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On tungsten spraying using inductively coupled plasma system - First results
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SYSNO ASEP 0498210 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title On tungsten spraying using inductively coupled plasma system - First results Author(s) Klečka, Jakub (UFP-V) ORCID
Mušálek, Radek (UFP-V) RID, ORCID
Vilémová, Monika (UFP-V) RID, ORCID
Lukáč, František (UFP-V) ORCIDNumber of authors 4 Source Title METAL 2017: 26th International Conference on Metallurgy and Materials: abstracts. - Ostrava : Tanger Ltd., 2017 - ISBN 978-80-87294-73-4 Pages s. 1321-1326 Number of pages 6 s. Publication form Print - P Action 26th International Conference on Metallurgy and Materials Event date 24.05.2017 - 26.05.2017 VEvent location Brno Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords Radio frequency inductively coupled plasma torch ; tungsten ; plasma facing components ; plasma spraying Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects GA17-23154S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000434346900212 EID SCOPUS 85043388312 Annotation Thanks to its unique properties such as high melting point and density, tungsten and tungsten-based alloys are commonly used in a wide range of applications. Among others, these materials are promising candidates for the plasma facing components in the future fusion reactors. One of considered ways of production of these parts is plasma spraying. There are however several limitations for conventional gas stabilized torches, mainly in plasma enthalpy (i.e. the ability to efficiently melt tungsten particles in considerable feed rates) and susceptibility of tungsten to oxidation (which complicates spraying in oxidizing open-air atmosphere). The radio frequency inductively coupled plasma torch (RF-ICP) is a unique system which can potentially overcome both these problems and can be used for efficient tungsten spraying. The tungsten powder, which can be finer than the one used for the conventional systems, is fed axially into the hot plasma core, both factors lead to a more efficient melting of the particles. The deposition is performed in a chamber with controlled atmosphere of inert gas or decreased pressure, the oxidation is therefore suppressed. In this first study carried out with the newly commissioned RF-ICP system TekSpray 15 (Tekna), samples of tungsten coatings on graphite substrates were prepared. The X-ray diffraction and SEM images of the free surfaces and cross-sections were obtained, documenting high purity of the deposits and appropriate flattening of the splats leading to a dense coating microstructure. The effect of substrate preheating on the microstructure, porosity and hardness was also studied. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019
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