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    • 10. 发明授权
    • Rare-earth magnet and manufacturing method thereof and magnet motor
    • 稀土磁铁及其制造方法和磁铁
    • US07871475B2
    • 2011-01-18
    • US12534530
    • 2009-08-03
    • Matahiro KomuroYuichi Satsu
    • Matahiro KomuroYuichi Satsu
    • H01F1/057
    • H01F1/0572H01F41/0293Y10T428/2991
    • The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered grain boundary phase is formed on a surface or a potion of a grain boundary of Nd2Fe14B which is a main phase of an R—Fe—B (R is a rare-earth element) based magnet, and wherein the grain boundary phase contains a fluoride compound, and wherein a thickness of the fluoride compound is 10 μm or less, or a thickness of the fluoride compound is from 0.1 μm to 10 μm, and wherein the coverage of the fluoride compound over a main phase particle is 50% or more on average. Moreover, after layering fluoride compound powder, which is formed in plate-like shape, in the grain boundary phase, the rare earth magnet is manufactured by quenching the layered compound after melting it at a vacuum atmosphere at a predetermined temperature, or by heating and pressing the main phase and the fluoride compound to make the fluoride compound into a layered fluoride compound along the grain boundary phase.
    • 本发明的目的是提供一种能够在高矫顽力和高残留磁通密度之间实现良好平衡的稀土类磁铁及其制造方法。 本发明提供一种在作为R-Fe-B(R为稀土类元素)的主相的Nd2Fe14B的晶界的表面或部分形成层状晶界相的稀土类磁铁, 并且其中所述晶界相包含氟化物,并且其中所述氟化物的厚度为10μm以下,或所述氟化物的厚度为0.1μm〜10μm,并且其中所述氟化物的覆盖率 主相粒子上的化合物平均为50%以上。 此外,在晶界相中形成板状的氟化物复合粉末之后,通过在预定温度下在真空气氛下或通过加热熔化之后将层状化合物淬火来制造稀土磁铁, 按下主相和氟化物,使氟化合物沿着晶界相成为层状氟化物。