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    • 6. 发明授权
    • Magnet powder and method for producing the same, and bonded magnet using the same
    • 磁粉及其制造方法以及使用其的粘结磁铁
    • US06468440B1
    • 2002-10-22
    • US09646793
    • 2000-09-22
    • Shinya SakuradaTomohisa AraiMasami OkamuraKeisuke HashimotoTakahiro Hirai
    • Shinya SakuradaTomohisa AraiMasami OkamuraKeisuke HashimotoTakahiro Hirai
    • C04B3504
    • H01F1/059
    • Magnet powder has a composition expressed by (R1XR2YBZT100−X−Y−Z)100−QNQ (in formula, R1 is at least one kind of element selected from rare earth elements, R2 is at least one kind of element selected from Zr, Hf and Sc, T is at least one kind of element selected from Fe and Co, and X, Y, Z and Q are numbers satisfying 2 atomic %≦X, 0.01 atomic %≦Y, 4≦X+Y≧20 atomic %, 0≦Z≦10 atomic %, and 0.1≦Q≦20 atomic %, respectively), and TbCu7 crystal phase as a principal phase. In such magnet powder, a ratio of fine particles of which maximum diameter is 22 &mgr;m or less is 20% by weight or less. Alternatively, surface roughness of particles constituting the magnet powder is 5 &mgr;m or less in terms of maximum height Ry provided in JIS B 0601-1994. Accordingly, to such a magnet powder, excellent magnetic properties can be obtained with reproducibility.
    • 磁铁粉末具有由(R1XR2YBZT100-XYZ)100-QNQ表示的组成(式中,R1为选自稀土元素中的至少一种元素,R2为选自Zr,Hf,Sc,T中的至少一种元素 是选自Fe和Co中的至少一种元素,X,Y,Z和Q是满足2原子%<= X,0.01原子%<= Y,4 <= X + Y> = 20原子%的数, 0 <= Z <= 10原子%,分别为0.1 <= Q <= 20原子%),TbCu7晶相为主相。 在这种磁铁粉末中,最大直径为22μm以下的微粒的比例为20重量%以下。 或者,构成磁体粉末的颗粒的表面粗糙度以JIS B 0601-1994中规定的最大高度Ry计为5um以下。 因此,对于这种磁铁粉末,可以以重现性获得优异的磁特性。