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    • 42. 发明授权
    • Fe-Ni alloy fine powder of flat shape
    • Fe-Ni合金细粉扁平形状
    • US5352268A
    • 1994-10-04
    • US19657
    • 1993-02-19
    • Takashi MeguroHideki NakamuraYoichi MochidaTsutomu Inui
    • Takashi MeguroHideki NakamuraYoichi MochidaTsutomu Inui
    • H01F1/147H05K9/00H01F1/047
    • H01F1/14733
    • A flat-shaped fine Fe-Ni alloy powder suitable for use as a magnetic shield coating material for cards or the like. The powder has a mean particle size of 0.1 to 30 .mu.m, a mean thickness not greater than 2 .mu.m and a coercive force not greater than 400 A/m. The flat-shaped fine powder is produced by preparing an Fe-Ni alloy powder of a composition which exhibits, in a bulk state, a saturated magnetostriction constant value falling within the range of .+-.15.times.10.sup.-6 and which contains, by weight, 70 to 83% Ni, 2 to 6% Mo, 3 to 6% Cu, 1 to 2% Mn, not more than 0.05% C and the balance Fe and incidental impurities, pulverizing the alloy powder by an attrition mill, and annealing the pulverized powder in a fluidized or moving state in a substantially non-oxidizing atmosphere.
    • 适合用作卡片等的磁屏蔽涂层材料的扁平状Fe-Ni合金粉末。 粉末的平均粒径为0.1〜30μm,平均粒径不大于2μm,矫顽力不大于400A / m。 扁平状细粉末是通过制备组合物的Fe-Ni合金粉末制造的,该组合物在大体积状态下呈现在+/- 15×10 -6范围内的饱和磁致伸缩常数值, 70〜83%的Ni,2〜6%的Mo,3〜6%的Cu,1〜2%的Mn,不大于0.05%的C,余量为Fe和杂质,用磨粉机粉碎合金粉末, 在基本上非氧化性气氛中处于流化或移动状态的粉碎粉末。