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New approach to the problem of cathode wear in DC arc plasma torches

Kavka, T. and Arnold, Johannes and Ansar, Seyed Asif and Kupke, Thomas and Schneider, Gottfried (2008) New approach to the problem of cathode wear in DC arc plasma torches. In: International Thermal Spray Conference 2008, ITSC 2008, pp. 535-540. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH. ITSC 2008, 2008-06-02 - 2008-06-04, Maastricht, The Netherlands. ISBN 978-3-87155-979-2

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High heat load on the surface of electrodes in DC arc plasma torches results in strong wear of electrodes. This takes place during the start up and shutting down procedure as well as during long-term running of the torch and results in arc voltage reduction. Such changes in voltage lead to a modification of the plasma jet properties and effect adversely reproducibility of deposits, which are undesirable for industrial applications. The present work offers a new approach to compensate cathode wear in DC arc gas stabilized plasma torches by using moveable anode. With this design of torch, the distance between the cathode tip and anode can be varied. Voltage fluctuation analysis show the possibility of a reasonable arc modification by approaching the nozzle to the cathode caused by a change of the flow field inside the arc chamber and the arc dynamics. Smaller cathode tip-nozzle distances result in higher arc voltage with reduced fluctuations accompanied by a positive effect on the plasma jet properties. Thus, the negative influence of cathode wear on generated plasma properties can be suppressed and the lifetime of the cathode can be extended by simple approaching the nozzle.

Item URL in elib:https://elib.dlr.de/54523/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:New approach to the problem of cathode wear in DC arc plasma torches
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kavka, T.Institute of Plasma Physics, Praha/CZUNSPECIFIED
Date:June 2008
Journal or Publication Title:International Thermal Spray Conference 2008
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume:ITSC 2008
Page Range:pp. 535-540
Lugscheider, E.UNSPECIFIED
Publisher:Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH
Keywords:DC arc plasma torches, cathode wear, electrodes, voltage fluctuation
Event Title:ITSC 2008
Event Location:Maastricht, The Netherlands
Event Type:international Conference
Event Dates:2008-06-02 - 2008-06-04
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Arnold, Dr.-Ing. Johannes
Deposited On:04 Nov 2008
Last Modified:27 Apr 2009 15:02

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