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TECHNICAL PAPERS

Microstructural Features Resulting From Isothermal and Thermocyclic Exposure of a Thermal Barrier Coating

[+] Author and Article Information
Mark E. Walter

The Ohio State University, 2075 Robinson Labs, Columbus, OH 43210walter.80@osu.edu

Bolarinwa Onipede

Texas A&M University, College Station, TX 77801

Wole Soboyejo, Chris Mercer

Princeton University, Princetion, NJ 08544

J. Eng. Mater. Technol 122(3), 333-337 (Mar 02, 2000) (5 pages) doi:10.1115/1.482805 History: Received December 15, 1999; Revised March 02, 2000
Copyright © 2000 by ASME
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References

Walter,  M. E., and Eigenmann,  B., 2000, “The mechanical response of three EB-PVD zirconia thermal barrier coating microstructures,” Mater. Sci. Eng., A282, pp. 49–58.
Wright,  P. K., and Evans,  A. G., 1999, “Mechanisms governing the performance of thermal barrier coatings,” Curr. Opin. Solid State Mater. Sci., 4, pp. 255–265.
Bose,  S., and DeMasi-Marcin,  J., 1997, “Thermal barrier coating experience in gas turbine engines at Pratt & Whitney,” J. Thermal Spray Tech., 6, pp. 99–104.
Gell,  M., Vaidyanathan,  K., Barber,  B., Cheng,  J., and Jordan,  E., 1999, “Mechanism of spallation in platinum aluminide/electron beam physical vapor-deposited thermal barrier coatings,” Metall. Mater. Trans. A, 30A, pp. 427–435.
He,  M. Y., Evans,  A. G., and Hutchinson,  J. W., 1998, “Effects of morphology on the decohesion of compressed thin films,” Mater. Sci. Eng., A, 245, pp. 168–181.
Morell, P., and Rickerby, D. S., 1998, “Advantages/disadvantages of various TBC systems as perceived by the engine manufacturer,” The 85th Meeting of the AGARD Structures and Materials Panel: Thermal Barrier Coatings, R-823, Aalborg, Denmark, p. 20.
Freborg, A. M., Ferguson, B. L., Brindley, W. J., and Petrus, G. J., 1998, Bond coat considerations for thermal barrier coatings, The 85th Meeting of the AGARD Structures and Materials Panel: Thermal Barrier Coatings, R-823, Aalborg, Denmark, p. 17.
Chaudhury,  Z. A., Newaz,  G. M., Nusier,  S. Q., and Ahmed,  T., 1997, “Interfacial damage in EB-PVD thermal barrier coatings due to thermal cycling,” Mater. Sci. Eng., A, A231, pp. 34–41.
Newaz,  G. M., Nusier,  S. Q., and Chaudhury,  Z. A., 1998, “Damage accumulation mechanisms in thermal barrier coatings,” ASME J. Eng. Mater. Technol., 120, pp. 149–153.
Lan, J., and Walter, M. E., 1999, “Investigation of damage in EB-PVD thermal barrier coating during thermocyclic loading,” Proceedings of the 1999 SEM Spring Conference, Brookfield, CT.

Figures

Grahic Jump Location
A cross-sectional view of a TBC structure
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A schematic of the experimental apparatus used for thermocyclic loading
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A typical defect in the columnar ZrO2 microstructure as seen in an untested TBC specimen
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A cross-sectional view of a specimen isothermally exposed for 96 hours
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A cross-sectional view of a specimen isothermally exposed for 200 hours
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A micrograph showing a ZrO2 peg which was pulled out of the top coat during interface separation in the specimen exposed for 200 hours
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A view of the PtAl substrate (right) and remaining TGO (left) after the top coat was detached from the 300 hour specimen
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The underside of the top coat with remaining TGO island after separation from the substrate of the 300 hour specimen
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The “footprints” in the PtAl bond coat viewed after the top coat was removed from the 300 hour specimen
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A plot of experimentally measured TGO thicknesses for three isothermal hold times together with parabolic growth curves
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A micrograph showing the separated TGO layer between the top coat and bond coat in the thermocyclically loaded specimen
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A micrograph showing the wavy TGO layer in the thermocyclically loaded specimen

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