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Development of Structural Materials for Fusion and High Energy Reactors
Iron-based composites with high thermal conductivity
By appropriately arranging high thermal conductive materials in iron-based structural materials, the thermal conductivity of the entire structural materials can be dramatically improved. This will lead to the improvement of the efficiency of energy production and the reduction of radioactive waste, as well as the development of iron-based structural materials for fusion reactors and high energy reactor divertors, for which there has been no solution so far.
Research
This paper focuses on the low thermal conductivity of iron-based materials, which are expected to be used in actual DEMO reactors, with a view to the development of heat exchange devices facing to the plasma in operation, and is aimed at a significant improvement of thermal conductivity, which is considered to be the key to success. The 500°C temperature gradient near the cooling tube of the DEMO reactor divertor imposes a huge heat load that has never been experienced in engineering equipment before. On various iron-based materials (pure iron, reduced activation ferritic martensitic steel and oxide dispersion strengthened ferritic steel), Cu and W wires of high thermal conductivity are appropriately arranged to ensure strength as a structural material while serving as a heat sink.
Naoyuki Hashimoto Professor
