Preparation and microwave absorption properties of lightweight FCI/SCI/PU composite foam
WEI Mengting1, LI Zhuan1, LUO Heng2, LI Jing1,3
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Electronic Information, Central South University, Changsha 410004, China; 3. Foshan Eahison Communication Co., Ltd, Foshan 528100, China
Abstract：Foaming is an effective method for achieving lightweight electromagnetic wave absorption materials, and electromagnetic waves undergo multiple scattering within the foam pores, which helps improve absorption efficiency. This study leveraged the synergistic effect of multi-shaped magnetic powders and pore structures, employing mechanical blending and a one-step foaming method to composite-add flake carbonyl iron (FCI) and spherical carbonyl iron (SCI) into a polyurethane (PU) matrix, to prepare lightweight porous polyurethane composite foam (FCI/SCI/PU). The influence and mechanism of different FCI and SCI mass ratios on the X-band absorptive performance of FCI/SCI/PU foam were investigated. The results indicate that when the mass ratio of FCI to SCI is 2∶1, the FCI/SCI/PU foam exhibits optimal absorption properties, reaching an absorption peak at 12.4 GHz with a value of -29.17 dB, an effective absorption bandwidth of 2.12 GHz, and a foam density of 0.30 g/cm3. The improvement in electromagnetic wave absorption properties stems from multiple loss mechanisms such as eddy current loss, natural resonance, and interface polarization, as well as the foam's excellent impedance matching performance and multiple scattering effects due to its pore structure.
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2025, Vol. 30 
