Thermal barrier coating (TBC) systems are receiving a great deal of attention as a result of their ability to enable higher operating temperatures without sacrificing component durability in gas turbine systems. Nonetheless, there are a number of unknowns associated with the failure of TBC systems. In particular, the initiation and propagation of damage has not been observed. In this paper, the microstructural changes in and along the thermally growth oxide layer of a TBC are presented. Specimens were studied primarily after isothermal exposure for 48, 96, 200, and 300 hours at 1100°C and also after thermocyclic exposure. Failure features are discussed and the growth of oxide is quantified. The oxide growth is placed within the context of a parabolic growth model. [S0094-4289(00)01503-6]
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July 2000
Technical Papers
Microstructural Features Resulting From Isothermal and Thermocyclic Exposure of a Thermal Barrier Coating
Mark E. Walter,
Mark E. Walter
The Ohio State University, 2075 Robinson Labs, Columbus, OH 43210
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Bolarinwa Onipede,
Bolarinwa Onipede
Texas A&M University, College Station, TX 77801
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Wole Soboyejo,
Wole Soboyejo
Princeton University, Princetion, NJ 08544
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Chris Mercer
Chris Mercer
Princeton University, Princetion, NJ 08544
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Mark E. Walter
The Ohio State University, 2075 Robinson Labs, Columbus, OH 43210
Bolarinwa Onipede
Texas A&M University, College Station, TX 77801
Wole Soboyejo
Princeton University, Princetion, NJ 08544
Chris Mercer
Princeton University, Princetion, NJ 08544
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division December 15, 1999; revised manuscript received March 2, 2000. Guest Editors: Raj Mohan and Rishi Raj.
J. Eng. Mater. Technol. Jul 2000, 122(3): 333-337 (5 pages)
Published Online: March 2, 2000
Article history
Received:
December 15, 1999
Revised:
March 2, 2000
Citation
Walter, M. E., Onipede, B., Soboyejo , W., and Mercer, C. (March 2, 2000). "Microstructural Features Resulting From Isothermal and Thermocyclic Exposure of a Thermal Barrier Coating ." ASME. J. Eng. Mater. Technol. July 2000; 122(3): 333–337. https://doi.org/10.1115/1.482805
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