Investigation of hot corrosion behavior of thermal barier coating (TBC) produced by cold gas dinamic spray (CGDS) technique

Thermal barrier coatings (TBCs) are generally used as a protective coating in gas türbine, aerospace and aircraft industry,critical region parts exposed to high temperatures, for the purpose of thermal insulation. TBCs provide protective to minimize aggressive environmental conditions such as oxidation, corrosion and thermal shock occuring at high temperatures within the structure.In this study, CoNiCrAlY metallic bond coat material was deposited with cold gas dynamic spray (CGDS) on Inconel 718 superalloy substrate material. Production of ceramic top coat, which content ZrO2+Y2O3 (YSZ), were perfomed with using atmospheric plazma spray (APS) and electron beam physical vapor deposition on the bond coats, which were produced using CGDS technique.Produced different TBC samples were subjected to hot corrosion tests under 1000 °C for 4 hours periods. Microstructural and mechanical examinations using SEM, EDS, elemental mapping, porosity, XRD analysis and hardness testing were copleted for different methods of the manufacture of TBC and observing in detail the effects of hot corrosion were tested. Obtained results are evaluated making comparisons with current literature studies.