Flake-shaped FeSi-based metallic amorphous alloy particles, having an aspect ratio as high as 175:1, were prepared by ball-milling gas-atomized amorphous powders of an effective diameter of 20 µm. The starting powder has a saturation magnetic flux density Bs of 1.5 T and a coercivity Hc of 94 A/m. The aspect ratio of the flakes, as well as their magnetic properties, were controlled by milling process parameters, such as duration, speed, and the type, mass, and diameter of the milling balls. To minimize the oxidation of the charge, the powders were handled in an argon gas-purged glove box, milled in toluene, and subsequently dried in vacuo. Subsequently, soft magnetodielectric composites were prepared by suspending and aligning the FeSi-based powders in paraffin wax or epoxy resin. The composites were then pressed into toroids for measurements of their high-frequency complex permeability by a vector network analyzer. The influence of the flakes’ aspect ratio and volume loading fraction on the permeability of the composites were investigated. Results indicate that the composite permeability increases with the flakes’ aspect ratio. For example, for a given loading factor of 30 vol.%, the composite permeability at 0.1 GHz nearly tripled and approached the value of 10 by increasing the aspect ratio of the FeSi-based inclusions from 1 (spheres) to greater than 175:1 (flakes).

中文翻译：

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高性能金属非晶磁片基磁介电电感器

通过球磨有效直径为20μm的气体雾化非晶粉末制备了具有高达175:1的纵横比的片状FeSi基金属非晶合金颗粒。起始粉末具有1.5T的饱和磁通密度Bs和94A/m的矫顽力Hc。薄片的纵横比及其磁性由研磨工艺参数控制，例如持续时间、速度以及研磨球的类型、质量和直径。为了最大限度地减少装料的氧化，粉末在氩气净化的手套箱中处理，在甲苯中研磨，随后在真空中干燥。随后，通过将 FeSi 基粉末悬浮和排列在石蜡或环氧树脂中来制备软磁介电复合材料。然后将复合材料压成环形，通过矢量网络分析仪测量其高频复磁导率。研究了薄片的纵横比和体积载荷分数对复合材料渗透率的影响。结果表明复合材料的渗透率随着薄片的纵横比而增加。例如，对于 30 vol.% 的给定负载因子，通过将 FeSi 基夹杂物的纵横比从 1（球体）增加到大于 175:1，0.1 GHz 下的复合材料磁导率几乎增加了两倍并接近 10 （薄片）。结果表明复合材料的渗透率随着薄片的纵横比而增加。例如，对于 30 vol.% 的给定负载因子，通过将 FeSi 基夹杂物的纵横比从 1（球体）增加到大于 175:1，0.1 GHz 下的复合材料磁导率几乎增加了两倍并接近 10 （薄片）。结果表明复合材料的渗透率随着薄片的纵横比而增加。例如，对于 30 vol.% 的给定负载因子，通过将 FeSi 基夹杂物的纵横比从 1（球体）增加到大于 175:1，0.1 GHz 下的复合材料磁导率几乎增加了两倍并接近 10 （薄片）。