HHF test with 50x100 Cu/SS mock-ups for verifying the joining technology of the ITER blanket FW

Through the fabrication of the Cu/SS joint specimen, fabrication procedure such as material preparation, canning, degassing, HIP (Hot Isostatic Presing), PHHT (Post HIP heat treatment) was established. The optimized HIP condition (1050 .deg. C 150MPa 2hr) was developed through the investigation on joint specimen fabricated with the various HIP conditions; the destructive tests of joint include the microstructure observation of the interface with the examination of the elemental distribution, tension test, bend test, Charpy impact test and fracture toughness test. However, since the joint should be tested under the High Heat Flux (HHF) conditions like the ITER operation for verifying its joint integrity, three HHF tests were performed at JEBIS in the present study. Two of them were survived up to more than the number of required cycle without any delamination or failure but one of them was deliminated in the joint during the test. However, the surface heat flux was 10 times higher than the ITER operation one and it was survived up to 600 cycles