Original title: Tungsten coatings and free standing parts
Authors: Brožek, Vlastimil ; Ctibor, Pavel ; Matějíček, Jiří ; Mušálek, Radek ; Weiss, Z.
Document type: Papers
Conference/Event: METAL 2013 - International Conference on Metallurgy and Materials /22./, Brno (CZ), 2013-05-15 / 2013-05-17
Year: 2013
Language: eng
Abstract: Tungsten powders, 20 – 100 µm in size, were melted in the jet of thermal plasma generated by a water-stabilized spray system WSP®. The molten tungsten was deposited on steel and graphite or boron nitride substrates, whereas the spray-ability itself was tested as well as cohesion with other substrates. One of the goals of this experimentation was to gain skills for covering variously shaped walls of nuclear fusion devices (Tokamaks). Also spraying of free-standing tungsten bodies was realized, by means of substrates easily machainable-out after deposition, as graphite and BN. Other option consists of covering a tungsten mesh or plates armored with tungsten wires. Protection of tungsten against oxidation in the plasma jet was a problem to be solved – the best results were gained with shroud gas, Ar with 7% hydrogen, and simultaneous placement of the substrates into graphite cells. The whole spray process was maintained to avoid temperatures over 700°C at which the oxidation is
Keywords: plasma spraying; protection against oxidation; shrouding; tungsten coatings; tungsten filters; tungsten plasma spraying
Project no.: GAP108/12/1872 (CEP)
Funding provider: GA ČR
Host item entry: METAL 2013 Conference Proceedings: 22nd International Conference on Metallurgy and Materials, ISBN 978-80-87294-39-0

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0223892

Permalink: http://www.nusl.cz/ntk/nusl-156477


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