Forschungszentrum Jülich, Zentralbibl., Verl.
Thermomechanisches Verhalten von plasmagespritzten Schichtsystemen zur Wärmedämmung
Abstract
dc:descriptionThermal barrier coatings are increasingly utilized to protect gas turbine components from high temperature exposure. Thus the use of TBCs allows an improvement of the system efficiency, since the coated components can support higher inlet temperatures. To predict the life duration of the TBC-system, the determination of the high temperature behavior of the protective coatings in composite geometry is indispensable. In the present study, experiments were selected to evaluate the thermoelastic properties of a plasma sprayed TBC in composite geometry. The curvature behavior of three-layer specimen strips was observed between room temperature and 1000°C, when submitted exclusively to temperature. Also isothermal 4-point bending tests were performed at room temperature, 600°C and 950°C. During curvature and bending experiments, shape and structure changes were monitored in-situ using a high resolution telescope in combination with a digital data acquisition system. The high temperature experiments on the TBC-specimen strips demonstrate that the bonded materials behave elastic up to 600°C. Depending on the specimens geometry, i.e. on the stress distribution, non-elastic effects can occur above 600°C. When all layers show an elastic behavior, the stress distribution can be calculated at room and at high temperatures by using a linear-elastic model developed for this purpose. Also the temperature dependent elastic modulus of the ceramic TBC in composite geometry can be derived.
Degree
thesis:*- Grantor dc:publisher
- Forschungszentrum Jülich, Zentralbibl., Verl.
- Year dc:date
- 2000
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Blandin, Gwendoline
- Contributors dc:contributor
-
- Schubert, Florian
Subjects
dc:subject × 12Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- ger