- Turkish Journal of Engineering and Environmental Sciences
- Vol: 25 Issue: 6
- Analytical Modeling of Unsteady Aluminum Depletion in Thermal Barrier Coatings
Analytical Modeling of Unsteady Aluminum Depletion in Thermal Barrier Coatings
Authors : Bülent YEŞİLATA
Pages : 675-680
View : 6 | Download : 3
Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :The oxidation behavior of thermal barrier coatings (TBCs) in aircraft turbines is studied. A simple, unsteady and one-dimensional, diffusion model based on aluminum depletion from a bond-coat to form an oxide layer of Al2O3 is introduced. The model is employed for a case study with currently available experimental data. The diffusion coefficient of the depleted aluminum in the alloy, the concentration profiles at different oxidation times, and the thickness of Al-depleted region are obtained. The results suggest that potential changes in the thermo-mechanical properties of the original alloy in the Al-depleted region may be partly responsible for the mechanical failure of TBC systems.Keywords : Thermal oxidation, Thermal barrier coating, Aluminum depletion, Alumina, Diffusion coefficient.