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    • 19. 发明授权
    • Nanocomposite bulk magnet and process for producing same
    • 纳米复合体磁体及其制造方法
    • US08961868B2
    • 2015-02-24
    • US13260758
    • 2010-03-30
    • Toshio Miyoshi
    • Toshio Miyoshi
    • B22F3/14B22F1/00H01F1/057B82Y25/00C22C33/02C22C38/00H01F41/02B22F9/04
    • H01F1/0579B22F2009/041B22F2998/10B82Y25/00C22C33/0278C22C38/005H01F1/0576H01F41/0266Y10T428/2982B22F9/08B22F9/04B22F1/0085B22F3/14
    • In a nanocomposite bulk magnet according to the present invention, nanocomposite magnet powder particles, including an Nd2Fe14B crystalline phase and an α-Fe phase, are combined together. The composition of the magnet is represented by T100-x-y-z-n(B1-qCq)xRyTizMn, where T is at least one transition metal element selected from the group consisting of Fe, Co and Ni and always including Fe, R is at least one rare-earth element including substantially no La or Ce, M is an additive metallic element, and x, y, z, n and q satisfy 4 at %≦x≦10 at %, 6 at %≦y≦10 at %, 0.05 at %≦z≦5 at %, 0 at %≦n≦10 at %, and 0≦q≦0.5, respectively. The powder particles have a minor-axis size of less than 40 μm. And powder particles, of which the major-axis size exceeds 53 μm, account for at least 90 mass % of the entire magnet. And those powder particles are directly combined with each other. Consequently, a full-dense magnet, of which the density is 96% or more of the true density of its material alloy, is realized.
    • 在根据本发明的纳米复合体磁体中,将包含Nd 2 Fe 14 B结晶相和α-Fe相的纳米复合磁体粉末颗粒组合在一起。 磁铁的组成由T100-xyzn(B1-qCq)xRyTizMn表示,其中T是选自Fe,Co和Ni中的至少一种过渡金属元素,并且总是包括Fe,R是至少一种稀有金属, 包括基本上不含La或Ce的M元素,M是添加金属元素,x,y,z,n和q满足4at%≦̸ x≦̸ 10at%,6at%≦̸ y≦̸ 10at% at%≦̸ z≦̸ 5 at%,0 at%≦̸ n≦̸ 10 at%,0≦̸ q≦̸ 0.5。 粉末颗粒的小轴尺寸小于40μm。 主轴尺寸超过53μm的粉末颗粒占整个磁体的至少90质量%。 并且这些粉末颗粒彼此直接结合。 因此,实现了密度为其材料合金的真实密度的96%以上的全密度磁体。