Single source precursor derived SiBCNHf ceramic with enhanced high-temperature microwave absorption and antioxidation

作     者：Yan Song Ziyu Liu Xicheng Zhang Runqiu Zhu Youwei Zhang Pinggui Liu Lihua He Jie Kong Yan Song;Ziyu Liu;Xicheng Zhang;Runqiu Zhu;Youwei Zhang;Pinggui Liu;Lihua He;Jie Kong

作者机构：MOE Key Laboratory of Space Applied Physics and ChemistrySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第126卷第31期

页      面：215-227页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Science Fund for Distinguished Young Scholars(No.52025034) National Science and Technology Major Project of China(No.J2019-VI-0017-0132) 

主　　题：hb-PBSZ-Hf precursor SiBCNHf ceramic EM wave absorption Antioxidation performance 

摘      要：Electromagnetic(EM)wave-absorbing materials with high-temperature-resistance are urgently desirable to eliminate EM interference in extreme *** derived ceramics(PDC)route is being evolved as an effective strategy to solve the ***,a single source hyperbranched polyborosi-lazane precursor containing hafnium(hb-PBSZ-Hf)is introduced and the SiBCNHf ceramic is obtained by further *** micro-sized tissues including HfC,SiC,HfB 2 nanocrystals and segregated carbons are in situ generated during annealing which not only increase EM wave absorption ability(minimum re-flection coefficient(RC_(min))is-56.71 dB with a thickness of 2.5 mm,effective absorption bandwidth(EAB)is 3.4 GHz),but also improve antioxidation property(less than 2 wt.%mass fluctuation at 1400℃in air).Theoretical simulation of complex permittivity suggests that SiBCNHf ceramic has an RC_(min)of less than-5 dB for the whole X-band even at 1100℃.Such SiBCNHf ceramic with superior high-temperature-resistance and antioxidation performance derived from single source precursors possesses great potential for EM wave absorbing coatings in high-temperature and harsh environments.