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首页> 外文期刊>Journal of industrial and engineering chemistry >Electromagnetic wave shielding effectiveness of Fe_(73.5)Si_(13.5)B9Nb3Cu1 powder/epoxy composites
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Electromagnetic wave shielding effectiveness of Fe_(73.5)Si_(13.5)B9Nb3Cu1 powder/epoxy composites

机译：Fe_（73.5）Si_（13.5）B9Nb3Cu1粉末/环氧树脂复合材料的电磁波屏蔽效能

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摘要

Magnetic powders composed of Fe_(73.5)Si_(13.5)B9Nb3Cu1 were prepared using a ball milling technique, and selected powders were annealed at 823 K in a vacuum. Scanning electron microscopy observations determined the shapes of the powders to be of a flake type. To test the electromagnetic wave absorption properties, Fe_(73.5)Si_(13.5)B9Nb3Cu1 and epoxy composites were fabricated using an electron beam curing technique with powder/epoxy ratios of 20/80, 30/70, 40/60, and 50/50 by weight. The complex permeability and permittivity of the composites were measured using a network analyzer (0.5-8 GHz), and were used to calculate the refection losses as a function of the composite thickness and frequency. The band width of a reflection loss below -20 dB was 700 MHz from 4.23 GHz to 4.93 GHz at 3.8 mm thickness, attributed to the composite containing 50 wt% of powder. For the composite containing 50 wt% of annealed powder, the minimum reflection loss was observed near 8 GHz at 2.8 mm thickness.
机译：使用球磨技术制备由Fe_（73.5）Si_（13.5）B9Nb3Cu1组成的磁性粉末，并将选定的粉末在823 K的真空中退火。扫描电子显微镜观察确定粉末的形状为片状。为了测试电磁波吸收性能，使用电子束固化技术以粉末/环氧比为20 / 80、30 / 70、40 / 60和50/50的方式制备了Fe_（73.5）Si_（13.5）B9Nb3Cu1和环氧复合材料按重量。使用网络分析仪（0.5-8 GHz）测量复合材料的复数渗透率和介电常数，并将其用于计算复染损失随复合材料厚度和频率的变化。低于-20 dB的反射损耗的带宽在3.8 mm厚度下从4.23 GHz至4.93 GHz为700 MHz，这归因于复合材料含有50 wt％的粉末。对于包含50wt％的退火粉末的复合物，在2.8mm厚的8GHz附近观察到最小的反射损失。

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