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

•CoNiCrAlY and ZrO2+Y2O3 powders were deposited on Inconel 718 superalloy using APS method.•Bond coats were shot peened to obtain a denser coating structure and lower porosity.•Oxidation tests were carried out on the samples at 1000°C in a time-dependent manner.•An increase in the oxidation resistan...

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Bibliographic Details
Published in:Applied surface science 2015-11, Vol.354, p.314-322
Main Authors: Karaoglanli, Abdullah Cahit, Doleker, Kadir Mert, Demirel, Bilal, Turk, Ahmet, Varol, Remzi
Format: Article
Language:English
Subjects:
Atmospheric plasma spraying (APS)
Atmospherics
Bonding
Coating
CoNiCrAlY
Isothermal oxidation
Oxidation
Oxidation resistance
Shot peening
Thermal barrier coating (TBC)
Thermal barrier coatings
Yttria stabilized zirconia
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Summary:•CoNiCrAlY and ZrO2+Y2O3 powders were deposited on Inconel 718 superalloy using APS method.•Bond coats were shot peened to obtain a denser coating structure and lower porosity.•Oxidation tests were carried out on the samples at 1000°C in a time-dependent manner.•An increase in the oxidation resistance of shot-peened coatings was observed. A conventional thermal barrier coating (TBC) system is made up of a multilayered coating system that comprises a metallic bond coat including oxidation-resistant MCrAlY and a thermally insulating ceramic top coat including yttria stabilized zirconia (YSZ). In this study, in order to improve the oxidation behavior in conventionally produced TBC systems, shot peening process is applied for modification of surface layer structure of atmospheric plasma spray (APS) bond coats. The oxidation behavior of TBCs, produced by the APS process and subjected to shot peening, was investigated. Oxidation tests were performed under isothermal conditions at 1000°C for different time periods. The coatings produced by the APS process include high porosity and oxide content due to atmospheric production conditions as well as exposure to very high temperature. In this study, the coatings, produced by the APS process, subsequently subjected to shot-peening, were compared with the ones which were not shot peened. Following the application of the shot peening process, a dense structure is obtained due to the plastic deformation effect in the metallic bond coating structure at a certain distance from the surface. To this end, the effects of the shot-peening on the high temperature oxidation behavior of the coatings are investigated and evaluated.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.06.113