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| Abstract No.: |
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Scheduled at:
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Tuesday, June 03, 2008, Room 04 3:00 PM
New Equipment 3
Latest developments in thermal spray equipment, modern multiple arc plasma guns, optimized powder feeder, new vacuum processes
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| Title: |
Detailed analysis of the plasma jet of F4 and delta torches by means of tomography
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| Authors: |
Felix Dschung* / Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich, Germany
Günter Forster / Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich, Germany
Jochen Schein/ Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich, Germany
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| Abstract: |
One important aspect concerning the coating of surfaces using thermal spraying is the improvement of the injection of material particles into the gas jet and thus the deposition efficiency. Therefore a better knowledge of the temperature distribution within the jet is relevant in order to optimize the spraying conditions. Particularly interesting is the existence of a well-defined threefold finger structure in the plasma jet produced by new triple electrode torches, which allows the efficient injection of coating material due to the existence of zones with higher and lower viscosity. The jet structure, however, lacks rotational symmetry and can therefore not be analyzed by systems relying on the validity of the Abel inversion, thus new systems have to be developed. In this work an innovative tomography device is described that has been designed for this purpose. By circling half around the plasma jet and taking simultaneously intensity images under different view orientations, a three-dimensional intensity distribution of the jet is generated, which can be used to determine the temperature distribution.
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