Evaluation of the Residual Stress Evolution in Thermal Barrier Coating System Using the In Situ Curvature of a Three-Layered Specimen

Thermal barrier coatings (TBCs) are used to protect the hot sections of gas turbines and jet engines. A typical TBC system consists of a substrate, bond coat, and a TBC top coat (TC). To develop a high-performance TBC, it is essential to accurately evaluate the residual stress evolution during the t...

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Bibliographic Details
Published inJournal of thermal spray technology Vol. 30; no. 5; pp. 1183 - 1198
Main Authors Hayase, Tomoyuki, Waki, Hiroyuki, Adachi, Kanta
Format Journal Article
LanguageEnglish
Published New York Springer US 01.06.2021
Subjects
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Machines
Manufacturing
Materials Science
Peer Reviewed
Processes
Surfaces and Interfaces
Thin Films
Tribology
MCrAlY
residual stress
deposition stress
thermal stress
Yttria-stabilized zirconia (YSZ)
curvature measurement
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Summary:Thermal barrier coatings (TBCs) are used to protect the hot sections of gas turbines and jet engines. A typical TBC system consists of a substrate, bond coat, and a TBC top coat (TC). To develop a high-performance TBC, it is essential to accurately evaluate the residual stress evolution during the thermal spray process (deposition and post-deposition cooling) of TBCs. In this study, a simple analytical block model of three-layered system using the in situ curvature change caused by the misfit strain of each layer was proposed to investigate the residual stress evolution of a TBC system. In the model, the deposition stress and final residual stress were evaluated from the change in the curvature. Subsequently, the thermal stress during post-deposition cooling was indirectly evaluated by subtracting the deposition stress from the final residual stress. The accuracy of the average through-thickness stress of the deposition process, cooling process, and final state evaluated by the proposed analytical block model was verified by the finite element analysis block model and analytical progressively deposited model. Finally, the proposed model was applied to an atmospheric plasma-sprayed TBC system, and the practicability of the model was experimentally demonstrated.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-021-01221-y