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Aligned carbon nanotube-reinforced silicon carbide composites produced by chemical vapor infiltration
- Gu, Zhanjun, Yang, Yingchao, Li, Kaiyuan, Tao, Xinyong, Eres, Gyula, Howe, Jane Y., Zhang, Litong, Li, Xiaodong, Pan, Zhengwei
- Carbon 2011 v.49 no.7 pp. 2475-2482
- air, carbides, carbon, energy, nanotubes, silicon, vapors
- A chemical vapor infiltration (CVI) technique was used to overcome most of the challenges involved in fabricating exceptionally-tough CNT/SiC composites. Nanotube pullout and sequential breaking and slippage of the walls of the CNTs during failure were consistently observed for all fractured CNT/SiC samples. These energy absorbing mechanisms result in the fracture strength of the CNT/SiC composites about an order of magnitude higher than the bulk SiC. The CVI-fabricated CNT/SiC composites have an strongly-bonded tube/matrix interface and an amorphous, crack-free SiC matrix, enabling the composites to withstand oxidization at 700–1600°C in air.