Preparation and Flexural Property of In-situ Vapor Grown Carbon Fibers Reinforced C/C Composites

The in-situ vapor grown carbon fibers (VGCFs) were synthesized by chemical vapor deposition (CVD) on carbon felt and C/C composites of different densities, using propylene as carbon resources and FeCl 3 6H 2 O as catalyst. And VGCFs-C/C composites were prepared on carbon felt and C/C composites of different densities with in-situ VGCFs. The effects of pressure in the reactor and density of the substrate on growth of VGCFs were investigated, and the morphology of in-situ VGCFs and the change of morphology of pyrolytic carbon on the substrate with in-situ VGCFs were observed by scanning electron microscope (SEM) and optical microscope. In addition, the flexural properties of C/C composites and VGCFs-C/C composites were investigated. Results show that low density of substrate is beneficial to the in-situ growth of VGCFs when the pressure in the reactor is 3700 Pa. In-situ VGCFs change the morphology of pyrolytic carbon, and induce the formation of the spherical structure, which can enhance the interface bonding force like nails doing. Therefore, the flexural strength of sample with high content of VGCFs is improved.