1 Introduction Thermal barrier coatings (TBCs), extensively employed for thermal insulation and corrosion protection within aircraft engine hot sections, comprise a metallic bond coat, and a ceramic top coat [1-5]. The bond coat critically serves two functions: adhering the ceramic layer to the metallic substrate and protecting the substrate from oxidation. This protection depends on the bond coat's ability to form a continuous and dense alumina-based thermally grown oxide (TGO) [6-8].
