Development of Joining Technology for KO TBM

TBM(Test Blanket Module) is introduced to test the feasibility and practicability of the design concepts of tritium breeding high temperature blankets relevant to a future fusion power reactor, especially the next step beyond ITER DEMO. Materials for TBM are categorized into five parts: armor material, structural material, tritium breeding material, neutron multiplier, and coolant material. Table I demonstrates the materials briefly. In Korea, two types of TBM, i.e. He cooled solid breeder (HCSB) and He cooled molten Li Breeder (HCML), are considered. For the fabrication of TBM, the joining technology for Be (as an armor material) and ferritic-martensitic steel (as an structural material) is also developing by the Korea Atomic Energy Research Institute. In this paper, the joining of Be with FMS will be presented. The Be and FMS joined successfully by adopting (i) coating of a compliant layer, and (ii) diffusion barrier. The effect of the interlayer properties will be discussed in view of the diffusion and proper bonding strength