IRFM designed, manufactured and qualified some mock-ups for DEMO divertor developped in a EUROfusion project. These components use an innovative material which resisted up to 25 MW/m2 heat fluxes.
In order to meet the extreme conditions experienced by the divertor of the DEMO reactor in terms of high heat flux (10 MW / m² stationary and 20 MW / m² transient) and neutronic flux (<10 dpa), several design options and materials are envisaged for this component. In the WP-DIV Eurofusion project, since 2014, different concepts are compared with the reference concept "ITER-LIKE" developed by ENEA. These concepts (developed by KIT, IPP, CCFE and CEA (IRFM)) mainly use tungsten as armor material and CuCrZr as structural material. These concepts seek to improve the bond between the armor and structural material which will have to withstand important thermomechanical stresses.
Thus, by substituting the copper interlayer (which is the case for the reference concept) with a Functionally Gradient Material (FGM), the concept developed by CEA (IRFM) aims at obtaining a gradual transition of the thermomechanical properties between the W and the CuCrZr, making it possible theoretically to improve the mechanical strength of the bond.
To manufacture such mock-ups with FGM interlayer, different tasks were carried out:
Such levels of performance are promising and will be consolidated by a second high heat flux testing campaign as well as metallographic inspections in 2017!
Last update : 02/15 2017 (583)