Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers

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	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
	2012
发表期刊	Carbon
ISSN	0008-6223
卷号	50 期号:7 页码:2424-2430
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.
部门归属	[liu, yequn; he, lianlong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [lu, xuefeng; xiao, peng] cent s univ, state key lab powder met, changsha 410083, peoples r china. [liu, yequn] chinese acad sci, grad univ, beijing 100049, peoples r china.;he, ll (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;llhe@imr.ac.cn
关键词	Chemical-vapor-deposition Hot-wall Reactors Pyrolytic Carbon Mechanical-properties Surface-area Nanotubes Ratio Pyrocarbon Kinetics Infiltration
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60127
专题	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.