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首页> 外文期刊>Physica, B. Condensed Matter >Microwave-absorbing properties of shape-optimized carbonyl iron particles with maximum microwave permeability
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Microwave-absorbing properties of shape-optimized carbonyl iron particles with maximum microwave permeability

机译：具有最大微波透过率的形状优化的羰基铁颗粒的微波吸收特性

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摘要

The microwave-absorbing properties for different shapes of carbonyl-iron particles prepared by the high-energy planetary ball milling with 40vol% in epoxy resin matrix have been investigated. Higher value of magnetic permeability and permittivity can be obtained in the composites for thin flake carbonyl iron than spherical powders. The results are attributed to reduction of eddy current loss, orientation of magnetic moment and space-charge polarization with the shape change from spherical powders to thin flake particles. As the iron flakes with 0.4 mu m in thickness as the absorbent fillers, the minimum RL value of -6.20 dB was observed at 4.57 GHz with thickness of 1 mm. The minimum reflection loss (RL) shifts to lower frequency and the value declines with change from spherical powders to thin flakes. It results from the considerable dielectric loss in the absorbing materials.
机译：研究了通过高能行星式球磨制备的不同形状的羰基铁粉在环氧树脂基体中的吸波性能，其中球粉含量为40vol％。在薄片状羰基铁的复合物中，可以获得比球形粉末更高的导磁率和介电常数。结果归因于涡流损耗的减少，磁矩的定向和空间电荷极化，其形状从球形粉末变为薄片状颗粒。作为厚度为0.4微米的铁鳞片作为吸收性填料，在厚度为1毫米的4.57 GHz处观察到的最小RL值为-6.20 dB。最小反射损耗（RL）移至较低频率，并且值从球形粉末变为薄薄片而下降。这是由于吸收材料中相当大的介电损耗造成的。

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