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http://dx.doi.org/10.12989/cme.2021.3.2.157

Sandwich structured lightweight carbon black/cement composites for X-band electromagnetic wave absorption and thermal insulation  

Xie, Shuai (China Building Materials Academy)
Ji, Zhijiang (China Building Materials Academy)
Zhang, Jinjun (China Building Materials Academy)
Cao, Yanxin (China Building Materials Academy)
Wang, Jing (China Building Materials Academy)
Publication Information
Composite Materials and Engineering / v.3, no.2, 2021 , pp. 157-166 More about this Journal
Abstract
In order to develop a lightweight cement based composite with dual-function of EM wave absorption and thermal insulation, sandwich structure was designed to achieve excellent EM absorption capacity, and expanded perlite and carbon black were used as lightweight aggregates and EM absorbent, respectively. The EM absorption properties were studied by arching reflected method, and the results indicate that the sandwich structure design can obviously enhance the EM absorption capacity of cement composites. The sandwich structured composites exhibit better EM absorption properties than the traditional gradient multi-layer structured composites. The reflection loss of three-layer and four-layer sandwich structured composites can be less than -10 dB and -15 dB in the whole X-band. The thermal conductivity test results shows that the developed cement composites possess thermal insulation function.
Keywords
composite materials; layered structure; microwave absorption; sandwich structures; thermal conductivity;
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