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Influence of Microstructure on Thermal Properties of Axial Suspension Plasma-Sprayed YSZ Thermal Barrier Coatings

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Abstract

Suspension plasma spraying is a relatively new thermal spaying technique to produce advanced thermal barrier coatings (TBCs) and enables production of coatings with a variety of structures—highly dense, highly porous, segmented, or columnar. This work investigates suspension plasma-sprayed TBCs produced using axial injection with different process parameters. The influence of coating microstructure on thermal properties was of specific interest. Tests carried out included microstructural analysis, phase analysis, determination of porosity, and pore size distribution, as well as thermal diffusivity/conductivity measurements. Results showed that axial suspension plasma spraying process makes it possible to produce various columnar-type coatings under different processing conditions. Significant influence of microstructural features on thermal properties of the coatings was noted. In particular, the process parameter-dependent microstructural attributes, such as porosity, column density, and crystallite size, were shown to govern the thermal diffusivity and thermal conductivity of the coating.

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Acknowledgments

The authors would like to thank Stefan Björklund from University West, Trollhättan to help in planning the spray trials for all the samples. Authors are also thankful to Toni Bogdanoff from Jönköping University for help in performing LFA experiments. The authors also thank to Mrs. Sneha Goel from IIT Kanpur, India for capturing the SEM micrographs at University West.

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Authors and Affiliations

  1. University West, 46186, Trollhättan, Sweden

    Ashish Ganvir, Nicholas Curry, Nicolaie Markocsan, Per Nylén & Shrikant Joshi

  2. IPP, Prague, Czech Republic

    Monika Vilemova & Zdenek Pala

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  1. Ashish Ganvir
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  2. Nicholas Curry
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  3. Nicolaie Markocsan
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  4. Per Nylén
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Correspondence to Ashish Ganvir.

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Ganvir, A., Curry, N., Markocsan, N. et al. Influence of Microstructure on Thermal Properties of Axial Suspension Plasma-Sprayed YSZ Thermal Barrier Coatings. J Therm Spray Tech 25, 202–212 (2016). https://doi.org/10.1007/s11666-015-0355-7

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  • DOI: https://doi.org/10.1007/s11666-015-0355-7

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