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Effects of Feedstock Decomposition and Evaporation on the Composition of Suspension Plasma-Sprayed Coatings

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Abstract

Emerging new applications and growing demands of plasma-sprayed coatings have initiated the development of new plasma spray processes. One of them is suspension plasma spraying (SPS). The use of liquid feedstock such as suspensions yields higher flexibility compared to the conventional atmospheric plasma spray processes as even submicron-to nano-sized particles can be processed. This allows achieving particular microstructural features, e.g., porous segmented or columnar-structured thermal barrier coatings. To exploit the potentials of such novel plasma spray processes, the plasma-feedstock interaction must be understood better. In this study, decomposition and evaporation of feedstock material during SPS were investigated, since particular difficulties can occur with respect to stoichiometry and phase composition of the deposits. Plasma conditions were analyzed by optical emission spectroscopy (OES). Experimental results are given, namely for gadolinium zirconate and for lanthanum strontium cobalt ferrite deposition. Moreover, the applied OES approach is validated by comparison with the simpler actinometry method.

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Acknowledgments

The authors gratefully acknowledge the SEM work by Dr. Doris Sebold and the XRD analyses by Dr. Yoo Jung Sohn, both Forschungszentrum Jülich, IEK-1. The chemical analyses were performed by Forschungszentrum Jülich, ZEA-3.

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Authors and Affiliations

  1. Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung (IEK-1), 52425, Jülich, Germany

    G. Mauer, N. Schlegel, A. Guignard, R. Vaßen & O. Guillon

  2. Left to tsd Technik-Sprachendienst GmbH, 50672, Cologne, Germany

    A. Guignard

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  1. G. Mauer
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  2. N. Schlegel
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  3. A. Guignard
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  4. R. Vaßen
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  5. O. Guillon
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Correspondence to G. Mauer.

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Mauer, G., Schlegel, N., Guignard, A. et al. Effects of Feedstock Decomposition and Evaporation on the Composition of Suspension Plasma-Sprayed Coatings. J Therm Spray Tech 24, 1187–1194 (2015). https://doi.org/10.1007/s11666-015-0250-2

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  • DOI: https://doi.org/10.1007/s11666-015-0250-2

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