Enhanced microwave absorption properties of polymer-derived SiC/SiCN composite ceramics modified by TiC

被引:25
作者
Liu, Xiaoling [1 ,2 ]
Tang, Zhiming [1 ]
Xue, Jimei [1 ]
Wei, Hanjun [1 ]
Fan, Xiaomeng [1 ]
Liu, Yongsheng [1 ]
Cheng, Laifei [1 ]
机构
[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, West Youyi Rd 127, Xian 710072, Shaanxi, Peoples R China
[2] Xian ASN Technol Grp Co Ltd, Xian 710065, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
DIELECTRIC-PROPERTIES; CARBON NANOWIRES; RAMAN-SCATTERING; SI; INTERFACE; MECHANISM; BEHAVIOR; PERFORMANCE; PYROLYSIS; PRECURSOR;
D O I
10.1007/s10854-020-05193-7
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Porous SiCN(Ti) composite ceramics with good microwave absorbing performance were fabricated by pyrolysis of solid polysilazane modified by tetrabutyl titanate. The introduction of Ti not only acted as active filler to react with free carbon in the matrix to form TiC, but also played the role as catalyst to promote the formation of SiC nanowires. Finally, SiCN(Ti) composite ceramics formed a microstructure containing multi-nanophases and multi-nano heterogeneous interfaces when annealing temperature reached 1500 degrees C. The complex microstructure annealed at 1500 degrees C made composite ceramics have good matching impedance, as well as greatly increase the interfacial polarization loss and dipole polarization loss. As a result, the TiC/SiC/SiCN composite ceramics showed the excellent performance of electromagnetic wave absorption in X band. The minimum reflection loss (RL) of samples was - 17.1 dB at the thickness of 1.9 mm, and the maximum effective absorption bandwidth (EAB) of composite ceramics was 3.2 GHz when the thickness of sample was 2.1 mm, which exhibited a promising prospect as a structural and microwave absorbing integration material.
引用
收藏
页码:25895 / 25907
页数:13
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