18. 发明公开
    • RARE EARTH ELEMENT-IRON BASE PERMANENT MAGNET AND PROCESS FOR ITS PRODUCTION
    • SELTENE-ERDEN-EISEN-TYP-DAUERMAGNET UND SEIN HERSTELLUNGSVERFAHREN。
    • EP0302947A1
    • 1989-02-15
    • EP88902228.1
    • 1988-03-01
    • Seiko Epson Corporation
    • AKIOKA, KojiKOBAYASHI, OsamuSHIMODA, Tatsuya
    • H01F1/04C22C38/16C21D6/00
    • C21D8/1216B22F9/023B22F9/16B22F2998/00C21D6/00C22C1/0441C22C38/005C22C38/10C22C38/16H01F1/0576H01F41/0293
    • A rare earth element-iron base permanent magnet and a process for its production are disclosed. The permanent magnet is produced by hot working of cast ingot prepared by melting and casting an alloy comprising at least one of rare earth metals represented by R, and Fe, B, and Cu at 500°C or above and has fine and magnetically anisotripic crystal particles. The process for its production comprises hot working of cast ingot obtained by melting and casting said alloy at 500°C or above. This process affords a permanent magnet having magnetic properties equivalent or superior to those of a permanent magnet produced by sintering which has been believed to have the best magnetic properties in a simplified manner, thus providing a permanent magnet with high performances inexpensively, In addition, heat treatment of the cast ingot obtained by melting and casting the alloy at 250°C or above, yields an isotropic rare earth earth element-iron base permanent magnet.
    • 这种改进的稀土元素 - 铁基永磁体的制备如下:1)铸锭是制备的。 通过熔融和铸造包含至少一种由R表示的稀土金属和Fe,B和Cu的合金(A)。 2)通过在500度下对铸锭进行热加工获得精细和磁各向异性的晶体颗粒。 C以上。 如果这种热加工在250度之前或之后进行热处理。 C以上时,磁力的持续性将增加。 合金(A)包含R(8-30%),B(2-28%),Cu(6%或更少),Fe和不可避免的杂质。 合金中含有不可避免的杂质S(2原子%以下),C(4原子%以下)和P(4原子%以下)。 Fe成分可以被Co 50原子%以下。 可以在6原子的范围内向合金中添加选自Ga,Al,Si,Bi,V,Nb,Ta,Cr,Mo,W,Ni,Mn,Ti,Zr和Hf中的一种或多种元素 % 或更少。 R可以由选自Pr,Nd,Pr-Nd合金,Ce-Pr-Nd合金,稀土元素中的一种或多种组分组成。 用于制造磁体的改进方法是在热加工之后,将合金研磨并粉碎,并将所得粉末与有机粘合剂捏合并模制以制备磁体。 。