Abstract In order to improve the mechanical properties of CBCFCs, the CBCFCs with in-situ grown SiC nanowires (SiCNW) were fabricated based on the chemical vapor reaction process and precursor impregnation… Click to show full abstract
Abstract In order to improve the mechanical properties of CBCFCs, the CBCFCs with in-situ grown SiC nanowires (SiCNW) were fabricated based on the chemical vapor reaction process and precursor impregnation and pyrolysis (PIP) process. The effect of multi-scaled reinforcements (micro-scaled carbon fibers and nano-scaled SiCNW) on the mechanical properties was investigated. The phase, microstructure and fracture surface of the composites were characterized by XRD, SEM and TEM. Microstructure characterization found that the in-situ grown SiCNW randomly distributed in the matrix and formed a network structure in the CBCFCs. The carbon fibers and the SiCNW formed the multi-scaled reinforcements can significantly improve the mechanical properties of CBCFCs. More importantly, the orientation anisotropy on mechanical properties of the composites is also obviously deceased due to the in-situ grown SiCNW. The improved mechanical properties and decreased orientation anisotropy could be attributed to the pull-out and bridging of carbon fibers and SiCNW, which formed multi-scaled reinforcements.
               
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