期刊
CHINESE JOURNAL OF AERONAUTICS
卷 34, 期 11, 页码 277-291出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cja.2020.06.028
关键词
Electromagnetic wave absorption; High temperature resistance; Metal-organic framework; Polymer-derived ceramics; Siliconboron carbonitride
资金
- National Natural Science Foundation of China [21875190]
- Innovation Team of Shaanxi Sanqin Scholars
- Natural Science Basic Research Plan for Distinguished Young Scholar in Shaanxi Province of China [2018JC-008]
This study focuses on a nanocomposite material with potential for use as a microwave absorbing material at high temperatures, showing excellent absorption performance and significant implications for the design of stealth aircrafts and aero-engines.
Electromagnetic wave absorbing materials at high-temperature are urgently needed for stealth aircrafts or aero-engines worked in harsh environments. In this contribution, cobaltcontaining siliconboron carbonitride (MOF/SiBCN) nanomaterials were prepared by pyrolyzing metal-organic framework, i.e. cobalt 2-methylimidazole (ZIF-67), and hyperbranched polyborosilazane. The rhombic dodecahedral ZIF-67 and cobalt element promoted in situ formation of dielectric loss phases, including SiC nanocrystals, CoSi nanocrystals and turbostratic carbons. The ZIF-67/SiBCN nanomaterials showed excellent microwave absorption both at room and elevated temperature. The minimum reflection coefficient (RCmin) was -51.6 dB and effective absorption bandwidth (EAB) is 3.93 GHz at room temperature. At an elevated temperature of 600 degrees C, the RCmin reached -30.29 dB and EAB covered almost the whole X-band (3.95 GHz, 8.45-12.4 GHz). The ZIF-67/SiBCN nanocomposites are promising and useful platform for microwave absorbing materials at high-temperature. It may shed light on the downstream applications in designing next generation areo-engines and stealth aircrafts. (c) 2020 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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