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6576 |
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Comparison of different particle diagnostic systems widely used in monitoring of thermal spraying processes |
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Stephan Zimmermann* / University of the Federal Armed Forces Munich, Germany Roman Forster / University of Federal Armed Forces Munich IPM (LPT), Germany Jochen Schein/ University of Federal Armed Forces Munich IPM (LPT), Germany Wolfgang Tillmann/ TU Dortmund University, Institute of Materials Engineering (LWT), Germany Christopher Schaak/ TU Dortmund University, Institute of Materials Engineering (LWT), Germany Leif Hagen/ TU Dortmund University, Institute of Materials Engineering (LWT), Germany Hans-Georg Rademacher/ TU Dortmund University, Institute of Materials Engineering (LWT), Germany |
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In thermal spraying, the particle temperature Tp and the particle velocity vp are the determining factors that control the resulting coating properties directly. Therefore, these in-flight particle characteristics are considered as monitoring quantities that require adequate diagnostic systems to measure. These systems should possess a high accuracy and reproducibility to ensure high reliability on the obtained measurements. The question, deliver all in market well established diagnostic systems comparable measurements, remains unanswered. In this study, the spray particle conditions for conventional thermal spray processes such as atmospheric plasma spraying (APS), twin wire arc spraying (TWAS), and high velocity oxy-fuel (HVOF) spraying were examined using various diagnostic systems. The operating principle and evaluating algorithms in each of these systems are different, nevertheless they should deliver comparable reading for the same adjusted parameters. In this study, first correlation factors were defined, enabling an improved comparability of the physical data of spray particles, i.e. uniform standard for particle velocity and particle temperature measurements. Moreover, this study gives an outlook on future diagnostic investigations in field of thermal spraying. |