Spraying of metallic powders by hybrid gas/water torch and the effects of inert gas shrouding

0370373 - ÚFP 2012 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Kavka, Tetyana - Matějíček, Jiří - Ctibor, Pavel - Hrabovský, Milan
Spraying of metallic powders by hybrid gas/water torch and the effects of inert gas shrouding.
DVS Berichte, vol. 276( Proceedings of the International thermal spray conference 2011). Vol. 276. Düsseldorf: DVS Media GmbH, 2011, s. 1373-1380. ITSC, 2011, 276. ISBN 978-3-87155-268-7.
[International Thermal Spray Conference 2011(ITSC2011). Hamburg (DE), 27.09.2011-29.09.2011]
Grant CEP: GA ČR GAP205/11/2070; GA MPO FR-TI2/702
Výzkumný záměr: CEZ:AV0Z20430508
Klíčová slova: Hybrid argon-water plasma torch * plasma spraying * shrouding
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
www.dvs-congress.de

A hybrid DC arc plasma torch, combining water and gas stabilization, offers a high flexibility in plasma characteristics. These can be controlled in a wide range by the torch operational parameters, such as arc current and secondary gas flow rate. In this study, their influence on plasma spraying of tungsten and copper was investigated. To suppress the in-flight oxidation of the metals, inert gas shrouding was applied. In-flight particle diagnostics, analysis of free-flight particles and coatings was performed for spraying experiments in the open atmosphere and with argon shrouding. Both in-flight particle behavior and coating properties were found to be sensitive to the torch parameters. The application of shrouding was found to affect particle in-flight parameters, reduce the oxide content in the coatings and generally improve their properties, such as thermal conductivity. However, different degree of these effects was observed for copper and tungsten.
Trvalý link: http://hdl.handle.net/11104/0204200