Journals / Turkish Journal of Engineering and Environmental Sciences / 2001 / Cilt: 25 - Sayı: 6
Analytical Modeling of Unsteady Aluminum Depletion in Thermal Barrier Coatings
- Pages
- 675–680
- DOI
- —
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.
Özet
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.