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22–28 Jun 2019
DoubleTree at the Entrance to Universal Orlando
America/New_York timezone

RF plasma based Nanostructurization of Tungsten for Plasma Facing Component Material Applications

28 Jun 2019, 11:00
15m
Gold Coast III/IV (Double Tree at the Entrance to Universal Orlando)

Gold Coast III/IV

Double Tree at the Entrance to Universal Orlando

Oral 4.7 Plasma Material Interactions 4.7 Plasma Material Interactions

Speaker

Prof. Rajdeep Singh RAWAT (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University)

Description

Abstract
Tungsten is the choice for first wall material for future nuclear fusion reactors owing to its properties like high melting point, good ablation resistance, good thermal conductivity, low deuterium/tritium retention etc. The thermal and radiation loads within experimental nuclear fusion reactors like ITER is expected extremely high in the diverter region where the transient and continuous loads are the highest. The mechanical properties of tungsten thus needs to be improved without affecting other thermal and adsorption properties. It is known that nanostructurization of the material surface can lead to better mechanical properties. This paper deals with the improvement of the surface hardness of tungsten substrates by surface nanostructurization using RF plasma. Tungsten substrates were exposed to a capacitively coupled RF plasma in an N2 environment to nanostructurize its surface. The plasma parameters were studied using optical emission spectroscopy and a Langmuir probe. The exposure conditions were optimized so that nanostructures of required dimensions could be achieved. The surface morphology and the chemical structure was studied using SEM and XPS spectroscopy while the surface hardness was studied using a nano-indentor. In order to study the performance of the treated tungsten samples to fusion conditions, the substrates were then exposed to the focused mode operation of the dense plasma focus device and the changes in morphology and hardness were measured.

Authors

Mr Mayank Mishra (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University) Dr Rohit Medwal (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore) Ms J. Q. Pan (Hwa Chong Institute) Mr N. L. Wang (Hwa Chong Instituition) Mr J. H. Xu (Hwa Chong Institution) Prof. Paul Lee (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University) Prof. Rajdeep Singh RAWAT (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University) Dr Joseph Vimal Vas (Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University)

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