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Bond Coat Engineering Influence on the Evolution of the Microstructure, Bond Strength, and Failure of TBCs Subjected to Thermal Cycling


Different types of thermal spray systems, including HVOF (JP5000 and DJ2600-hybrid), APS (F4-MB and Axial III), and LPPS (Oerlikon Metco system) were employed to spray CoNiCrAlY bond coats (BCs) onto Inconel 625 substrates. The chemical composition of the BC powder was the same in all cases; however, the particle size distribution of the powder employed with each torch was that specifically recommended for the torch. For optimization purposes, these BCs were screened based on initial evaluations of roughness, porosity, residual stress, relative oxidation, and isothermal TGO growth. A single type of standard YSZ top coat was deposited via APS (F4MB) on all the optimized BCs. The TBCs were thermally cycled by employing a furnace cycle test (FCT) (1080 °C-1 h—followed by forced air cooling). Samples were submitted to 10, 100, 400, and 1400 cycles as well as being cycled to failure. The behavior of the microstructures, bond strength values (ASTM 633), and the TGO evolution of these TBCs, were investigated for the as-sprayed and thermally cycled samples. During FCT, the TBCs found to be both the best and poorest performing and had their BCs deposited via HVOF. The results showed that engineering low-oxidized BCs does not necessarily lead to an optimal TBC performance. Moreover, the bond strength values decrease significantly only when the TBC is about to fail (top coat spall off) and the as-sprayed bond strength values cannot be used as an indicator of TBC performance.

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  1. D.J. Wortman, B.A. Nagaraj, and E.C. Duderstadt, Thermal Barrier Coatings for Gas Turbine Use, Mater. Sci. Eng. A, 1989, 121, p 433-440

    Article  Google Scholar 

  2. C.U. Hardwicke and Y.-C. Lau, Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review, J. Thermal Spray Technol., 2013, 22(5), p 564-576

    Article  Google Scholar 

  3. A.R. Nicoll and G. Wahl, The Effect of Alloying Additions on M-Cr-Al-Y Systems—An Experimental Study, Thin Solid Films, 1982, 95, p 21-34

    Article  Google Scholar 

  4. M. Di Ferdinando, A. Fossati, A. Lavacchi, U. Bardi, F. Borgioli, C. Borri, C. Giolli, and A. Scrivani, Surf. Coat. Technol., 2010, 204, p 2499-2503

    Article  Google Scholar 

  5. M. Shibata, S. Kuroda, H. Murakami, M. Ode, M. Watanabe, and Y. Sakamoto, Mater. Trans., 2006, 47(7), p 1638-1642

    Article  Google Scholar 

  6. A. Fossati, M. Di Fernando, A. Lavacchi, A. Scrivani, C. Giolli, and U. Bardi, Improvement of the Oxidation Resistance of CoNiCrAlY Bond Coats Sprayed by High Velocity Oxygen-Fuel onto Nickel Superalloy Substrate, Coatings, 2011, 1, p 3-16. doi:10.3390/coatings1010003

    Article  Google Scholar 

  7. W.R. Chen, X. Wu, B.R. Marple, D. Nagy, and P.C. Patnaik, TGO Growth Behaviour in TBCs with APS and HVOF Bond Coats, Surf. Coat. Technol., 2008, 202, p 2677-2683

    Article  Google Scholar 

  8. A. Rabiei and A.G. Evans, Failure Mechanisms Associated with the Thermally Grown Oxide in Plasma-Sprayed Thermal Barrier Coatings, Acta Mater., 2000, 48, p 3963-3976

    Article  Google Scholar 

  9. P.K. Wright and A.G. Evans, Mechanisms Governing the Performance of Thermal Barrier Coatings, Curr. Opin. Solid State Mater. Sci., 1999, 4, p 255-265

    Article  Google Scholar 

  10. J.A. Haynes, M.K. Ferber, and W.D. Porter, Thermal Cycling Behavior of Plasma-Sprayed Thermal Barrier Coatings with Various MCrAlX Bond Coats, J. Thermal Spray Technol., 2000, 9(1), p 38-48

    Article  Google Scholar 

  11. T. Patterson, A. Leon, B. Jayaraj, J. Liu, and Y.H. Sohn, Thermal Cyclic Lifetime and Oxidation Behavior of Air Plasma Sprayed CoNiCrAlY Bond Coats for Thermal Barrier Coatings, Surf. Coat. Technol., 2008, 203, p 437-441

    Article  Google Scholar 

  12. S. Saeidi, K.T. Voisey, and D.G. McCartney, Mechanical Properties and Microstructure of VPS and HVOF CoNiCrAlY Coatings, J. Thermal Spray Technol., 2011, 20(6), p 1231-1243

    Article  Google Scholar 

  13. A. Schmidt, H. Aleksanoglu, T. Mao, A. Scholz, and C. Berger, Influence of Bond Coat Roughness on Life Time of APS Thermal Barrier Coating Systems under Thermo-Mechanical Load, J. Solid Mech. Mater. Eng., 2010, 4(2), p 208-220

    Article  Google Scholar 

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Correspondence to R. S. Lima.

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This article is an invited paper selected from presentations at the 2014 International Thermal Spray Conference, held on May 21-23, 2014, in Barcelona, Spain, and has been expanded from the original presentation.

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Lima, R.S., Nagy, D. & Marple, B.R. Bond Coat Engineering Influence on the Evolution of the Microstructure, Bond Strength, and Failure of TBCs Subjected to Thermal Cycling. J Therm Spray Tech 24, 152–159 (2015).

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