High temperature metamaterial enhanced electromagnetic absorbing coating prepared with alumina ceramic

JOURNAL OF ALLOYS AND COMPOUNDS

卷:874

Article

Zhao, Shixin¹  Ma, Hua¹  Shao, Tengqiang¹  Wang, Jun¹  Yang, Zhaoning²  Meng, Yueyu¹  Feng, Mingde¹  Yan, Mingbao¹  Wang, Jiafu¹  Qu, Shaobo¹ 

[1] Air Force Engn Univ, Dept Basic Sci, Xian 710051, Peoples R China

[2] Xian Univ Posts & Telecommun, Sch Sci, Xian 710121, Peoples R China

关键词: EM absorbing coatings;    High temperature;    Metamaterial;    Alumina ceramic;   

DOI  :  10.1016/j.jallcom.2021.159822

来源: Elsevier

【 摘 要 】

At present, a series of challenges are impeding large-scale application of high temperature radar absorbing coatings (RACs), such as complex preparation of raw material and complicated technology of processing. In this paper, we designed and experimentally demonstrated a high-temperature metamaterial RAC (MRAC) with strong absorption and thin thickness, which is composite of radar absorbing coating and a layer of metamaterial. To avoid complex preparation of raw materials, pure alumina was selected as the radar absorbing coating. Plasma spraying and screen printing were employed to simplify the sample preparation to produce the absorbing coating and the metamaterial layer, ensuring its feasibility and practicality. The metamaterial layer was prepared with a high temperature conductive paste and it improved the impedance matching of the coating and regulated the electromagnetic (EM) resonance, which allows more EM waves to be absorbed. Therefore, excellent high temperature absorption was also achieved with relatively small thickness. At 800 degrees C, the MRAC reflection loss (RL) below -5 dB almost covered the frequency of 10-18 GHz with a thickness of only 1.5 mm. This new metamaterial has broad application prospects by the virtue of its simplicity and convenience in manufacture. (c) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

Free