|
6443 |
|
Tungsten-steel composites prepared by RF plasma |
|
Jiri Matejicek* / Institute of Plasma Physics, Czech Republic Jakub Klecka/ Institute of Plasma Physics, CZ Jan Cizek/ Institute of Plasma Physics, CZ Jan Medricky/ Institute of Plasma Physics, CZ Vishnu Ganesh/ Forschungszentrum Juelich, DE Tomas Chraska/ Institute of Plasma Physics, CZ |
|
For the future fusion reactors, materials able to withstand harsh environments are needed. In particular, this concerns the plasma-facing components which are foreseen to consist of tungsten-based plasma-facing armor and structural and cooling part made of steel. Currently, the joining of these materials presents a significant challenge. The stress concentration at their interface, which arises due to thermal exposure and the difference in thermal and mechanical properties, can be reduced by composite/graded interlayers. Plasma spraying is among the prospective technologies for their preparation. In this work, tungsten-steel composites were prepared by RF-ICP spraying. Initial optimization of the spraying process was carried out, while the powder size, torch operating parameters and spraying pattern were varied. The optimization was aided by the in-flight particle diagnostics and characterization of the layers for their structure, porosity, phase composition and thermal properties. |