The hot gas path section components of land based turbines require materials with superior mechanical properties and good hot corrosion and oxidation resistance. These components are generally coated with either a diffusion coating (aluminide or platinum aluminide) or with an overlay coating (MCrAlY) to provide additional hot corrosion and/or oxidation protection. These coatings degrade due to inward and outward diffusion of elements during service. Outward diffusion of aluminum results in formation of a protective oxide layer on the surface. When the protective oxide spalls, Aluminum in the coating diffuses out to reform the oxide layer. Accelerated oxidation and failure of coating occur when the Al content in the coating is insufficient to reform a continuous alumina film. This paper describes development of a coating life predictions model that accounts for both oxidation and oxide spallation under thermal mechanical loading as well as diffusion of elements that dictate the end of useful life. Cyclic oxidation data for aluminide and platinum aluminide coatings were generated to determine model constants. Applications of this model for predicting cyclic oxidation life of coated materials are demonstrated. Work is underway to develop additional material data and to qualify the model for determining actual blade and vane coating refurbishment intervals.
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July 1998
Research Papers
Coating Life Prediction Under Cyclic Oxidation Conditions
K. S. Chan,
K. S. Chan
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
e-mail: kchan@swri.org
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N. S. Cheruvu,
N. S. Cheruvu
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
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G. R. Leverant
G. R. Leverant
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
Search for other works by this author on:
K. S. Chan
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
e-mail: kchan@swri.org
N. S. Cheruvu
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
G. R. Leverant
EPRI Materials Center for Combustion Turbines, Southwest Research Institute, 6220 Culebra Road, P. O. Drawer 28510, San Antonio, TX 78228-0510
J. Eng. Gas Turbines Power. Jul 1998, 120(3): 609-614 (6 pages)
Published Online: July 1, 1998
Article history
Received:
March 15, 1997
Online:
November 19, 2007
Citation
Chan, K. S., Cheruvu, N. S., and Leverant, G. R. (July 1, 1998). "Coating Life Prediction Under Cyclic Oxidation Conditions." ASME. J. Eng. Gas Turbines Power. July 1998; 120(3): 609–614. https://doi.org/10.1115/1.2818189
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