期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 13, 页码 6393-6405出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.06.007
关键词
EM absorption; Additive manufacturing; Preceramic polymers
资金
- National Natural Science Foundation of China [51572154]
- Natural Science Foundation of Shandong Province [ZR2019BEM013]
- China Postdoctoral Science Foundation [2019M652441]
- China Scholarship Council
SiOC ceramics synthesized by the polymer-derived method exhibit excellent EMW absorption properties, with the presence of free carbon and beta-SiC nanocrystallites significantly enhancing their absorption characteristics. 3D printing technology can be used to create structures with optimal absorption performance, aiding in the improvement and optimization of absorbing material selection in practical applications.
The electromagnetic waves (EMW) absorption properties of SiOC ceramics synthesized by polymer-derived method were investigated, and additive manufacturing was employed to obtain the integration of structure and functions. The presence of free carbon and beta-SiC nanocrystallites increased the internal relaxation interfacial polarization, which improved the EMW absorption properties significantly. In particular for the sample pyrolyzed at 1200 degrees C, the effective absorption bandwidth (EAB, RL<-10 dB) and minimum reflection loss (RL)were 4.9 GHz (at a thickness of 1.58 mm) and -23.5 dB, respectively, indicating the excellent EMW absorption properties of this SiOC material. In addition, we 3D printed two typical porous structures (a log-pile grid and a gyroid) in which the thickness of solid element corresponded to the one providing optimal absorption. Additive Manufacturing of designed structures will enable to improve and further optimize the selection and control of the absorbing material in practical applications.
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