Electromagnetic wave absorption enhancement of carbon black/gypsum based composites filled with expanded perlite

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• 作者：Shuai Xie^a ; ^b ; ^{xs5649@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zhijiang Ji^a ; ^{jzj1964@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Yang Yang^a ; ^{y.y.live@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Guoyan Hou^a ; ^{houguoyan@cbmamail.com.cn" class="auth_mail" title="E-mail the corresponding author} ; Jing Wang^a ; ^{wangcbma@263.net" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hybrid ; Electrical properties ; Mechanical properties ; Wave absorption (nominated)
• 刊名：Composites Part B: Engineering
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：106
• 期：Complete
• 页码：10-19
• 全文大小：3983 K

文摘

The electromagnetic (EM) wave absorbing carbon black (CB)/gypsum based composites with high wave absorption properties and wide effective bandwidth were prepared by filling expanded perlite (EP) simply. The influences of CB contents, EP volume concentration, EP particle size, and thickness of samples on EM wave absorption were investigated, and the absorption mechanisms were analyzed as well. The results indicate that the wave absorption of the composites can be remarkably enhanced, due to the improvement of impedance matching as well as the single and multiple scattering and refractions caused by EP particles. The reflectivity is lower than −10 dB in the frequency ranges of 2–3, 5–6.5 and 8–18 GHz for the sample with 3% CB, when the EP volume concentration and sample thickness are 40 vol% and 20 mm, respectively, with the EP diameter of 1 mm. The prepared composites with low cost and high efficiency can be considered as a promising candidate used in construction engineering for EM wave absorption.