Development of Composite Material with Directional Property for High Thermal Conductivity for Divertor

摘要

The divertor is one of the high heat flux (HHF) components of fusion reactor which has to withstand a high surface heat flux. Tungsten has high thermal conductivity and expected to transfer heat, substrate of the diverter structure that carries coolant in it has lower thermal conductivity. The high temperature divertor will be needed for DEMO to efficiently use heat. In order to satisfy the requirements, multi-layer structure would be a possible option for HHF components. This concept will have a difficulty due to the different thermal conductivity and thermal stress because of high temperature gradient. To solve the above problem, C_f/SiC composite is first studied as a model material. Carbon fiber that has high thermal conductivity placed perpendicular to the flow of the coolant in C_f/SiC composite is expected to improve the directional thermal conductivity. Cf/SiC composite was evaluated in terms of mechanical properties and micro structures as structural materials. Thermal conductivity of C_f/SiC composite will be evaluated as the next research.