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Thermal Conductivity in Suspension Sprayed Thermal Barrier Coatings: Modeling and Experiments

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Abstract

Axial suspension plasma spraying (ASPS) can generate microstructures with higher porosity and pores in the size range from submicron to nanometer. ASPS thermal barrier coatings (TBC) have already shown a great potential to produce low thermal conductivity coatings for gas turbine applications. It is important to understand the fundamental relationships between microstructural defects in ASPS coatings such as crystallite boundaries, porosity etc. and thermal conductivity. Object-oriented finite element (OOF) analysis has been shown as an effective tool for evaluating thermal conductivity of conventional TBCs as this method is capable of incorporating the inherent microstructure in the model. The objective of this work was to analyze the thermal conductivity of ASPS TBCs using experimental techniques and also to evaluate a procedure where OOF can be used to predict and analyze the thermal conductivity for these coatings. Verification of the model was done by comparing modeling results with the experimental thermal conductivity. The results showed that the varied scaled porosity has a significant influence on the thermal conductivity. Smaller crystallites and higher overall porosity content resulted in lower thermal conductivity. It was shown that OOF could be a powerful tool to predict and rank thermal conductivity of ASPS TBCs.

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Acknowledgments

The authors would like to acknowledge Nicholas Curry and Stefan Björklund at University West, Sweden for spraying the coatings. Authors would also like to thank Zdenek Pala, Institute of Plasma Physics, Czech Republic for performing the XRD analysis on these coatings.

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    Authors and Affiliations

    1. University West, 46186, Trollhättan, Sweden

      Ashish Ganvir, Chamara Kumara, Mohit Gupta & Per Nylen

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    1. Ashish Ganvir
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    2. Chamara Kumara
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    3. Mohit Gupta
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    4. Per Nylen
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    Correspondence to Mohit Gupta.

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    Ashish Ganvir and Chamara Kumara have contributed equally to this article.

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    Ganvir, A., Kumara, C., Gupta, M. et al. Thermal Conductivity in Suspension Sprayed Thermal Barrier Coatings: Modeling and Experiments. J Therm Spray Tech 26, 71–82 (2017). https://doi.org/10.1007/s11666-016-0503-8

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    • DOI: https://doi.org/10.1007/s11666-016-0503-8

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