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Multiscale designed SiC f /Si 3 N 4 composite for low and high frequency cooperative electromagnetic absorption
Author(s) -
Zhou Qian,
Yin Xiaowei,
Ye Fang,
Mo Ran,
Liu Xiaofei,
Fan Xiaomeng,
Cheng Laifei,
Zhang Litong
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15816
Subject(s) - materials science , microstructure , reflection loss , metamaterial , composite number , ceramic , absorption (acoustics) , chemical vapor infiltration , reflection (computer programming) , composite material , electromagnetic radiation , optoelectronics , optics , computer science , physics , programming language
With the aim to design a particular material for low and high frequency cooperative electromagnetic absorption at high temperature, a multiscale design is proposed by combining the microstructure and meta‐structure in one material. The SiC f /Si 3 N 4 composite is prepared via the chemical vapor infiltration technique with SiC f as the EM wave absorbing phase and Si 3 N 4 as the wave‐transparent ceramic matrix. The crossing grooved meta‐structure is designed and fabricated to further improve its absorbing properties and to guarantee its absorbing capacity stability at high temperature. A minimum reflection loss of −15.3 dB and −14.8 dB can be reached at 8 and 18 GH z with a total thickness of 5 mm. The temperature‐dependent reflection loss of the designed meta‐structure keeps relative reliable high temperature absorbing performances from room temperature to 500°C. This effective enhanced EM wave absorbing property is believed to be a consequence of multiscale effect induced by combining the traditional EM absorbing materials with metamaterial structure.