Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers | |
Y. Q. Liu ; L. L. He ; X. F. Lu ; P. Xiao | |
刊名 | Carbon |
2012 | |
卷号 | 50期号:7页码:2424-2430 |
关键词 | chemical-vapor-deposition hot-wall reactors pyrolytic carbon mechanical-properties surface-area nanotubes ratio pyrocarbon kinetics infiltration |
ISSN号 | 0008-6223 |
中文摘要 | Introduction of carbon nanofibers (CNFs) into carbon/carbon (C/C) composites is an effective method to improve the mechanical properties of C/C composites. In situ grown CNFs reinforced C/C composites as well as conventional C/C composites without CNFs were fabricated by chemical vapor infiltration. Transmission electron microscopy investigations indicate that the entangled CNFs (30-120 nm) formed interlocking networks on the surface of carbon fibers (CFs). Moreover, a thin high-textured (HT) pyrocarbon (PyC) layer (similar to 20 nm) was deposited on the surface of CFs during the growth of CNFs. We find the microstructure of C/C composites depends strongly on the local distribution density (LDD) of CNFs. In regions of low CNF LDD, a triple-layer structure was formed. The inner layer (attached to CF) is HT PyC (similar to 20 nm), the middle layer (150-200 nm) is composed of HT PyC coated CNFs (HT/CNFs) and medium-textured PyC, and the outmost layer (several microns) is composed of HT/CNFs and micropores. In regions of high CNF LDD, a double-layer structure was formed. The inner layer is HT PyC (similar to 20 nm), and the outer layer is composed of HT/CNFs, isotropic PyC and nanopores. However, only medium-textured PyC and micropores were found in the matrix of the conventional C/C composites. (C) 2012 Elsevier Ltd. All rights reserved. |
原文出处 | |
公开日期 | 2013-02-05 |
内容类型 | 期刊论文 |
源URL | [http://ir.imr.ac.cn/handle/321006/60127] |
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 | Y. Q. Liu,L. L. He,X. F. Lu,et al. Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers[J]. Carbon,2012,50(7):2424-2430. |
APA | Y. Q. Liu,L. L. He,X. F. Lu,&P. Xiao.(2012).Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers.Carbon,50(7),2424-2430. |
MLA | Y. Q. Liu,et al."Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers".Carbon 50.7(2012):2424-2430. |
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