所属单位：材料科学与工程学院

发表刊物：Ceramics International Conference on Advances in Chemical Technologies for Water and Wastewater Treatment（CCS-Xian2008）

关键字：中文关键字：电磁屏蔽，英文关键字：SiCf/SiC composites; Electromagnetic interference

摘要：SiCf/SiC composites containing PyC interphase were prepared by chemical vapor infiltration and their properties were investigated for electromagnetic interference (EMI) shielding applications in the frequency of 8.2–12.4 GHz. The room temperature direct current electrical conductivity (sdc) and EMI shielding effectiveness (SE) were tested after thermal oxidation for various time at 900 1C. It was found that the EMI was shielded mainly by absorption for both as-received and oxidized SiCf/SiC composites. Both sdc and SE of SiCf/ SiC composites decrease after thermal oxidation at 900 1C. It was proposed that the free carbon, including PyC interphase and free carbon in matrix and fibers, mainly determines the EMI SE of composites. The decrease of sdc and SE of composites after oxidation are attributed to the consumption of free carbon. The SE of SiCf/SiC composites with a thickness of 2 mm remains above 15 dB after thermal oxidation for 4 h in air at 900 1C.

备注：丁冬海

第一作者：丁冬海

论文类型：期刊论文

卷号：卷：39

期号：期：4

页面范围：页：4281-4286

是否译文：否

发表时间：2013-04-01