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首页> 外文期刊>Magnetics, IEEE Transactions on >Preparation and Microwave Properties of Silica Coated Ni–Fe–Mo Flakes Composites
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Preparation and Microwave Properties of Silica Coated Ni–Fe–Mo Flakes Composites

机译：二氧化硅包覆的Ni-Fe-Mo片状复合材料的制备及微波性能

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摘要

Fabrication of silica coated permalloy-like flaky particles and microwave properties of uncoated and coated particles dispersed in a polymer matrix are presented. The silica layer is successfully obtained through the Stöber process and its thickness is about 50 nm. Permeability and permittivity measurements are carried out using an APC7 coaxial line. It is demonstrated that composites with an insulating layer exhibit the same permeability levels as the ones filled with uncoated permalloy-like flakes but lower permittivity levels which improves its impedance matching and thus enhances its microwave absorbing properties. Calculated reflection loss of 1 mm composite layer shows that peak frequencies are shifted to higher frequencies while their intensities are slightly increased when composites are filled with coated flaky particles (${-}$4.26 dB at 1.89 GHz for the uncoated flakes and ${-}$4.53 dB at 2.57 GHz for the coated ones at the same volume content of 21%). Composites filled with higher volume contents are expected to be promising candidates as absorbing materials above the GHz range.
机译：介绍了二氧化硅涂层的坡莫合金状片状颗粒的制备以及分散在聚合物基质中的未涂层和涂层颗粒的微波性能。二氧化硅层是通过Stöber工艺成功获得的，其厚度约为50 nm。渗透率和介电常数的测量是使用APC7同轴线进行的。已证明具有绝缘层的复合材料表现出与填充未涂覆的坡莫合金状薄片相同的磁导率水平，但介电常数较低，这改善了其阻抗匹配，从而增强了其微波吸收性能。计算出的1毫米复合材料层的反射损耗表明，当复合材料填充有涂层鳞片状颗粒时，峰值频率会移至更高的频率，而强度却会略有增加（<公式>，{ -} $ 未覆盖的薄片和 $ {-} $ 在1.89 GHz时为4.26 dB在相同的体积含量为21％的情况下，镀层光纤在2.57 GHz下为4.53 dB）。填充更高体积含量的复合材料有望成为有希望的候选材料，成为GHz范围以上的吸收材料。

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