Silicon carbide fibres have proven to be an excellent reinforcement material in cermaics and other composites due to their high strenth and stiffness and good thermomechanical stability. The thermal diffusivity/conductivity of SiC based fibres ahd been reported earlier [1]. The methods used so far for the fibres have been mainly indirect and based on using a composite of known composition and then applying a standard thermal conductivity measurement on that system. Fiber properties have further been obtained from an inversion calculation. Direct measurement data of fibre properties has not been available.
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