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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

Figures

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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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