Abstract
The Al@MnO2 composites were synthesized by flake aluminum powder and potassium permanganate via a facile one-step method. As a multi-band stealth material, the composites have both enhanced microwave absorbing property and low infrared emissivity. We can use XRD, XPS, SEM, and TEM to detect structure and performance, respectively. The microwave absorbing properties and infrared emissivity were investigated by vector network analyzer and dual-band infrared emissometer. It was found that the MnO2 nanoparticles were anchored on the aluminum sheets densely, and the concentration of MnO2 nanoparticles had a certain effect on absorption performance and infrared emissivity. As an absorber, with its polarization effect, resonance effect, and good impedance matching, the composite with the filler loading is 60 wt% can perform excellent microwave absorption performance (Chen et al. in Optik (Stuttg) 172:840–846, 2018). The minimum reflection loss reached − 42.93 dB at 12.72 GHz with a thickness of 1.0 mm, and the bandwidth that exceed − 10 dB ranged from 12.08 GHz to 13.36 GHz (Li et al. in J Colloid Interface Sci 507:131–138, 2017). As an infrared stealth material, the composite exhibits low infrared emissivity in the band range of 8–14 µm, which was attributed to the existence constituent of flake aluminum powder. The infrared emissivity reached 0.55 at the lowest, as well as enlarged with the increase of MnO2 concentration. Therefore, the Al@MnO2 composites could be a potential superior microwave and infrared compatible stealth material.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51477002 and 51707003), and the University Synergy Innovation Program of Anhui Province (GXXT-2019-028).
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Liu, H., Xing, H., Shi, R. et al. Facial synthesis of Al@MnO2 with enhanced microwave absorption and low infrared emissivity. J Mater Sci: Mater Electron 31, 18791–18802 (2020). https://doi.org/10.1007/s10854-020-04419-y
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DOI: https://doi.org/10.1007/s10854-020-04419-y