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3674 |
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Process control of thermal spraying processes by means of acoustic emission analysis |
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Reiner Zielke* / Lehrstuhl für Werkstofftechnologie
Technische Universität Dortmund
, Deutschland Wolfgang Tillmann/ TU Dortmund, Lehrstuhl für Werkstofftechnologie, Deutschland Guang Wang/ TU Dortmund, Lehrstuhl für Werkstofftechnologie, Deutschland Mohamed Abdulgader/ TU Dortmund, Lehrstuhl für Werkstofftechnologie, Deutschland |
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The online process control of thermal spraying processes is a relevant factor for the continuous production of high quality coatings. For this purpose, different systems for process monitoring like optical systems are used. Another method used for process control is the analysis of the acoustic emission during the spraying process and the cooling-off time of the component. This enables a monitoring of the process parameters, an estimation of the coating thickness, and the detection and localization of cooling-off cracks. In this work, the experimental setup for the process monitoring by means of acoustic emission analysis is shown. The sensors were mounted on the component and on the spraying nozzle in order to obtain more information about the process. Measurements on different spraying systems with defined process parameters were conducted and analyzed in order to correlate the acoustic emission signals with the spraying parameters. The coating thickness can be measured by analyzing the emission signals. After the spraying process, cracks that formed during the cooling-off time were detected. Hence, this system shows an interesting alternative for the process control of thermal spraying processes. |