TY - JOUR
T1 - Effect of SiBCN content on the dielectric and EMW absorbing properties of SiBCN-Si3N4 composite ceramics
AU - Zhao, Mingxi
AU - Liu, Yongsheng
AU - Chai, Nan
AU - Qin, Hailong
AU - Liu, Xiaofei
AU - Ye, Fang
AU - Cheng, Laifei
AU - Zhang, Litong
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/4
Y1 - 2018/4
N2 - Siliconboron carbonitride ceramics (SiBCN) were introduced into porous Si3N4 substrates via low pressure chemical vapor deposition and infiltration from SiCl3CH3-NH3-BCl3-H2-Ar system. To improve the electromagnetic wave(EMW) absorbing properties, the molar ratio, nCH3SiCl3/(nNH3 + nBCl3), was increased based on thermodynamics analysis. The results show that nanosized silicon carbide crystals and free carbon dispersed uniformly in the amorphous SiBCN phase, resulting in suitable dielectric properties and improved absorption capabilities of SiBCN-Si3N4 ceramics. Additionally, with increasing SiBCN ceramics loading, the amount of nanocrystals and interface between nanocrystals and amorphous SiBCN phase increased, leading to enhanced polarization and dielectric loss of the composite ceramics. When SiBCN content was up to 3.64 wt%, the electromagnetic reflection coefficient (RC) of SiBCN-Si3N4 composite ceramics reached −40 dB (>99.97% absorbing) with the effective electromagnetic absorbing bandwidth of 3.64 GHz in the X-band. This study makes it possible to fabricate SiBCN-based composite materials with excellent EMW absorbing properties at a low temperature.
AB - Siliconboron carbonitride ceramics (SiBCN) were introduced into porous Si3N4 substrates via low pressure chemical vapor deposition and infiltration from SiCl3CH3-NH3-BCl3-H2-Ar system. To improve the electromagnetic wave(EMW) absorbing properties, the molar ratio, nCH3SiCl3/(nNH3 + nBCl3), was increased based on thermodynamics analysis. The results show that nanosized silicon carbide crystals and free carbon dispersed uniformly in the amorphous SiBCN phase, resulting in suitable dielectric properties and improved absorption capabilities of SiBCN-Si3N4 ceramics. Additionally, with increasing SiBCN ceramics loading, the amount of nanocrystals and interface between nanocrystals and amorphous SiBCN phase increased, leading to enhanced polarization and dielectric loss of the composite ceramics. When SiBCN content was up to 3.64 wt%, the electromagnetic reflection coefficient (RC) of SiBCN-Si3N4 composite ceramics reached −40 dB (>99.97% absorbing) with the effective electromagnetic absorbing bandwidth of 3.64 GHz in the X-band. This study makes it possible to fabricate SiBCN-based composite materials with excellent EMW absorbing properties at a low temperature.
KW - Chemical vapor deposition and infiltration
KW - Dielectric properties
KW - Electromagnetic wave absorbing properties
KW - Siliconboron carbonitride ceramics
UR - http://www.scopus.com/inward/record.url?scp=85031317419&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2017.10.021
DO - 10.1016/j.jeurceramsoc.2017.10.021
M3 - 文章
AN - SCOPUS:85031317419
SN - 0955-2219
VL - 38
SP - 1334
EP - 1340
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -