Fabrication of multi-walled carbon nanotube-reinforced carbon fiber/silicon carbide composites by polymer infiltration and pyrolysis process

Multi-walled carbon nanotube (MWNT)-reinforced carbon fiber/silicon carbide (Cf/SiC) composites were prepared using a polymer infiltration and pyrolysis (PIP) process. The MWNTs used in this study were modified using a chemical treatment. The MWNTs were found to be well dispersed in the matrix after ultrasonic dispersion, and the mechanical properties of the Cf/SiC composite were significantly improved by the addition of MWNTs. The addition of 1.5 wt.% of MWNTs to the Cf/SiC composite led to a 29.7% increase in the flexural strength, and a 27.9% increase in the fracture toughness.