IN-SITU GROWTH OF CARBON NANOTUBES IN THREE DIMENSIONAL NEEDLE-PUNCHED CARBON FABRICS AND HYBRID ENHANCEMENT TO C/SiC COMPOSITES

摘要

Multi-walled carbon nanotubes (CNTs) were grown by chemical vapor infiltration in three dimensional needle-punched carbon fiber felts. Systematical studies, by varying the reaction temperatures and the total pressure, were carried out in relation to morphology and quality of the products. The morphology of CNTs grown in the inner part of fiber felts were examined by scanning electron microscopy. Dense and uniform MWCNTs were drafted on the carbon fiber surface throughout the felt via controlling the reaction conditions. The composite reinforced with CNTs showed bundle pull-out mode due to enhancement of matrix intra bundles.