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Shark-skin inspired surface engineering on intermetallic titanium aluminides for high temperature applications using the fluorine effect

Published online by Cambridge University Press:  15 March 2011

Raluca Pflumm  and
Michael Schütze
Raluca Pflumm
Affiliation:
Karl-Winnacker-Institut, Dechema e.V., Theodor-Heuss-Allee 25, D-60316, Frankfurt am Main, Germany
Michael Schütze
Affiliation:
Karl-Winnacker-Institut, Dechema e.V., Theodor-Heuss-Allee 25, D-60316, Frankfurt am Main, Germany
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Abstract

Increasing demands on technical components for high-temperature applications (e.g. tur-bine blades) promote new developments not only in the field of alloy design, but also in surface engineering. This paper shows that it is possible to structure the surface of intermetallic titanium aluminides in-situ by locally controlled oxidation of the material due to selective doping with fluorine. The aim is to reproduce a shark-skin pattern (parallel riblets with valleys in between) in order to improve the surface aerodynamics. Riblets with widths in the single digit μm range have been generated. The nucleation process, the aspect ratio and the stability of the generated micro-structures are discussed as a function of the substrate composition and the oxidation conditions.

Keywords

oxidationsurface reactionalloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n04-12
Copyright
Copyright © Materials Research Society 2011

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References

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