Nanobrazing of tungsten to reduced activated ferritic-martensite steel as the plasma-facing structure

Due to significant differences in melting points and CTE, it is challenging to weld tungsten to reduced activated ferritic-martensite steel (RAFM). Brazing appears as a feasible technical solution. However, due to intermetallics, the mechanical reliability using conventional brazing fillers is questionable. Nanobrazing, using nanomaterials as brazing fillers, is promising to address this issue. In this talk, I will introduce the vacuum brazing of tungsten to RAFM using nano Fe, Ti, and a mixing composite. The strong bonding is achieved. The microstructure features and mechanical properties are systematically characterized.