The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure

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	The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure
	Z. G. Fang; C. S. Li; J. Y. Sun; H. T. Zhang; J. S. Zhang
	2010
发表期刊	New Carbon Materials
ISSN	1007-8827
卷号	25 期号:1 页码:15-21
摘要	SiC/C foams and their monoliths of the same compositions, with various electrical Conductivities were prepared by polymer sponge replication/carbonization and hot-press solidification/carbonization respectively. Both materials have a three-dimensionally connected pore Structure with the former on a macroscopic scale and the latter a microscopic scale. The electromagnetic parameters of the SiC/C foams and the monoliths Versus their electric conductivities were measured at a frequency of 2 450 MHz by the TE(10) resonant cavity perturbation method. Results show that when the electrical conductivities of the SiC/C foams and the monoliths increase gradually, their dielectric constants epsilon(r') increase gradually and their dielectric losses tg delta(e) exhibit a maximum. The magnetic loss tg delta(m) of the SiC/C foams increases Continually while that of the monoliths first increases quickly then decreases slowly with increasing electric conductivities. When the effective electric conductivities of the SiC/C foams and the monoliths are the same, the epsilon(r') Values of the SiC/C foams are about a half and the to partial derivative(e) values are at least 2 times larger than those of the monoliths, while the tg delta(m) values of the monoliths are more than 4 times those of the SiC/C foams. The SiC/C foams and the monoliths are both non-magnetic, and their magnetic losses are found to be caused by their special structures interacting with the incident electromagnetic waves. Thus it is apparent that this kind of magnetic loss is extrinsic.
部门归属	[fang zhi-gang; li chu-sen; sun jia-yan; zhang hong-tao; zhang jin-song] chinese acad sci, inst met res, shenyang 110016, peoples r china. [fang zhi-gang] taizhou univ, sch machine engn, taizhou 318000, peoples r china.;zhang, js (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;zhgfang@imr.ac.cn jshzhang@imr.ac.cn
关键词	Sic/c Foams Reticulated Structure Electromagnetic Loss Perturbation Method Extrinsically Magnetic Loss Carbon Foams Dielectric-properties X-band Composite Conductivity Black
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WOS记录号	WOS:000274776800003
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31090
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. G. Fang,C. S. Li,J. Y. Sun,et al. The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure[J]. New Carbon Materials,2010,25(1):15-21.
APA	Z. G. Fang,C. S. Li,J. Y. Sun,H. T. Zhang,&J. S. Zhang.(2010).The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure.New Carbon Materials,25(1),15-21.
MLA	Z. G. Fang,et al."The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure".New Carbon Materials 25.1(2010):15-21.