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DS: Fachverband Dünne Schichten
DS 15: Poster Session
DS 15.39: Poster
Dienstag, 27. März 2007, 15:00–17:00, Poster B
FEM Simulation of the Laser Plasma Interaction during Laser Nitriding — •Daniel Höche1, Gerd Rapin2, and Peter Schaaf1 — 1Universität Göttingen, II. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Universität Göttingen, Institut für Numerische und Angewandte Mathematik, Lotzestrasse 16-18, 37083 Göttingen, Germany
Laser nitriding of materials is based on the interaction of short pulsed laser radiation with the treated material and the resulting laser plasma [1]. The process is very promising for the formation of surface coatings with superior properties. Due to the short interaction times and the thin surface films an experimental observation of the underlaying processes is very difficult. In order to access the basic mechanism, FEM simulations of laser heating, evaporation, plasma formation and expansion, plasma composition and interaction with the materials surface have been performed. As a result, evaporation and expansion velocities, pressure balances and dissociation degrees have been derived. The results give a better insight into the physical processes and dependencies of the coating formation. In addition, the adsorption of nitrogen into the surface can be described as a function of process parameters. This finally allows an optimization of the coating formation. The numerical results are compared with experimental results obtained by FEL laser nitriding of titanium in nitrogen atmosphere [2].
[1] P. Schaaf. Progress in Materials Science 42 (2002) 1-161.
[2] D. Höche, M. Shinn, G. Rapin, E. Carpene, P. Schaaf. J. of Physics D: Applied Physics (2006) in print.