The electromagnetic loss characteristics of SiC/C materials with a three-dimensionally connected porous structure
文献类型：期刊论文
| 作者 | Z. G. Fang ; C. S. Li ; J. Y. Sun ; H. T. Zhang ; J. S. Zhang |
| 刊名 | New Carbon Materials
 |
| 出版日期 | 2010 |
| 卷号 | 25期号:1页码:15-21 |
| 关键词 | SiC/C foams Reticulated structure Electromagnetic loss Perturbation method extrinsically magnetic loss carbon foams dielectric-properties x-band composite conductivity black |
| ISSN号 | 1007-8827 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/31090]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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