Abstract
Using no catalyst, hafnium carbide nanowires (HfCnws) layer was in-situ synthesized and its controllable growth was realized on carbon/carbon (C/C) composites. Microstructural evolution from CNTs to HfCnws revealed that the growth of HfCnws was based on vapor-solid (VS) mechanism and root growth was the common growth type. Increased relative content of carbon source reduced the aspect ratio but promoted the transformation of HfCnws from single-prong growth to multiple-prong growth. After the introduction of HfCnws, the oxidation resistance of SiC coating was increased by 58.7%, which could be attributed to its improved toughness from the multiple-prong growth of HfCnws.
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