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Investigation of Time-Dependent Instabilities of Plasma Spraying Process Using Online Diagnostic Systems

Arnold, Johannes and Syed, Asif and Weckmann, Hannes and Fiebig, Sven (2006) Investigation of Time-Dependent Instabilities of Plasma Spraying Process Using Online Diagnostic Systems. In: Proceedings of the 2006 International Thermal Spray Conference, 2006. ITSC 2006, 2006-05-15 - 2006-05-18, Seattle, Washington, USA. ISBN 0-87170-836-6

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Abstract

Reproducibility of plasma spray process and resulting deposits is one of the most essential requirements for its applications in industrial environment. In most cases, only controlling process input parameters does not suffice for achieving stability and reproducibility of the process. Besides short time period plasma instabilities such as arc root fluctuation, process deviations may arise in longer time operations due to electrodes wear and need to be identified by online diagnostics of the plasma spraying process. In this study two online diagnostic systems were employed to investigate the long-term behaviour of a F4-type plasma gun with a convergent and divergent Laval-nozzle. A Plasma Instability Analysis (PISA) system was applied to identify electrode wear and plasma fluctuation phenomena within the gun whereas Particle Flux Imaging (PFI) was used to correlate the electrode wear with the plasma jet characteristics at the nozzle exit. The long-term performance of electrodes was investigated under continuous operation or under periodic re-ignition of the torch. A good correlation between aberrations in the plasma process observed with PFI and changes in the frequency spectra detected by PISA was found.

Item URL in elib:https://elib.dlr.de/45115/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Veröffentlichung durch den Herausgeber erfolgte per CD
Title:Investigation of Time-Dependent Instabilities of Plasma Spraying Process Using Online Diagnostic Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arnold, JohannesUNSPECIFIEDUNSPECIFIED
Syed, AsifUNSPECIFIEDUNSPECIFIED
Weckmann, HannesBMW GroupUNSPECIFIED
Fiebig, SvenBMW GroupUNSPECIFIED
Date:18 May 2006
Journal or Publication Title:Proceedings of the 2006 International Thermal Spray Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2006
Editors:
EditorsEmail
ASM International, UNSPECIFIED
ISBN:0-87170-836-6
Status:Published
Keywords:plasma spraying PISA PFI time-dependent instabilities frequency spectra
Event Title:ITSC 2006
Event Location:Seattle, Washington, USA
Event Type:international Conference
Event Dates:2006-05-15 - 2006-05-18
Organizer:ASM International
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:23 Oct 2006
Last Modified:12 Dec 2013 20:21

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