Effects of Shot Peening Process on Thermal Cycling Lifetime of TBCs Prepared by EB-PVD

Effect of shot peening on the oxidation behavior of thermal barrier coatings

“…After the porosity measurements, removal of the pores along with the dense layer forming on the surface of the upper coating, enabled the reduction of TGO thickness forming as a result of oxidation. Removal of excessive protrusions, roughness, and discontinuous oxide growth in NiCrAlY bond coats, through application of shot peening process, have been reported in the literature [10,30,33]. The surface roughness, occurring after the bond coat production, is also removed with shot-peening process in the present study.…”

“…A certain level of surface roughness is desired in the production of coating. A number of studies are available in the literature regarding the effect of surface roughness on TBC formation [10,[28][29][30][31][32][33][34]. According to literature, surface treatments like shot peening, grit blasting and polishing are used to decrease surface roughness for TBC systems.…”