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On the Microstructure of the Initial Oxide Grown by Controlled Annealing and Oxidation on a NiCoCrAlY Bond Coating

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Abstract

Different pre-annealing and pre-oxidation treatments were conducted on a dual phase γ+β Ni–21Co–18Cr–22Al–0.2Y (at.%) bond coating for 1 hr at 1373 K (i) with or without a native oxide upon heating, (ii) in two different atmospheres upon heating, and (iii) under various oxygen partial pressures (pO2) in the range of 0.1–105 Pa during oxidation. The chemical composition, structure, morphology and phase constitution of the resulting oxide layers were investigated using a range of analytical techniques. It is found that the exclusive formation of a continuous α-Al2O3 layer without the simultaneous formation of NiAl2O4 spinel was promoted for oxidation at low pO2. The formation of metastable θ-Al2O3 was suppressed for a low fraction of the β phase, coupled with a high fraction of segregated Y at the initial bond coat surface. Initial Y segregation and incorporation of Y2O3 and Y3Al5O12 within the developing oxide layer was promoted in the absence of a native oxide and for heating in an inert atmosphere. The development of protrusions (i.e. pegs) at the oxide/coating interface, as a result of the incorporation of internal Y2O3 precipitates by the inward growing oxide layer, was most pronounced upon heating in an inert atmosphere, followed by oxidation at an intermediate pO2.

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Author notes

  1. L. P. H. Jeurgens

    Present address: Max Planck Institute for Metals Research, Heisenbergstrasse 3, D-70569, Stuttgart, Germany

Authors and Affiliations

  1. Department of Materials Science and Engineering, Delft University of Technology, Rotterdamseweg 137, 628, AL, Delft, The Netherlands

    T. J. Nijdam, L. P. H. Jeurgens & W. G. Sloof

  2. Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628, AL, Delft, The Netherlands

    J. H. Chen

Authors
  1. T. J. Nijdam
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  2. L. P. H. Jeurgens
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  3. J. H. Chen
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  4. W. G. Sloof
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Correspondence to W. G. Sloof.

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Nijdam, T.J., Jeurgens, L.P.H., Chen, J.H. et al. On the Microstructure of the Initial Oxide Grown by Controlled Annealing and Oxidation on a NiCoCrAlY Bond Coating. Oxid Met 64, 355–377 (2005). https://doi.org/10.1007/s11085-005-8532-6

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  • DOI: https://doi.org/10.1007/s11085-005-8532-6

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