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Assessment of Cyclic Lifetime of NiCoCrAlY/ZrO2-Based EB-PVD TBC Systems via Reactive Element Enrichment in the Mixed Zone of the TGO Scale

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Abstract

The chemical composition of the alumina-zirconia mixed zone (MZ) of an electron beam physical vapor deposited thermal barrier coating (EB-PVD TBC) system is affected by service conditions and by the interdiffusion of elements from the substrate alloy below and the zirconia top coat. Three NiCoCrAlY bond-coated Ni-base substrates with YPSZ or CeSZ EB-PVD TBCs were subjected to a cyclic furnace oxidation test (FCT) at 1373 K (1100 °C) in order to provide experimental evidence of a link between chemistry of the MZ, the substrate alloy, the ceramic top coat, and the time in the FCT. Energy dispersive spectroscopy of the MZ revealed preferred accumulation of Cr, Zr, Y, and Ce. The concentration of the reactive elements (RE = Ce + Y + Zr) was related to the respective average lifetimes of the TBC systems at 1373 K (1100 °C). The RE content in the MZ turned out to be a life-limiting parameter for YPSZ and CeSZ TBC systems which can be utilized to predict their relative lifetimes on the individual substrates. Conversely, the TBC failure mechanisms of YPSZ and CeSZ TBC systems are dissimilar.

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Acknowledgments

The authors would like to thank their colleagues Claus Kröder, Jörg Brien, and Helmut Mangers for competent processing of the EB-PVD coatings.

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Authors and Affiliations

  1. Institute of Materials Research, DLR German Aerospace Center, 51170, Cologne, Germany

    Klaus Fritscher (Retired), Wolfgang Braue (Senior Scientist) & Uwe Schulz (Senior Scientist and Department Head Coatings)

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  1. Klaus Fritscher
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  2. Wolfgang Braue
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  3. Uwe Schulz
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Correspondence to Klaus Fritscher.

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Manuscript submitted February 15, 2012.

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Fritscher, K., Braue, W. & Schulz, U. Assessment of Cyclic Lifetime of NiCoCrAlY/ZrO2-Based EB-PVD TBC Systems via Reactive Element Enrichment in the Mixed Zone of the TGO Scale. Metall Mater Trans A 44, 2070–2082 (2013). https://doi.org/10.1007/s11661-012-1561-2

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