TY - JOUR
T1 - Dielectric and microwave absorption properties of polymer derived SiCN ceramics annealed in N2 atmosphere
AU - Li, Quan
AU - Yin, Xiaowei
AU - Duan, Wenyan
AU - Hao, Binglei
AU - Kong, Luo
AU - Liu, Xingmin
PY - 2014/3
Y1 - 2014/3
N2 - Porous SiCN ceramics were successfully fabricated by pyrolysis of a kind of polysilazane. The effects of annealing temperature on the microstructure evolution, direct-current electrical conductivity, dielectric properties, and microwave absorption properties of SiCN in the frequency range 8.2-12.4GHz (X-band) were investigated. With the increase of annealing temperature, SiC, Si3N4 and free carbon nanodomains are gradually formed in the SiCN. Both the SiC and free carbon nanodomains lead to the increases of the complex relative permittivity and loss tangent of SiCN. With the increase of the annealing temperature, the average real permittivity, imaginary permittivity and loss tangent increase from 4.4, 0.2 and 0.05 to 13.8, 6.3 and 0.46, respectively. The minimum reflection coefficient and the frequency bandwidth below -10dB for SiCN annealed at 1500°C are -53dB and 3.02GHz, indicating good microwave absorption properties.
AB - Porous SiCN ceramics were successfully fabricated by pyrolysis of a kind of polysilazane. The effects of annealing temperature on the microstructure evolution, direct-current electrical conductivity, dielectric properties, and microwave absorption properties of SiCN in the frequency range 8.2-12.4GHz (X-band) were investigated. With the increase of annealing temperature, SiC, Si3N4 and free carbon nanodomains are gradually formed in the SiCN. Both the SiC and free carbon nanodomains lead to the increases of the complex relative permittivity and loss tangent of SiCN. With the increase of the annealing temperature, the average real permittivity, imaginary permittivity and loss tangent increase from 4.4, 0.2 and 0.05 to 13.8, 6.3 and 0.46, respectively. The minimum reflection coefficient and the frequency bandwidth below -10dB for SiCN annealed at 1500°C are -53dB and 3.02GHz, indicating good microwave absorption properties.
KW - Dielectric property
KW - Polymer derived SiCN ceramics
KW - SiC
KW - SiN
UR - http://www.scopus.com/inward/record.url?scp=84888427752&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2013.08.042
DO - 10.1016/j.jeurceramsoc.2013.08.042
M3 - 文章
AN - SCOPUS:84888427752
SN - 0955-2219
VL - 34
SP - 589
EP - 598
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 3
ER -