Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 4, Pages 1334-1340Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.10.021
Keywords
Siliconboron carbonitride ceramics; Dielectric properties; Electromagnetic wave absorbing properties; Chemical vapor deposition and infiltration
Categories
Funding
- Chinese National Foundation for Natural Sciences [51472201, 51672217]
- Shaanxi International cooperation and exchange of scientific projects [2015KW-015]
- State Key Laboratory of Advanced Refractories [201501]
- Research Fund of the State Key Laboratory of Solidification Processing [120-TZ-2015]
- fundamental research funds for the central universities [3102014KYJD011]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201401]
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Siliconboron carbonitride ceramics (SiBCN) were introduced into porous Si3N4 substrates via low pressure chemical vapor deposition and infiltration from SiCl3CH3-NH3-BCl3-H-2-Ar system. To improve the electromagnetic wave (EMW) absorbing properties, the molar ratio, n(CH3SiCl3)/(n(NH3) + n(BCl3)), 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.
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