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    R-T-B-based rare earth magnet particles, process for producing the R-T-B-based rare earth magnet particles, and bonded magnet
    1.
    发明公开
    R-T-B-based rare earth magnet particles, process for producing the R-T-B-based rare earth magnet particles, and bonded magnet 有权
    基于R-T-B-Seltenerdmagnetteilchen，用于制备所述基于R-T-B粘结磁体和Seltenerdmagnetteilchen

    公开(公告)号：EP2779179A2

    公开(公告)日：2014-09-17

    申请号：EP14159241.0

    申请日：2014-03-12

    申请人： Toda Kogyo Corporation

    发明人： Katayama,, Nobuhiro ,  Kawasaki,, Hirofumi ,  Morimoto,, Koichiro

    IPC分类号： H01F1/057 ,  H01F1/08 ,  H01F41/02

    CPC分类号： H01F1/0573 ,  B22F9/04 ,  B22F2998/10 ,  B22F2999/00 ,  C21D6/00 ,  C21D2201/00 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/0578 ,  B22F2201/013 ,  B22F1/0085 ,  B22F2201/20 ,  B22F2201/11

    摘要： An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670°C and not higher than 820°C for a period of not less than 30 min and not more than 300 min.

    摘要翻译： 本发明的一个目的是增强由宣传片廷形成连续的富R的晶界相的磁性颗粒的矫顽力在颗粒的磁性相的晶粒边界，且由此得到的RTB系稀土类磁铁 具有高剩余磁通密度进一步粒子。 本发明涉及到生产能够表现出高矫顽力的RTB系稀土类磁铁粒子甚至当Al的含量。其中降低，高的剩余磁通密度的，其中形成富R的晶界相的 在其中可通过促进热处理含Al通过HDDR处理在真空中或在Ar气氛中获得的RTB系稀土类磁铁粒子在不低于670℃的温度和不高于820℃的期间的 不小于30分钟，不超过300分钟。