Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 1, Pages 233-243Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.06.020
Keywords
Silicon carbide; Carbon nanotubes; Three-dimensional network; Composites; Heat resistance
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Funding
- Air Force Office of Scientific Research [FA9550-16-1-0173]
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This study successfully fabricated anisotropic and low-density carbon nanotube/SiC core-shell structures with excellent mechanical strength and heat resistance. The preparation method is simple and scalable, and the density of the synthesized SiC nanotubes is the lowest reported.
Synthesis of silicon carbide (SiC) nanostructures and their composites has been a topic of interest for the scientific community due to the unique properties that can be obtained with nanoscale features. Herein, we report the scalable fabrication of anisotropic and low density, carbon nanotube/SiC (CNT/SiC) core-shell structures synthesized via chemical vapor infiltration (CVI) of silicon on aligned CNT foams followed by heat treatment at 1350 degrees C. Structures made of CNT/SiC nanotube networks with a thickness of 1 cm and length of 9 cm were prepared in the present work. Upon the removal of the CNT foam via calcination of the hybrid nanocomposite in air, a free-standing mechanically robust three-dimensional network of pure SiC nanotubes was left behind. The density of the synthesized CNT/SiC is the lowest reported for any C/SiC structure. Furthermore, the CNT/SiC hybrid nano-architecture demonstrated superb heat resistance and stability in ultrahigh temperature environment.
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