Characterization of the Microstructure of Three‐Dimensional‐Needled Carbon/Silicon Carbide Composites

Three‐dimensional‐needled, carbon‐fiber‐reinforced silicon carbide matrix composites (C/SiC) were prepared by a chemical vapor infiltration and reactive melt infiltration method. It was found that two kinds of SiC existed in the C/SiC composites, that is, micro‐β‐SiC grains within the range of 5–15 μm and nano‐β‐SiC grains with a size of about 100 nm. The interface of C/SiC and the distribution of SiC showed evidence for the reaction mechanism of the reactive melt infiltration process.