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Ultra-porous and lightweight microwave absorber based on epoxy foam loaded with long carbon fibers

Abstract : A simple methodology to fabricate ultra-porous and lightweight epoxy foam composites loaded with carbon fibers is presented. These materials are proposed for microwave absorbing application. The elaborated composite density can be controlled via proper proportioning of carbon fiber/solvent/surfactant/epoxy components constituting the absorber composites. The influence of the weight percentage of these different components, on the composite structure, is studied. The density of the composites can be reduced to 0.05g‧cm−3 while the density of the neat epoxy foam is about 0.12g‧cm−3. Dielectric characterization of composites elaborated with low weight percentages of carbon fibers (from 0.0125 wt.% to 0.075 wt.%) is conducted using free space method. The simulation of a multilayer absorber is conducted and predicts a promising absorption performance (reflection coefficient andlt;-10 dB) for the wide studied frequency band; this result was confirmed by the measurement of a multilayer absorber prototype. Finally, these performances are compared to commercial absorber materials having same dimensions. © 2020 Elsevier Ltd
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https://hal.archives-ouvertes.fr/hal-03130003
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Wednesday, February 3, 2021 - 11:27:55 AM
Last modification on : Wednesday, April 27, 2022 - 4:19:34 AM

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H. Breiss, A. El Assal, R. Benzerga, A. Sharaiha, A. Jrad, et al.. Ultra-porous and lightweight microwave absorber based on epoxy foam loaded with long carbon fibers. Materials Research Bulletin, Elsevier, 2021, 137, pp.111188. ⟨10.1016/j.materresbull.2020.111188⟩. ⟨hal-03130003⟩

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