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5462 |
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Friday, June 09, 2017, Hall 26 10:20 AM Characterization & Testing Methods II |
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Energy efficient production of thermally-sprayed coatings through the use of modified twin wire arc spraying processes - final results of a bavarian research foundation funded project |
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Alexander Atzberger* / University of the Federal Armed Forces Munich, Germany Karsten Hartz-Behrend / University of Federal Armed Forces Munich (LPT), Germany Jochen Schein/ University of Federal Armed Forces Munich (LPT), Germany Werner Mayr/ University of Applied Sciences Munich, Germany Michal Szulc/ Zierhut Messtechnik GmbH, Germany Jochen Zierhut/ Zierhut Messtechnik GmbH, Germany Werner Krömmer/ Linde AG, Germany Markus Aumiller/ Federal-Mogul Friedberg GmbH, Germany Erich Abler/ ABLER GmbH & Co. KG, Germany |
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The main goal of the project was to investigate the influence of different gas properties, in combination with different spraying parameters, on twin wire arc spraying processes. For this purpose, investigations with several gas compositions (in specific nitrogen combined with ethene or hydrogen) have been carried out in order to characterize the dependencies between the gas flow, the gas velocities and the resulting particle behavior. The preheating of the process gas as well as the variation of the applied gas pressure up to 1,400 kPa were also subject to research. The resulting coating properties have been analyzed in terms of oxide content, porosity and hardness as well as deposition efficiency and adhesive tensile strength. In addition, variations of the spraying angle and gas nozzle position regarding the particle properties and the deposition efficiency have been studied. These investigations were conducted for different spraying materials that are currently being used in todays industries. Additionally, in order to enhance the process performance a system to detect the cause of cold shuts has been developed. It has been discovered that so-called micro-arcs occur when the contact sleeves erode over time. |