TY - JOUR
T1 - Si3N4-BN-SiCN ceramics with unique hetero-interfaces for enhancing microwave absorption properties
AU - Xue, Jimei
AU - Ren, Fangyuan
AU - Dong, Yongpeng
AU - Wei, Hanjun
AU - Yang, Fan
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - SiCN-based ceramics with broadband and strong microwave absorption properties are desired for the structural and functional integration of ceramic matrix composites. The elemental composition and thermal expansion coefficients of the ceramics matrix crucially affect its microstructure and electromagnetic wave (EMW) absorption properties. BN layer with lower electrical conductivity and higher specific area, exhibits both the impedance matching characteristic and EMW attenuation in the process of multiple reflections, electrical conductivity loss, dipole polarization and interfacial polarization. Therefore, Si3N4-BN-SiCN ceramics, which were synthesized using chemical vapor infiltration (CVI) method, construct unique hetero-interface of Si3N4-BN, Si3N4–SiCN and BN-SiCN. Therefore, the Si3N4-BN-SiCN ceramics have outstanding EMW absorption performance and realize an effective absorption bandwidth (EAB) that covers the whole X band and the minimum reflection coefficient (RC) reaches -18.43 dB at a thickness of 3.37 mm.
AB - SiCN-based ceramics with broadband and strong microwave absorption properties are desired for the structural and functional integration of ceramic matrix composites. The elemental composition and thermal expansion coefficients of the ceramics matrix crucially affect its microstructure and electromagnetic wave (EMW) absorption properties. BN layer with lower electrical conductivity and higher specific area, exhibits both the impedance matching characteristic and EMW attenuation in the process of multiple reflections, electrical conductivity loss, dipole polarization and interfacial polarization. Therefore, Si3N4-BN-SiCN ceramics, which were synthesized using chemical vapor infiltration (CVI) method, construct unique hetero-interface of Si3N4-BN, Si3N4–SiCN and BN-SiCN. Therefore, the Si3N4-BN-SiCN ceramics have outstanding EMW absorption performance and realize an effective absorption bandwidth (EAB) that covers the whole X band and the minimum reflection coefficient (RC) reaches -18.43 dB at a thickness of 3.37 mm.
KW - Dielectric properties
KW - Microstructure
KW - Microwave absorption properties
KW - SiN-BN-SiCN ceramics
UR - http://www.scopus.com/inward/record.url?scp=85099626475&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2021.01.075
DO - 10.1016/j.ceramint.2021.01.075
M3 - 文章
AN - SCOPUS:85099626475
SN - 0272-8842
VL - 47
SP - 12261
EP - 12268
JO - Ceramics International
JF - Ceramics International
IS - 9
ER -