Abstract
Thermal barrier coatings (TBC) are deposited on superalloys in gas turbines to prolong component life. Electro-discharge machining (EDM) provides a convenient way of machining superalloys prior to coating deposition. Wire-EDM may leave residues from the wire material on the cut surface. A study was performed to investigate if brass residues from the EDM wire affected TBC oxidation behavior and spallation life. Isothermal oxidation at 1050 °C and thermal cycling at 1100 °C were performed on plasma sprayed TBCs on two different EDM cut substrates. No decrease in TBC life was detected due to the brass residues on the cut surfaces.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
Reference
X. Zhao and P. Xiao, “Thermal Barrier Coatings on Nickel Superalloy Substrates,” Mater. Sci. Forum, 606 (2009), 1–26.
G.W. Goward, “Protective Coatings — Purpose, Role, and Design,” Mater. Sci. Technol, 2 (1986), 194–200.
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,” Mater. Corros, 59 (7) (2008), 547–555.
Y. Yamazaki, S. Kuga, and M. Jayaprakash, “Interfacial Strength Evaluation Technique for Thermal Barrier Coated Components by Using Indentation Method,” Procedia Eng, 10 (2011), 845–850.
H. Echsler, V. Shemet, M. Schütze, L. Singheiser, and W.J. Quadakkers, “Cracking in and around the Thermally Grown Oxide in Thermal Barrier Coatings: A Comparison of Isothermal and Cyclic Oxidation,” J. Mater. Sci, 41 (2006), 1047–1058.
M. Gell, E. Jordan, K. Vaidyanathan, K. McCarron, B. Barber, Y. Sohn, and V.K. Tolpygo, “Bond Strength, Bond Stress and Spallation Mechanisms of Thermal Barrier Coatings,” Surf. Coatings Technol, 120–121 (1999), 53–60.
T.R. Newton, S.N. Melkote, T.R. Watkins, R.M. Trejo, and L. Reister, “Investigation of the Effect of Process Parameters on the Formation and Characteristics of Recast Layer in Wire-EDM of Inconel 718,” Mater. Sci. Eng. A, 513–514 (2009), 208–215.
W.J. Tomlinson and J.R. Adkin, “Microstructure and Properties of Electrodischarge Machined Surfaces,” Surf. Eng, 8 (4) (1992), 283–288.
J. Palmers, M. Van Stappen, J. D’Haen, M. D’Olieslaeger, L.M. Stals, G. Uhlig, M. Foller, and E. Haberling, “Influence o f the Presence of White Layers Formed During Grinding and Wire-Electro-Discharge Machining on PVD TiN Coating Adhesion,” Surf. Coatings Technol, 74–75 (1995), 162–167.
B. Casas, U. Wiklund, S. Hogmark, and L. Llanes, “Adhesion and Abrasive Wear Resistance of TiN Deposited on Electrical Discharge Machined WC–Co Cemented Carbides,” Wear, 265 (2008), 490–496.
R.T. Wu, K. Kawagishi, H. Harada, and R.C. Reed, “The Retention of Thermal Barrier Coating Systems on Single-Crystal Superalloys: Effects of Substrate Composition,” Acta Mater, 56 (2008), 3622–3629.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2014 TMS
About this paper
Cite this paper
Eriksson, R., Peng, R.L., Li, XH., Johansson, S. (2014). Influence of Cu and Zn Residues from Wire Electro-Discharge Machining on TBC Durability. In: Energy Materials 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-48765-6_45
Download citation
DOI: https://doi.org/10.1007/978-3-319-48765-6_45
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48598-0
Online ISBN: 978-3-319-48765-6
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)