|
2704 |
|
Thursday, September 29, 2011, Saal B2.1 2:25 PM Plasma Spraying 2 |
|
Homogenization of coating properties in atmospheric plasma spraying - results and outlook of a DFG (German Research Foundation)- Funded Research Group |
|
Jens Prehm* / Institute of Materials Science,
Leibniz Universitaet Hannover, Germany Friedrich-Wilhelm Bach / Institute of Materials Science, Leibniz University Hannover, Germany Jochen Schein/ Lab for Plasma Technology, Universitaet der Bundeswehr Muenchen, Germany Kirsten Bobzin/ Surface Engineering Institute, RWTH Aachen University, Germany Kai Möhwald/ Institute of Materials Science, Leibniz University Hannover, Germany Ivica Petkovi/ Surface Engineering Institute, RWTH Aachen University, Germany Nazlim Bagcivan/ Surface Engineering Institute, RWTH Aachen University, Germany Karsten Hartz-Behrend/ Lab for Plasma Technology, Universitaet der Bundeswehr Muenchen, Germany Klaus Landes/ Lab for Plasma Technology, Universitaet der Bundeswehr Muenchen, Germany |
|
The goal of this research group is to homogenize properties of 3-cathode plasma sprayed coatings on basis of numerical simulations and advanced diagnostics. Results of the first phase of funding as well as an outlook to future work are presented. A numerical model for a 3-cathode torch, including electro-magnetic and thermal phenomena was developed to investigate the plasma flow. Modelling results are verified by plasma diagnostics (Computer Tomography). In order to include particle shrinking effects, coating formation simulation is accomplished by a newly developed model, based on Computational Fluid Dynamics coupled with Finite Element method, whereas diagnostics is done in the fields of particle diagnostics (Particle Shape Imaging, Laser Doppler Anemometry). During the next phase of the project, an investigation of the plasma free jet and particle injection is scheduled by advanced diagnostics and simulation respectively. In a subsequent stage the transition from conventional particles to suspensions shell considered. Coating formation simulations are scaled up to dimensions of macroscopic tensile tests. By combining these overarching investigations, appropriate process parameters for homogenized coatings will be obtained. |