Development of flexible filler ribbons by melt spinning for joining W to CuCrZr material for heat sink application
This paper studies the use of the melt-spinning technique as an alternative filler fabrication route to obtain flexible 80Cu-20Ti ribbons, which presents flexible and adaptability properties to cover the divertor or first wall pipe in future fusion reactors. The results showed that best conditions are achieved using a 0.8 mm diameter of the nozzle and 30 m/s of the linear wheel-speed. This condition allows to change the microstructure of the fabricated ribbons giving rise to a lower Cu4Ti intermetallic phase formation enhancing the adaptability properties. Ribbon dimensions are high enough to cover the perimeter of the pipe. Best conditions were selected to use as filler material in W-CuCrZr brazed joints at 960 ◦C. The results showed the consecution of high metallic continuity interfaces. Besides, the selected brazing conditions did not cause any thermal effect in the W base material but caused a softening effect in the CuCrZr base material as a consequence of the coarsening process of the hardening precipitates.
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The authors would also like to acknowledge the Community of Madrid in the framework of the Multiannual Agreement with the Rey Juan Carlos University in line of action 1, “Encouragement of Young Phd student's investigation" Project Ref. M 2168 Acronym DARUCEF. D. Salazar acknowledge support from the EU Horizon 2020 research and innovation programme under Grant Agreement No. 862617 – Multi-Fun.
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