An attractive blanket concept for the fusion reactor is the dual coolant Pb-17Li liquid (DCLL) breeder design. Reduced activation ferritic steel (RAFS) is used as the structural material. Helium is used to cool the first wall and blanket structure, and the selfcooled breeder Pb-17Li is circulated for power conversion and for tritium breeding. A SiC f /SiC composite insert is used as the magnetohydrodynamic (MHD) insulation to reduce the impact from the MHD pressure drop of the circulating Pb-17Li and as the thermal insulator to separate the high temperature Pb-17Li from the helium cooled RAFS structure.have proposed a test plan for the DCLL ITER-Test Blanket Module program.
The reactions between Nb and molten, eutectic In-Sn solder have been studied in the temperature range 130-240°C and for times ranging up to 12 months. Hexagonal platelet crystals of NbSn 2 form an intermetallic compound (IMC) layer that provides adhesion between solder and substrate, but which grows extremely slowly even at 200°C. A model explaining the observed IMC growth kinetics is developed and relevant activation energies and model parameters are calculated. Applications include high-temperature electronics interconnection, where the device is secured to the substrate via an adhesive component and the solder is designed to melt, preventing fatigue failure by temperature cycling.
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