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Delamination toughness of electron beam physical vapor deposition (EB-PVD) Y2O3–ZrO2 thermal barrier coatings by the pushout method: Effect of thermal cycling temperature

  • M. Tanaka (a1), Y.F. Liu (a1), S.S. Kim (a2) and Y. Kagawa (a1)

Abstract

A pushout test method was used to quantify effect of thermal cycling temperatures on the delamination toughness of an electron beam physical vapor deposited thermal barrier coating (EB-PVD TBC). The delamination toughness, Γi, was related to the maximum thermal cycling temperature, Th, equal to 1000, 1025, 1050, and 1100 °C. The measured delamination toughness varied from 9 to 95 J/m2. At Th = 1000 °C, Γi attained a maximum value, larger than that of the as-deposited sample and decreasing with increased Th. During the thermal cycling tests, the thermally grown oxide (TGO) was formed between the TBC and the bond coat deposited onto the superalloy substrate. Inside the TGO layer, mixture of Al2O3 and ZrO2 oxides was observed close to the TBC side with nearly pure Al2O3 phases close to the bond-coat side. During the pushout test, delamination occurred at the interface of the mixture and pure Al2O3 layer with an exception for Th = 1100 °C specimens where delamination also occurred at the interface between the TGO and bond-coat layers. The effect of thermal cycling temperatures on the delamination toughness is discussed in terms of the microstructural change and delamination behavior.

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Corresponding author

a)Address all correspondence to this author. e-mail: kagawa@iis.u-tokyo.ac.jp

References

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1Padture, N.P., Gell, M.Jordan, E.H.: Thermal-barrier coatings for gas-turbine engine applications. Science 296, 280 2002
2Clarke, D.R.Levi, C.G.: Materials design for the next generation thermal-barrier coatings. Annu. Rev. Mater. Res. 33, 383 2003
3Evans, A.G., Mumm, D.R., Hutchinson, J.W., Meier, G.H.Pettit, F.S.: Mechanisms controlling the durability of thermal-barrier coatings. Prog. Mater. Sci. 46, 505 2001
4Mumm, D.R., Evans, A.G.Spitsberg, I.T.: Characterization of a cyclic displacement instability for a thermally grown oxide in a thermal barrier system. Acta Mater. 49, 2329 2001
5Balint, D.S.Hutchinson, J.W.: An analytical model of rumpling in thermal-barrier coatings. J. Mech. Phys. Solids 53, 949 2005
6Wen, M., Jordan, E.H.Gell, M.: Effect of temperature on rumpling and thermally grown oxide stress in an EB-PVD thermal barrier coating. Surf. Coat. Technol. 201, 3289 2006
7Mumm, D.R.Evans, A.G.: On the role of imperfections in the failure of a thermal barrier coating made by electron beam deposition. Acta Mater. 48, 1815 2000
8Mercer, C., Faulhaber, S., Yao, N., Mcllwrath, K.Fabrichnaya, O.: Investigation of the chemical composition of the thermally grown oxide layer in thermal barrier systems with NiCoCrAlY bond coats. Surf. Coat. Technol. 201, 1495 2006
9Shillington, E.A.G.Clarke, D.R.: Spalling failure of a thermal barrier coating associated with aluminum depletion in the bond-coat. Acta Mater. 47, 1297 1999
10Lee, E.Y., Biederman, R.R.Sisson, R.D.: Diffusional interactions and reactions between a partially stabilized zirconia thermal barrier coating and the NiCrAlY bond coat. Mater. Sci. Eng., A 121, 467 1989
11Sohn, Y.H., Kim, J.H., Jordan, E.H.Gell, M.: Thermal cycling of EB-PVD/MCrAlY thermal-barrier coatings: I. Microstructural development and spallation mechanisms. Surf. Coat. Technol. 146–147, 70 2001
12Vasinonta, A.Beuth, J.L.: Measurement of interfacial toughness in thermal barrier coating systems by indentation. Eng. Fract. Mech. 68, 843 2001
13Guo, S.Q., Mumm, D.R., Karlsson, A.M.Kagawa, Y.: Measurement of interfacial shear mechanical properties in thermal barrier coating systems by a barb pullout method. Scr. Mater. 53, 1043 2005
14Kim, S.S., Liu, Y.F.Kagawa, Y.: Evaluation of interfacial mechanical propertied under shear loading in EB-PVD TBCs by the pushout method. Acta Mater. 55, 3771 2007
15Liu, Y.F., Kagawa, Y.Evans, A.G.: Analysis of a “barb test” for measuring the mixed-mode delamination toughness of coatings. Acta Mater. 56, 43 2008
16Chen, X., Wang, R., Yao, N., Evans, A.G., Hutchinson, J.W.Bruce, R.W.: Foreign object damage in a thermal barrier system: Mechanisms and simulations. Mater. Sci. Eng., A 352, 221 2003
17Kagawa, Y.: Effect of thermally induced stress on fracture toughness of SiC fiber-glass matrix composites. Mater. Trans., JIM 35, 363 1995
18Liu, Y.F.Kagawa, Y.: Analysis of debonding and frictional sliding in fiber-reinforced brittle matrix composites: Basic problems. Mater. Sci. Eng., A 212, 75 1996

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