Two new inner contours of de Laval nozzles (V70, V21) for F4 torch, which have already successfully been established for the Atmospheric Plasma Spraying (APS) are investigated for application under Vacuum Plasma Spraying conditions (VPS). Studies have been performed with regard to power efficiency, sound level and arc voltage fluctuations as well as coating quality and deposition efficiency for use of CoNiCrAlY powder as feedstock material. The results are compared to the commonly used standard VPS nozzle. CFD calculations and enthalpy probe measurements of plasma gas velocity and temperature distribution in the centreline of the supersonic plasma jets are carried out in order to get insight in the basic dependencies.

atmospheric plasma spraying, cobalt-nickel-chromium-aluminum-yttrium powder, computational fluid dynamics, supersonic nozzles, vacuum plasma spraying
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Copyright © 2005 Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH. All rights reserved.
2005
ASM International
Topics
Thermal spray equipment Alloy powder Cobalt-nickel-chromium alloys Plasma spray coating Computational fluid dynamics
Issue Section:
Equipment and Processes
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