Enhanced dielectric and microwave absorption properties of Cr/Al2O3 coatings deposited by low‐power plasma spraying |
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| Authors: | Liang Zhou Meng Chen Yanli Dong Zhanwei Yuan |
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| Affiliation: | 1. School of Materials Science and Engineering, Chang'an University, Xi'an, China;2. Centre for Advanced Coating Technologies, University of Toronto, Toronto, Canada;3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, China;4. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China |
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| Abstract: | Low‐power plasma‐sprayed Cr/Al2O3 coatings have been developed for their potential application as broad bandwidth, thin thickness, lightweight, and strong microwave‐absorbing materials. The dielectric and microwave absorption properties of the as‐sprayed coatings were studied in the X‐band (from 8.2 to 12.4 GHz). High complex permittivity of the coatings was obtained because of a large number of internal boundaries and the conductive networks. Meanwhile, a significant enhancement of microwave absorption properties of the coating was achieved due to the enhanced interfacial polarization and conductance loss. The reflection loss (RL) <?10 dB of the Al2O3–15Cr coating was obtained from 9.8 to 11.4 GHz by choosing an appropriate coating thickness, and an optimal minimum reflection loss (RLmin) of ?45.35 dB was achieved at 10.3 GHz with a thin thickness of 1.32 mm. |
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| Keywords: | coatings plasma spraying dielectric materials/properties absorption/absorbents microstructure |
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