The dielectric and microwave absorption properties of polymer-derived SiCN ceramics
The dielectric and microwave absorption properties of polymer-derived SiCN ceramics
复制标题
聚合物SiCN陶瓷的介电和微波吸收性能
DOI：
10.1016/j.jeurceramsoc.2017.10.031
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发表时间：
2018-04-01
影响因子：
5.7
通讯作者：
Zhang, Yujun
中科院分区：
文献类型：
--
作者：
Guo, Xue;Feng, Yurun;Zhang, Yujun
在不同的退火温度(900~1400℃)下合成了聚合物基氮化硅陶瓷。采用X射线衍射仪、扫描电子显微镜、傅立叶变换红外光谱、拉曼光谱和X射线光电子能谱等分析手段对其物相组成和微观结构进行了分析。结果表明，随退火温度的升高，合金的晶化程度和游离碳含量逐渐提高。研究了样品在2~18 GHz的电阻率、介电和微波吸收性能。随着热处理温度的升高，薄膜的电阻率逐渐降低。在1~5 MHz频率范围内，样品的介电常数随频率的增加而减小。游离碳的存在可以改善聚合物基氮化硅陶瓷的高频介电性能。在1100℃下合成的样品在6~16 GHz的较宽频率范围内的反射率低于-10分贝(>；90%)，介电损耗角正切值在16 GHz处最大值约为0.6。
The polymer-derived SiCN ceramics were synthesized at different annealing temperature (900 similar to 1400 degrees C). The XRD, SEM, FT-IR, Raman and XPS were used to analyze the phase composition and microstructure. The result indicated that the crystallization degree and content of free carbon gradually improved with the increase of annealing temperature. The resistivity, dielectric and microwave absorption properties of the samples were studied at 2 similar to 18 GHz. The resistivity decreased gradually as the annealing temperature rose. The dielectric constant of sample decreased with the increase of frequency in 1 similar to 5 MHz. The existence of free carbon could improve the dielectric properties of polymer-derived SiCN ceramics at high frequency. The reflectance of the sample synthesized at 1100 degrees C was below -10 dB (> 90% absorption) in a wide frequency range of 6 similar to 16 GHZ and the maximum value of dielectric loss angle tangent was about 0.6 at 16 GHz.