材料科学
反射损耗
介电常数
羰基铁
微波食品加热
复合材料
环氧树脂
体积分数
复合数
反射系数
磁导率
吸收(声学)
粒子(生态学)
粒径
电介质
光学
光电子学
物理
膜
地质学
物理化学
海洋学
生物
化学
量子力学
遗传学
作者
Baoshan Zhang,Yong Feng,Jie Xiong,Yi Yang,Huaixian Lu
标识
DOI:10.1109/tmag.2006.874188
摘要
We have investigated the microwave-absorbing properties for different shapes and aggregated states of carbonyl-iron particles dispersed in epoxy resin matrix at various volume concentrations. Here, we discuss the requirements of lower reflection coefficient for the microwave permittivity /spl epsiv//sub r/=/spl epsiv/'-j/spl epsiv/'' and permeability /spl mu//sub r/=/spl mu/'-j/spl mu/''. Compared to the aggregated sphere-shaped particles (SS), the de-aggregated flake-shaped carbonyl iron particles (FS) have higher permeability, lower permittivity, better filling characteristics in epoxy resin, and better absorbing properties in the frequency range of 2-18 GHz. For the FS composite with volume fraction of 0.60 at single-layer thickness of 1 mm, the calculated reflection loss at 2 GHz reaches -4.04 dB and the minimum reflection loss is -12.2 dB at 4.4 GHz, which indicates that the FS composite can be applied as a thinner microwave absorber in the S-band than if SS particles are used. The results also show that different volume concentrations can have high absorption at different wave bands, a fact on which the design of absorbing material can be based.
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