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5223 |
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Thursday, June 08, 2017, Hall 26 4:00 PM Wear & Corrosion Protection |
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Influence of the stand-off distance and spray angle on the coating formation and properties during three-cathode plasma spraying |
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Lidong Zhao* / RWTH Aachen University, Germany Kirsten Bobzin / Surface Engineering Institute, RWTH Aachen University, Germany Mehmet Öte/ Surface Engineering Institute, RWTH Aachen University, Germany Tim Königstein/ Surface Engineering Institute, RWTH Aachen University, Germany Matthias Oechsner/ Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA), Chair and Institute for Materials Technology (IfW), TU Darmstadt, Germany Marius Siebers/ Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA), Chair and Institute for Materials Technology (IfW), TU Darmstadt, Germany Georg Andersohn/ Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA), Chair and Institute for Materials Technology (IfW), TU Darmstadt, Jörg Ellermeier/ Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA), Chair and Institute for Materials Technology (IfW), TU Darmstadt, Germany |
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Three-cathode plasma spraying is characterized by high process robustness in terms of particle in-flight properties due to high stability of plasma jet. However, during coating parts with complex geometries, process parameters such as stand-off distance and spray angle usually cannot be kept at optimized conditions. In this study, the process robustness during three-cathode plasma spraying of a novel FeCrMnBC alloy was investigated by varying stand-off distance and spray angle to simulate spray conditions for complex geometries. A three-cathode plasma generator TriplexProTM-210 was used to spray FeCrMnBC powder with a fraction of -45 +20 µm onto substrates of cast iron EN-GJL-250. The stand-off distance and the spray angle were varied from d=100 mm to d=110 mm and between ø=90° and ø=60°, respectively, while the other process parameters were kept constant. The results revealed that the reduction of spray angle caused an about 15 % decrease of coating thickness, about 40 % porosity increase and about 15% increase of bond strength. In contrast, the variation of stand-off distance changed only insignificantly the coating thickness, porosity and bond strength. The variation of stand-off distance and spray angle did not result in significant changes in the coating microhardness. |