Cyclic Oxidation Behavior of Aluminide, Platinum Modified Aluminide, and MCrAlY Coatings on GTD-111
Author:
Cheruvu N. S.1, Chan K. S.1, Leverant G. R.1
Affiliation:
1. Electric Power Research Institute, Materials Center for Combustion Turbines at Southwest Research Institute, 6220 Culebra, San Antonio, TX 78238-5166
Abstract
Cyclic oxidation behavior of aluminide, platinum modified aluminide, and MCrAlY coatings has been investigated at three temperatures. Aluminide and platinum modified coatings were deposited on GTD 111 material using an outward diffusion process. CoCrAlY coating was applied on GTD-111 by Electron Beam Physical Vapor Deposition (EB-PVD). The oxidation behavior of these coatings is characterized by weight change measurements and by the variation of β phase present in the coating. The platinum modified aluminide coating exhibited the highest resistance to oxide scale spallation (weight loss) during cyclic oxidation testing. Metallographic techniques were used to determine the amount of β phase and the aluminum content in a coating as a function of cycles. Cyclic oxidation life of these coatings is discussed in terms of the residual β and aluminum content present in the coating after exposure. These results have been used to calibrate and validate a coating life model (COATLIFE) developed at the Material Center for Combustion Turbines (MCCT). [S0742-4795(00)00801-2]
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference9 articles.
1. Chan, K. S., Cheruvu, N. S., and Leverant, G. R., 1997, “Coating Life Prediction Under Cyclic Oxidation Conditions,” ASME Paper 97-GT-389. 2. Embley, G. T., and Kallianpur, V. V., 1985, “Long-Term Creep Response of Gas Turbine Bucket Alloys,” Proceedings, Life Prediction of High Temperature Gas Turbine Materials, August 27–30, Syracuse University, New York, V. Weiss, and W. T. Baker, eds., pp. 5–1. 3. Shankar, S., 1985, “Methods of Forming Protective Diffusion Layer on Nickel, Cobalt, and Iron Based Alloys,” U.S. Patent No. 4,525,814. 4. Smith, J. S., and Boone, D. H., 1990, “Platinum Modified Aluminide-Present Status, ASME Paper 90-GT-319.” 5. Cheruvu, N. S., and Leverant, G. R., 1998, “Influence of Metal Temperature on Base Material and Coating Degradation of GTD-111 Buckets,” presented at the 1998 ASME Int’l. Gas Turbine and Aero Engine Congress and Exhibition, Stockholm, Sweden.
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