Abstract
Carbon-carbon composites are important structural materials for high-temperature environments. Their thermal properties and microscopic structures change with the temperature and the time required for heat treatment. It is expected that the thermal diffusivity and porosity will show different values at every moment during heat treatment. The objective of this study is to evaluate the time dependence of the thermal diffusivity and porosity simultaneously using the electromagnetic ultrasonic technique. This report describes the thermal diffusivity measurement of type 304 stainless steel and a two-dimensional weave carbon-carbon composite at room temperature, and the analyses of the eddy current and heat conduction to clarify the influence of the distribution of induction heating for thermal diffusivity measurement.
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