Sandwich-structured C/C-SiC composites fabricated by electromagnetic-coupling chemical vapor infiltration

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	Sandwich-structured C/C-SiC composites fabricated by electromagnetic-coupling chemical vapor infiltration
	Hu, Chenglong; Hong, Wenhu; Xu, Xiaojing; Tang, Sufang; Du, Shanyi; Cheng, Hui-Ming; Tang, SF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
刊名	NATURE PUBLISHING GROUP
	2017-10-13
卷号	7 页码:-
ISSN号	2045-2322
英文摘要	Carbon fiber (CF) reinforced carbon-silicon carbide (C/C-SiC) composites are one of the most promising lightweight materials for re-entry thermal protection, rocket nozzles and brake discs applications. In this paper, a novel sandwich-structured C/C-SiC composite, containing two exterior C/SiC layers, two gradient C/C-SiC layers and a C/C core, has been designed and fabricated by two-step electromagnetic-coupling chemical vapor infiltration (E-CVI) for a 20-hour deposition time. The cross-section morphologies, interface microstructures and SiC-matrix growth characteristics and compositions of the composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively. Microstructure characterization indicates that the SiC growth includes an initial amorphous SiC zone, a gradual crystallization of SiC and grow-up of nano-crystal, and a columnar grain region. The sandwich structure, rapid deposition rate and growth characteristics are attributed to the formation of thermal gradient and the establishment of electromagnetic field in the E-CVI process. The composite possesses low density of 1.84 g/cm(3), high flexural strength of 325 MPa, and low linear ablation rate of 0.38 mu m/s under exposure to 5-cycle oxyacetylene flame for 1000 s at similar to 1700 degrees C.; Carbon fiber (CF) reinforced carbon-silicon carbide (C/C-SiC) composites are one of the most promising lightweight materials for re-entry thermal protection, rocket nozzles and brake discs applications. In this paper, a novel sandwich-structured C/C-SiC composite, containing two exterior C/SiC layers, two gradient C/C-SiC layers and a C/C core, has been designed and fabricated by two-step electromagnetic-coupling chemical vapor infiltration (E-CVI) for a 20-hour deposition time. The cross-section morphologies, interface microstructures and SiC-matrix growth characteristics and compositions of the composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively. Microstructure characterization indicates that the SiC growth includes an initial amorphous SiC zone, a gradual crystallization of SiC and grow-up of nano-crystal, and a columnar grain region. The sandwich structure, rapid deposition rate and growth characteristics are attributed to the formation of thermal gradient and the establishment of electromagnetic field in the E-CVI process. The composite possesses low density of 1.84 g/cm(3), high flexural strength of 325 MPa, and low linear ablation rate of 0.38 mu m/s under exposure to 5-cycle oxyacetylene flame for 1000 s at similar to 1700 degrees C.
学科主题	Multidisciplinary Sciences
语种	英语
资助机构	Major Program of Aerospace Advanced Manufacturing Technology Research Foundation of NSFC; CASC, China [U1537204]; Youth Innovation Promotion Association of Chinese Academy of Sciences [2014171]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79046]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tang, SF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Hu, Chenglong,Hong, Wenhu,Xu, Xiaojing,et al. Sandwich-structured C/C-SiC composites fabricated by electromagnetic-coupling chemical vapor infiltration[J]. NATURE PUBLISHING GROUP,2017,7:-.
APA	Hu, Chenglong.,Hong, Wenhu.,Xu, Xiaojing.,Tang, Sufang.,Du, Shanyi.,...&Tang, SF .(2017).Sandwich-structured C/C-SiC composites fabricated by electromagnetic-coupling chemical vapor infiltration.NATURE PUBLISHING GROUP,7,-.
MLA	Hu, Chenglong,et al."Sandwich-structured C/C-SiC composites fabricated by electromagnetic-coupling chemical vapor infiltration".NATURE PUBLISHING GROUP 7(2017):-.