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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal B2.1 11:25 AM
HVOF & Flame Spraying 1
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| Title: |
Influence of handling parameters on coating characteristics in order to produce near-net-shape wear resistant coatings
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| Authors: |
Benjamin Krebs* / Institute of Materials Engineering
Faculty of Mechanical Engineering
Technical University of Dortmund, Germany
Wolfgang Tillmann / TU Dortmund, Institute of Materials Engineering, Germany
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| Abstract: |
The thermal spray technology is traditionally used to coat large even or rotationally symmetric components by traversing the spray gun meandrically over the components surface. For this purpose, typically a linear unit and if necessary a turning lathe are employed. Nowadays the range of thermally sprayed products is extended and includes geometrically complex products like turbine blades, casting machine parts and various engineering tools. In order to spray near-net-shape coatings on these components, industrial robots and adapted path strategies are required. The most frequent approach to produce coatings with a uniform coating thickness and quality on complex surfaces is the optimization of the coatings in successive loops. However, this procedure is very time-consuming and cost-intensive and thus no longer contemporary or appropriate. Therefore a systematical approach with the objective to produce uniform coatings on arbitrary components is required.
The present study investigates the influence of spray torch handling parameters such as the spray angle, spray distance, track offset and gun velocity on the thickness and quality of thermally sprayed tungsten carbide MMC coatings. Distinct changes in the coatings microstructure were observed and an empirical model could be determined to describe the coating deposition. Based on these results, it was possible to spray a complex-shaped forming tool with a near-net-shape coating.
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