Abstract: In this paper, wood-based porous carbon/ferrite composite microwave absorbing materials (WPC/Fe3O4) with excellent properties were prepared by low-temperature pretreatment, vacuum impregnation and high-temperature in-situ growth using masson pine as raw materials. The phase, composition, morphology, and electromagnetic properties were investigated by XRD, XPS, SEM, and VNA. And the mechanism of its absorption was preliminarily explained. The results showed that the WPC/Fe3O4 has excellent absorption performance, with the peak reflection loss reaching -35.6 dB, the effective absorption band width exceeding 5.6 GHz, and the effective absorption of all Ku band electromagnetic waves within the thickness range of 3—4.3 mm. WPC/Fe3O4 has a regular straight pore structure and a rich heterogeneous interface. Fe3O4 nanoparticles grow uniformly in the pores and carbon walls of wood-based porous carbon at high temperatures. As the carbonization temperature increases, the dielectric constant of WPC/Fe3O4 increases significantly, but small change in permeability. The electromagnetic loss mechanisms of WPC/Fe3O4 are mainly conductive loss, magnetic loss and interfacial polarization loss. The composite materials show high efficiency of Ku band electromagnetic wave, which is expected to achieve its application in the microwave field such as electronic communication or target stealth.
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