Abstract
Although SiC/SiC composites are expected to be used as advanced composite materials due to their superiorities in strength-to-weight and stiffness-to-weight ratios, there have been few reports on the internal friction of SiC-based composite materials. In this study, PIP, HP and CVI methods were employed as fabrication processes of SiC-based composites. In the case of the composite produced by the CVI process, by controlling the conditions of manufacturing and thermal annealing, a stable peak of internal friction due to the grain boundary relaxation was obtained at about 1200 K. It was found that this peak was affected not by the property of the fiber but the microstructure of the matrix and the temperature of the peak moved to the lower side after heat treatment at 1773 K. Also, it is expected that SiC/SiC composites may have a greater high-damping property by crystallizing the matrix.
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