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1238 |
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Tuesday, June 03, 2008, Room 04 2:20 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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Large-A plasma torch for surface chemistry applications and CVD processes ? a status report |
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Stephan Zimmermann* / University of the Federal Armed Forces Munich, Germany Eckart Theophile/ Universität der Bundeswehr München, Institut EIT1 IPM(LPT), Germany Klaus Landes/ Universität der Bundeswehr München, Institut EIT1 IPM(LPT), Germany Jochen Schein/ Universität der Bundeswehr München, Institut EIT1 IPM(LPT), Germany |
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The LARGE is a new generation DC-plasma torch featuring an extended arc which is operated with a perpendicular gas flow to create a wide (up to 45 cm) plasma jet well suited for large area plasma processing. Using plasma diagnostic systems like high speed imaging, enthalpy probe, emission spectroscopy and tomography the LARGE produced plasma jet charcteristics have been measured and sources of instability have been identified. With a simple model/simulation of the system LARGE III-150 and numerous experimental results, a new nozzle configuration and geometry (LARGE IV-150) has been designed, which produces a more homogenous plasma jet. These improvements enable the standard applications of the LARGE plasma torch (CVD coating process and surface activation process) to operate with higher efficiency. *currently with Reinhausen Plasma |