Abstract
In order to improve the interlaminar properties of C/C composites, SiC whiskers were added to the carbon matrix. C/C composites with 0, 2.5, 5.0 vol.% of SiC whiskers were examined by short beam shear, DCB and ENT tests. Other mechanical properties, such as flexural and tensile properties, were also evaluated for each specimen. Results showed that SiC whisker addition drastically improved interlaminar shear strength (ILSS) and interlaminar fracture toughness, though C/C composites with 5.0 vol.% of SiC whiskers showed a 20% decrease in tensile strength. Observation of microstructure and crack extension during fracture toughness tests revealed that main effects of SiC whisker addition were reduction in density of intrinsic cracks and change in fracture mode mainly due to reinforcement of the fiber-rich layer/matrix interface.
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