It is known that the relative performance of thermal barrier coatings is largely dependent upon the oxidation properties of the bond coat utilized in the system. Also, the oxidation properties of diffusion-type bond coats (aluminides and their modifications) are functions of the superalloy substrate used in blade applications. Therefore, the performance of a given coating system utilizing a diffusion-type bond coat can significantly vary from one superalloy to another. Toward the objective of developing coating systems with more universal applicability, it is essential to understand the mechanisms by which the superalloy substrate can influence the coating performance. In this study, we examined the relative performance of yttria-stabilized zirconia/platinum aluminide coating system on alloys CMSX-4 and MAR M 002DS representing single-crystal and directionally-solidified alloy systems respectively using thermal exposure tests at 1150 °C with a 24-h cycling period to room temperature. Changes in coating microstructure were characterized by various electron-optical techniques. Experiment showed that the coating system on alloy MAR M 002DS had outperformed that on alloy CMSX-4, which could be related to the high thermal stability of the bond coat on alloy MAR M 002DS. From a detailed microstructural characterization, this difference in behavior could be explained at least partially in terms of variation in chemical composition of the two alloys, which was also reflected on the exact failure mechanism of the coating system.
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January 2012
Research Papers
Comparative Performance of a Thermal Barrier Coating System Utilizing Platinum Aluminide Bond Coat on Alloys CMSX-4® and MAR M® 002DS
H. M. Tawancy,
H. M. Tawancy
Center for Engineering Research and Center of Research Excellence in Corrosion, Research Institute,
King Fahd University of Petroleum and Minerals
, P. O. Box 1639, Dhahran 31261, Saudi Arabia
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Luai M. Al-Hadhrami
Luai M. Al-Hadhrami
Center for Engineering Research and Center of Research Excellence in Corrosion, Research Institute,
King Fahd University of Petroleum and Minerals
, P. O. Box 1639, Dhahran 31261, Saudi Arabia
Search for other works by this author on:
H. M. Tawancy
Center for Engineering Research and Center of Research Excellence in Corrosion, Research Institute,
King Fahd University of Petroleum and Minerals
, P. O. Box 1639, Dhahran 31261, Saudi Arabia
Luai M. Al-Hadhrami
Center for Engineering Research and Center of Research Excellence in Corrosion, Research Institute,
King Fahd University of Petroleum and Minerals
, P. O. Box 1639, Dhahran 31261, Saudi Arabia
J. Eng. Gas Turbines Power. Jan 2012, 134(1): 012101 (8 pages)
Published Online: October 28, 2011
Article history
Received:
April 11, 2011
Revised:
April 12, 2011
Online:
October 28, 2011
Published:
October 28, 2011
Citation
Tawancy, H. M., and Al-Hadhrami, L. M. (October 28, 2011). "Comparative Performance of a Thermal Barrier Coating System Utilizing Platinum Aluminide Bond Coat on Alloys CMSX-4® and MAR M® 002DS." ASME. J. Eng. Gas Turbines Power. January 2012; 134(1): 012101. https://doi.org/10.1115/1.4004131
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