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Thermal cycle experiments of neutron-irradiated CFC/Cu mock-ups

This paper presents thermal cycle experiments of CFC/DSCu mock-ups to investigate the thermal performance and the durability of the joining interface between CFC and DSCu after neutron-irradiation. Test specimens have a duplex structure of a 1D or 2D CFC armor and dispersion strengthened copper (DSCu) heat sink. The 5 mm thick CFC armors were brazed onto the DSCu heat sink with 1 mm thick OFHC-Cu interlayer by a Cu-Ti-Ag braze. The dimensions of the specimens are 23 mml × 15 mmw × 22 mmh. These specimens were irradiated with neutron fluences of 0.3–0.5 dpa for CFC at an irradiation temperature of 280–320 °C. After the neutron irradiation, thermal cycle experiments were carried out under a heat load of 5 MW/m2 for 10 s to simulate the ITER steady state thermal conditions. As a result, all specimens withstood 1000 thermal cycles without failure. The surface temperature of 1D-CFC at 0.43 dpa reaches 650 °C while the surface temperature of non-irradiated 1D-CFC specimen is 250 °C. The surface temperature of 2D-CFC at 0.3 dpa reaches 800 °C. Higher surface temperature of the irradiated specimens can be attributable to a degradation of thermal conductivity of the CFC armors. The surface temperature of the 2D-CFC specimen irradiated at 0.45 dpa decreases from 1200 °C to 1000 °C during the thermal cycles, which could be caused by an annealing effect.