TY - JOUR
T1 - Effects of SiC fibers on microwave absorption and electromagnetic interference shielding properties of SiCf/SiCN composites
AU - Li, Quan
AU - Yin, Xiaowei
AU - Zhang, Litong
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2016 Elsevier Ltd and Techna Group S.r.l.
PY - 2016/12/1
Y1 - 2016/12/1
N2 - SiC fibers have key effects on designing and optimizing electromagnetic wave absorption (EMA) and electromagnetic interference shielding (EMI) properties of SiC fiber reinforced ceramic matrix composites. In this paper, ZMI-SiC fibers and Amosic-SiC fibers were used to fabricate SiCf/SiCN composites with good EMA or EMI properties. Both ZMI-SiC and Amosic-SiC fibers are composed of interpenetrating superfine SiC nano-crystals, graphene-like free carbons and amorphous SiOC phase. Amosic-SiC fibers exhibit better crystallizations and higher free carbon contents than ZMI-SiC fibers. Therefore, Amosic-SiCf/SiCN composite possesses higher electrical conductivity, dielectric and EMI properties than ZMI-SiCf/SiCN composite. The total shielding effectiveness of Amosic-SiCf/SiCN composite reaches 25 dB in the whole X band. ZMI-SiCf/SiCN composite possesses relatively low dielectric constant and high loss tangent, rendering composite good EMA properties. The reflectivity of ZMI-SiCf/SiCN composite is smaller than −7 dB in the whole X band. The mechanisms of dielectric loss, EMI and EMA for composites are discussed.
AB - SiC fibers have key effects on designing and optimizing electromagnetic wave absorption (EMA) and electromagnetic interference shielding (EMI) properties of SiC fiber reinforced ceramic matrix composites. In this paper, ZMI-SiC fibers and Amosic-SiC fibers were used to fabricate SiCf/SiCN composites with good EMA or EMI properties. Both ZMI-SiC and Amosic-SiC fibers are composed of interpenetrating superfine SiC nano-crystals, graphene-like free carbons and amorphous SiOC phase. Amosic-SiC fibers exhibit better crystallizations and higher free carbon contents than ZMI-SiC fibers. Therefore, Amosic-SiCf/SiCN composite possesses higher electrical conductivity, dielectric and EMI properties than ZMI-SiCf/SiCN composite. The total shielding effectiveness of Amosic-SiCf/SiCN composite reaches 25 dB in the whole X band. ZMI-SiCf/SiCN composite possesses relatively low dielectric constant and high loss tangent, rendering composite good EMA properties. The reflectivity of ZMI-SiCf/SiCN composite is smaller than −7 dB in the whole X band. The mechanisms of dielectric loss, EMI and EMA for composites are discussed.
KW - Electromagnetic property
KW - Graphene-like free carbons
KW - SiC nano-crystals
KW - SiC/SiCN composites
UR - http://www.scopus.com/inward/record.url?scp=84994520897&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2016.09.089
DO - 10.1016/j.ceramint.2016.09.089
M3 - 文章
AN - SCOPUS:84994520897
SN - 0272-8842
VL - 42
SP - 19237
EP - 19244
JO - Ceramics International
JF - Ceramics International
IS - 16
ER -