Abstract
In this study, a disk-shaped thermal barrier coating system for a gas turbine blade was isothermally aged at 1100°C for various times up to 800 h. The microstructures of the bond coat were observed by using an optical microscope for each aging condition. Diffusion of primary elements consisting of the bond coat was characterized by using electron probe microanalyzer mapping. Semi-quantitative analysis by using scanning electron microscopy energy-dispersive X-ray was insufficient to sense variations in the Al content within the bond coat according to exposure time. An area fraction of β-NiAl phases within the bond coat was calculated by image analysis, and a reasonable approach to estimate time for complete depletion of the Al-rich β-NiAl phase within the bond coat was suggested.
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References
A. G. Evans, D. R. Mumm, J. W. Hutchinson, G. H. Meier and F. S. Pettit, Mechanisms controlling the durability of thermal barrier coatings, Progress in Materials Science, 46(5) (2001) 505–553.
M. Martena, D. Botto, P. Fino, S. Sabbadini, M. M. Gola and C. Badini, Modelling of TBC system failure: stress distribution as a function of TGO thickness and thermal expansion mismatch, Engineering Failure Analysis, 13 (2006) 409–426.
J. Toscano, R. Vaßen, A. Gil, M. Subanovic, D. Naumenko, L. Singheiser and W. J. Quadakkers, Parameters affecting TGO growth and adherence on MCrAlY-bond coats for TBC’s, Surface & Coatings Technology, 201 (2006) 3906–3910.
W. J. Quadakkers, V. Shemet, D. Sebold, R. Anton, E. Wessel and L. Singheiser, Oxidation characteristics of a platinized MCrAlY bond coat for TBC systems during cyclic oxidation at 1000°C, Surface & Coatings Technology, 199(1) (2005) 77–82.
J. R. Nicholls, in Life assessment of hot section gas turbine components: Proceedings of a conference held at heriot watt university, 5–7 October, Edited by: R. Townsend, M. Winstone, M. Henderson, J.R. Nicholls, A. Partridge, B. Nath, M. Wood and R. Viswanathan, Cambridge University Press, UK (1999) 139.
H. Echsler, D. Renusch and M. Schütze, Bond coat oxidation and its significance for life expectancy of thermal barrier coating systems, Materials Science and Technology, 20(3) (2004) 307–318.
European Patent, EP1254967A1, Improved plasma sprayed thermal bond coat system, Nov. 6 (2002).
US Patent, No. 6896488, Bond coat process for thermal barrier coating, May 24 (2005).
J. P. Henderkott, Mechanisms associated with rumpling of Pt-modified β-NiAl coatings, Master’s Thesis, Iowa State University (2007) 4.
G. Veloso, H. R. Alves and J. R. T. Branco, Effects of isothermal treatment on microstructure and scratch test behavior of plasma sprayed zirconia coatings, Materials Research, 7(1) (2004) 196.
E. Perez, T. Patterson and Y. Sohn, Interdiffusion analysis for NiAl versus superalloys diffusion couples, Journal of Phase Equilibria and Diffusion, 27(6) (2006) 659–664.
US Patent, No. 6047539, Method of protecting gas turbine combustor components against water erosion and hot corrosion, Apr. 11 (2000).
T. Ginter and T. Bouvay, Uprate options for the MS7001 heavy duty gas turbine, GER-3808C, GE Energy (2006) 9.
D. J. Kim, D. H. Lee, J. M. Koo, S. J. Song, C. S. Seok and M. Y. Kim, Evaluation of bond strength of isothermally aged plasma sprayed thermal barrier coating, Transactions of the Korean Society of Mechanical Engineers A, 32(7) (2008) 569–575.
K. J. Hemker, B. G. Mendis and C. Eberl, Characterizing the microstructure and mechanical behavior of a two-phase NiCoCrAlY bond coat for thermal barrier systems, Materials Science and Engineering A, 483–484 (2008) 727–730.
A. Gil, V. Shemet, R. Vassen, M. Subanovic, J. Toscano, D. Naumenko, L. Singheiser and W. J. Quadakkers, Effect of surface condition on the oxidation behaviour of MCrAlY coatings, Surface & Coatings Technology, 201(7) (2006) 3824–3828.
T. A. Taylor and P. N. Walsh, Thermal expansion of MCrAlY alloys, Surface & Coatings Technology, 177–178(30) (2004) 24–31.
D. J. Kim, S. K. Cho, J. H. Choi, J. M. Koo, C. S. Seok and M. Y. Kim, Evaluation of the degradation of plasma sprayed thermal barrier coatings using nano-indentation, Journal of Nanoscience and Nanotechnology, 9(12) (2009) 7272.
D. Renusch, M. Schorr and M. Schütze, The role that bond coat depletion of aluminum has on the lifetime of APS-TBC under oxidizing conditions, Materials and Corrosion, 59(7) (2008) 547–555.
D. J. Kim, I. H. Shin, J. M. Koo, C. S. Seok and M. Y. Kim, Evaluation on the delamination life of isothermally aged plasma sprayed thermal barrier coating, Transactions of the Korean Society of Mechanical Engineers A, 33(2) (2009) 162–168.
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Recommended by Associate Editor Jai Hak Park
Daejin Kim received his Ph.D. in Materials and Solid Mechanics Engineering from Sungkyunkwan University in 2009. He is currently an associate professor in the Department of Mechanical Engineering at Andong National University and is managing his Machinery and Materials Characterization Lab.
Changsung Seok received his Ph.D. in Fracture Mechanics from Sungkyunkwan University in 1990. He is currently a professor in the School of Mechanical Engineering at Sungkyunkwan University since 1997 and is managing his Integrity Evaluation Lab.
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Kim, D., Shin, I., Koo, J. et al. Quantitative analysis on the depletion rate of β-NiAl phases in MCrAlY coating. J Mech Sci Technol 28, 513–519 (2014). https://doi.org/10.1007/s12206-013-1118-3
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DOI: https://doi.org/10.1007/s12206-013-1118-3