Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 32: Topical Session High Temperature Materials III
MM 32.3: Vortrag
Mittwoch, 25. März 2009, 17:30–17:45, IFW A
Micro bending tests on EB-PVD YSZ thermal barrier coatings — •Carolin Pfeiffer1, Mathias Göken1, and Ernst Affeldt2 — 1Lehrstuhl Allgemeine Werkstoffeigenschaften WW I, Institut für Werkstoffwissenschaften, Universität Erlangen-Nürnberg, Martensstrasse 5, 91058 Erlangen — 2MTU Aero Engines GmbH, Dachauer Str. 665, 80995 München
Thermal barrier coatings (TBCs) are widely used for protection of turbine components from high temperatures. Since the application of thermal barrier coatings can reduce the substrate temperature by up to 200°C, the gas inlet temperature has risen accordingly and the TBCs have become critical for engine operation. The mechanical properties and the microstructural evolution during operation are essential for the estimation of remaining lifetime of the coating. However, the understanding of this subject is still not sufficient.
In order to investigate the mechanical properties of the ceramic thermal barrier, a bending test rig has been developed which is capable of testing small specimens in a four-point bending mode. The tests are monitored with a high resolution camera, which allows a non-contact determination of the sample deflection by digital image correlation.
The sample material has been heat treated at various temperatures for a range of times, in order to determine the sintering effect on the materials properties. In addition, the material is examined by compression and nanoindentation, in order to study the influence of the size of the tested volume on the values obtained.