|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Functionally Graded Tungsten/EUROFER Coating for Plasma Facing Components of Fusion Power Plants
||Jarir Aktaa, Dandan Qu, Robert Va▀en, Marius Wirtz, Jochen Linke
|On-Site Speaker (Planned)
The reduced activation ferritic martensitic steel EUROFER shall be used as structural material for the first wall (FW) of fusion power plants. The interaction between plasma and FW, especially physical sputtering will limit the FW lifetime under normal operation. Therefore tungsten coating is selected to protect the FW due to its very low sputtering yield and high melting point. However, the mismatch in thermo-physical properties between tungsten and EUROFER can lead to large residual thermal stresses and even failure. To overcome this tungsten coating with tungsten/EUROFER functionally graded (FG) interlayer on EUROFER substrate are developed and optimized. The coating and the FG interlayer are produced by vacuum plasma spraying with parameters optimized by modelling and evaluated by means of microstructural and micromechanical investigations, thermal shock, thermo-mechanical fatigue as well as fracture mechanical experiments. The results reveal the good quality of the coatings and verify the success of the approach pursued.