Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7215705 | Composites Science and Technology | 2014 | 6 Pages |
Abstract
The present work reports on the strength and toughness enhancement due to carbon nanotube (CNT) presence in silicon carbide-matrix composites reinforced by CNT-coated carbon fibers (CNT-C/SiC). The composites were prepared via a chemical vapor infiltration/electrophoretic deposition methodology which enables CNT-coating of reinforcing fibers at varying load fractions. Both the tensile strength and toughness were found to first increase and then decrease with CNT electrophoretic deposition time, hence also CNT loading. The optimized deposition time turned out to be 10Â min where excellent mechanical properties were obtained and for instance, tensile strength and work of fracture reached their maximum of 392Â MPa and 1869.4Â kJ/m3, respectively. Scanning electron microscopy observations of CNT-C/SiC fracture surfaces showed that the magnitude of the fiber pull-out phenomenon increased significantly compared with pristine C/SiC. Abundant CNT pull-out within the CNT-rich layers around the fibers acted complementary to carbon fiber pull-out and was identified as the main toughening mechanism.
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Engineering (General)
Authors
Hui Mei, Qianglai Bai, Tianming Ji, Haiqing Li, Laifei Cheng,