Improved dielectric and electromagnetic interference shielding properties of ferrocene-modified polycarbosilane derived SiC/C composite ceramics
Improved dielectric and electromagnetic interference shielding properties of ferrocene-modified polycarbosilane derived SiC/C composite ceramics
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二茂铁改性聚碳硅烷衍生的 SiC/C 复合陶瓷改善介电和电磁干扰屏蔽性能
DOI：
10.1016/j.jeurceramsoc.2014.02.010
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发表时间：
2014-09
影响因子：
5.7
通讯作者：
Yin XW
中科院分区：
文献类型：
--
作者：
Li Quan;Yin Xiaowei;Duan Wenyan;Kong Luo;Liu Xingmin;Cheng Laifei;Zhang Litong;Yin XW
为了提高碳化硅陶瓷的介电和电磁屏蔽性能，采用二茂铁改性聚碳硅烷热解法制备了碳化硅/碳化硅复相陶瓷。研究了碳化硅/碳化硅复相陶瓷的微观结构演变、介电性能、电磁干扰和微波吸收性能。随着二茂铁含量的增加和热处理温度的升高，碳化硅和碳化硅的结晶度增加。在该材料中得到了包括碳纳米线、涡流层状碳、洋葱状碳和石墨烯状碳在内的结晶碳。经5%二茂铁修饰的聚碳硅烷在1250℃热处理时，碳纳米线最长，在提高介电性能和电磁干扰性能方面比碳化硅起到了更重要的作用。材料的平均实介电常数和虚介电常数分别从4.4和0.7增加到38.9和39.6。材料表现出高的总屏蔽效能、高的吸收屏蔽效能和低的反射屏蔽效能，分别为36.6、30.1和6.5分贝。
In order to enhance the dielectric and electromagnetic interference shielding (EMI) properties, the SiC/C composite ceramics were fabricated by pyrolysis of ferrocene-modified polycarbosilane. The microstructure evolutions, dielectric properties, EMI and microwave absorption properties of SiC/C composite ceramics were investigated. The increases of both ferrocene contents and annealing temperatures led to the increases of crystallizations of SiC and carbons. Crystallized carbons including carbon nanowires, turbostratic carbons, onion-like carbons and graphene-like carbons were obtained in the materials. The carbon nanowires were longest when the 5 wt.% ferrocene-modified polycarbosilane was annealed at 1250 °C. These carbons played a more important role than SiC in the increases of dielectric and EMI properties. The average real and imaginary permittivities of materials increased from 4.4 and 0.7 to 38.9 and 39.6, respectively. The materials exhibited high total shielding effectiveness, high absorption shielding effectiveness and low reflection shielding effectiveness, which were 36.6, 30.1 and 6.5 dB, respectively.
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影响因子：
4.5
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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DOI：
10.1016/j.jeurceramsoc.2012.02.009
发表时间：
2012-08-01
影响因子：
5.7
作者：
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通讯作者：
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影响因子：
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作者：
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