TY - JOUR
T1 - Electromagnetic wave absorption and mechanical properties of silicon carbide fibers reinforced silicon nitride matrix composites
AU - Mo, Ran
AU - Yin, Xiaowei
AU - Ye, Fang
AU - Liu, Xiaofei
AU - Ma, Xiaokang
AU - Li, Quan
AU - Zhang, Litong
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/4
Y1 - 2019/4
N2 - It is difficult for ceramic matrix composites to combine good electromagnetic wave (EMW) absorption properties (reflection coefficient, RC less than -7 dB in X band) and good mechanical properties (flexural strength more than 300 MPa and fracture toughness more than 10 M P·m1/2). To solve this problem, two kinds of wave-absorbing SiC fibers reinforced Si3N4 matrix composites (SiCf/Si3N4) were designed and fabricated via chemical vapor infiltration technique. Effects of conductivity on EM wave absorbing properties and fiber/matrix bonding strength on mechanical properties were studied. The SiCf/Si3N4 composite, having a relatively low conductivity (its conduction loss is about 33% of the total dielectric loss) has good EMW absorption properties, i.e. a relative complex permittivity of about 9.2-j6.4 at 10 GHz and an RC lower than −7.2 dB in the whole X band. Its low relative complex permittivity matches impedances between composites and air better, and its strong polarization relaxation loss ability help it to absorb more EM wave energy. Moreover, with a suitably strong fiber/matrix bonding strength, the composite can transfer load more effectively from matrix to fibers, resulting in a higher flexural strength (380 MPa) and fracture toughness (12.9 MPa▪m1/2).
AB - It is difficult for ceramic matrix composites to combine good electromagnetic wave (EMW) absorption properties (reflection coefficient, RC less than -7 dB in X band) and good mechanical properties (flexural strength more than 300 MPa and fracture toughness more than 10 M P·m1/2). To solve this problem, two kinds of wave-absorbing SiC fibers reinforced Si3N4 matrix composites (SiCf/Si3N4) were designed and fabricated via chemical vapor infiltration technique. Effects of conductivity on EM wave absorbing properties and fiber/matrix bonding strength on mechanical properties were studied. The SiCf/Si3N4 composite, having a relatively low conductivity (its conduction loss is about 33% of the total dielectric loss) has good EMW absorption properties, i.e. a relative complex permittivity of about 9.2-j6.4 at 10 GHz and an RC lower than −7.2 dB in the whole X band. Its low relative complex permittivity matches impedances between composites and air better, and its strong polarization relaxation loss ability help it to absorb more EM wave energy. Moreover, with a suitably strong fiber/matrix bonding strength, the composite can transfer load more effectively from matrix to fibers, resulting in a higher flexural strength (380 MPa) and fracture toughness (12.9 MPa▪m1/2).
KW - Ceramic matrix composites
KW - Electromagnetic absorption properties
KW - Mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85058977379&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.12.038
DO - 10.1016/j.jeurceramsoc.2018.12.038
M3 - 文章
AN - SCOPUS:85058977379
SN - 0955-2219
VL - 39
SP - 743
EP - 754
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -