Excellent electromagnetic wave absorption of MOF/SiBCN nanomaterials at high temperature  

作　　者：Chunjia LUO Peng MIAO Yusheng TANG Jie KONG 

机构地区：[1]MOE Key Laboratory of Material Physics and Chemistry under Extraordinary,Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Chinese Journal of Aeronautics》2021年第11期277-291,共15页中国航空学报（英文版）

基　　金：the grant from the National Natural Science Foundation of China(No.21875190);Innovation Team of Shaanxi Sanqin Scholars and the Natural Science Basic Research Plan for Distinguished Young Scholar in Shaanxi Province of China(No.2018JC-008)。

摘　　要：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(RC_(min))was-51.6dB and effective absorption bandwidth(EAB)is 3.93GHz at room temperature.At an elevated temperature of 600℃,the RC_(min) reached-30.29 dB and EAB covered almost the whole X-band(3.95GHz,8.45–12.4GHz).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.

关 键 词：Electromagnetic wave absorption High temperature resistance Metal-organic framework Polymer-derived ceramics Siliconboron carbonitride 

分 类 号：V25[一般工业技术—材料科学与工程] V218[航空宇航科学与技术—航空宇航制造工程]