This title appears in the Scientific Report : 2020 

Thermal fatigue behavior of functionally graded W/EUROFER-layer systems using a new test apparatus
Emmerich, Thomas (Corresponding author)
Vaßen, Robert / Aktaa, Jarir
Werkstoffsynthese und Herstellungsverfahren; IEK-1
Fusion engineering and design, 154 (2020) S. 111550 -
New York, NY [u.a.] Elsevier 2020
10.1016/j.fusengdes.2020.111550
Journal Article
Methods and Concepts for Material Development
Published on 2020-02-18. Available in OpenAccess from 2022-02-18.
Published on 2020-02-18. Available in OpenAccess from 2022-02-18.
Please use the identifier: http://dx.doi.org/10.1016/j.fusengdes.2020.111550 in citations.
Please use the identifier: http://hdl.handle.net/2128/24506 in citations.
In future fusion reactors tungsten coatings shall protect First Wall components, made of reduced activation ferritic martensitic steel, against the plasma, because of tungsten’s favourable thermo-mechanical properties and low sputtering yield. Functionally graded material layers implemented between the coating and the steel substrate, compensate the difference in the coefficient of thermal expansion. By using the vacuum plasma spraying technique several layer systems were successfully produced and tested, among other aspects, in regard to their thermal fatigue behaviour up to 500 thermal cycles in a vacuum furnace. However, higher numbers of thermal cycles are anticipated for future fusion reactors and, therefore, a less time consuming approach for thermal fatigue testing is required.Hence, a new testing apparatus with induction heating and inert gas cooling was built and first thermal fatigue experiments with up to 5000 cycles were carried out on different functionally graded tungsten/steel layers systems. The subsequent investigations of these samples show that the layer systems are stable for the applied number of thermal cycles and their properties are solely determined during their respective coating processes.