| 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 | |
| Source Publication | New Carbon Materials
 |
| ISSN | 1007-8827 |
| Volume | 25Issue:1Pages:15-21 |
| Abstract | 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. |
| description.department | [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 |
| Keyword | Sic/c Foams Reticulated Structure Electromagnetic Loss Perturbation Method Extrinsically Magnetic Loss Carbon Foams Dielectric-properties X-band Composite Conductivity Black |
| URL | 查看原文 |
| WOS ID | WOS:000274776800003 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/31090 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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. |
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