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Reports from Northwestern Polytechnic University Add New Data to Findings in Carbon Research (Floating catalyst chemical vapor infiltration of...

July 11, 2014



Reports from Northwestern Polytechnic University Add New Data to Findings in Carbon Research (Floating catalyst chemical vapor infiltration of nanofilamentous carbon reinforced carbon/carbon composites - Densification behavior and matrix ...)

By a News Reporter-Staff News Editor at Science Letter -- Current study results on Carbon Research have been published. According to news reporting originating from Xi'an, People's Republic of China, by NewsRx correspondents, research stated, "Nanofilamentous carbon (NFC) reinforced carbon/carbon composites were prepared by floating catalyst film boiling chemical vapor infiltration from xylene pyrolysis at 1000-1100 degrees C using ferrocene as a catalyst. The influence of the catalyst content on the densification behavior and matrix microstructure of the composites was studied."

Our news editors obtained a quote from the research from Northwestern Polytechnic University, "Results showed that the deposition rate of pyrocarbon (PyC) was enhanced remarkably by the catalyst. The density of the composites deposited at a catalyst content of 0-2.0 wt% decreased along both the axial and the negative radial directions. Rough laminar (RL) PyC matrix was formed at 0-0.8 wt% catalyst content by heterogeneous nucleation and growth. A hybrid matrix consisting of RL and isotropic (ISO) PyCs appeared at a catalyst content of 1.22.0 wt%. The reasons for this ISO PyC formation were attributed to the deposition of carbon encapsulated iron particles and homogeneous nucleation. A reinforcing network composed of NFCs and vapor grown carbon fibers was formed on the fiber/matrix interface and within the matrix in this floating catalyst process."

According to the news editors, the research concluded: "The structure of NFC transformed from nanotube to nanofiber when the catalyst content was over 0.5 wt%, around which composites of a high density of 1.75 g/cm(3) and uniform RL PyC matrix were produced rapidly."

For more information on this research see: Floating catalyst chemical vapor infiltration of nanofilamentous carbon reinforced carbon/carbon composites - Densification behavior and matrix microstructure. Carbon, 2014;75():353-365. Carbon can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Carbon - www.elsevier.com/wps/product/cws_home/258)

The news editors report that additional information may be obtained by contacting K.Z. Li, Northwestern Polytechnic Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, People's Republic of China. Additional authors for this research include H.L. Deng, H. Cui, H.J. Li, J. Xie, J.H. Zheng and C. Wang (see also Carbon Research).

Keywords for this news article include: Asia, Xi'an, Carbon Research, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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