Laser melting deposited self-passivating 90W-10Cr coatings on reduced activation ferritic/martensitic steel using 90W-7Ni-3Fe interlayers

Performance and evolution of W/steel joint fabricated by selective laser melting

“…The huge thermal and neutron loads faced by plasma facing components (PFC) represent a major challenge for next generation fusion devices, as both lead to degradation of physical and mechanical properties. Currently, tungsten (W) [1][2][3] as a component (which serves as a plasma facing material) connected to steels [4][5][6] (which are functionalised as the heat sink material) has been considered as one of the most promising PFC. The W block is expected to prevent sputtering and erosion because of its high melting point, good thermal conductivity, and low erosion rate, whereas the steels with cooling ducts serve as a reliable structural material owing to their good thermo-physical and mechanical properties.…”

“…For the case of solid-state diffusion bonding, superior compatibility and solid solubility of constituent elements is required along with the absence of brittle alloy phases (mostly Fe 7 W 6 ) [6]. However, for the PFC system of W/steel, the results of solid-state diffusion bonding are not satisfying because of the generation of brittle phases.…”

“…Currently, Ni, Ti, V, and Cu [9-13] have been developed, and there is still room for improvement because of issues such as neutron irradiation transmutation-radioactivity, low thermal conductivity, and insufficient joint strength. For the case of solid-state diffusion bonding, superior compatibility and solid solubility of constituent elements is required along with the absence of brittle alloy phases (mostly Fe 7 W 6 ) [6]. However, for the PFC system of W/steel, the results of solid-state diffusion bonding are not satisfying because of the generation of brittle phases.…”