Analytical Modeling of Unsteady Aluminum Depletion in Thermal Barrier Coatings

Authors : Bülent YEŞİLATA

Pages : 675-680

View : 21 | Download : 17

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The oxidation behavior of thermal barrier coatings insert ignore into journalissuearticles values(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