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Analysis of the Microhardness and the Porosity in Graded Thermal Barrier Coatings

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Nanostructured Materials and Coatings for Biomedical and Sensor Applications

Part of the book series: NATO Science Series ((NAII,volume 102))

Abstract

Thermal barrier coatings (TBC’s) are used in a number of energy-related applications, such as protective layers in aero and land based gas turbine components at very high temperature.

In this paper we present a study on the relationship between the porosity and the microhardness in ZrO2 — 8 wt% Y2O3 thermal barrier coatings (TBC’s) prepared by atmospheric plasma spraying. in order to produce different porosities, with a variation along the cross section the plasma spraying parameters were varied during each deposition cycle.

The microhardness was measured with a Vickers indenter and 0.981 N load. The microhardness has been evaluated for coatings in as-sprayed condition and after annealing at 1100 °C during 100h. The results show a fast increase of the hardness after annealing.

Scanning Electron Microscopy (SEM) was used to acquire the micrographs from polished cross-sections for image analysis with appropriate software. Differences in grey levels allowed us to estimate porosity as well as the porosity profile through the thickness of the coating.

Absolute opened porosity was measured with a mercury porosimetry and by image analysis. The second technique was also used to estimate the porosity variation along the cross section. The variation of the microhardness with porosity for various coatings, and along the cross section for each coating is presented.

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Author information

Authors and Affiliations

  1. University of Minho — Physics Department, GRF-Functional Coatings Group, Campus de Azurém, 4800, Guimarães, Portugal

    A. Portinha & V. Teixeira

  2. University of Minho — Mechanical engineering Department, Campus de Azurém, 4800, Guimarães, Portugal

    J. Martins

  3. University of Minho — Physics Department, Campus de Gualtar, 4700, Braga, Portugal

    M. F. Costa

  4. Institute for Materials and Processes in Energy Systems 1, Forschungszentrum Julich GmbH, D-52425, Julich, Germany

    R. Vassen & D. Stoever

Authors
  1. A. Portinha
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  2. V. Teixeira
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  3. J. Martins
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  4. M. F. Costa
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  5. R. Vassen
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  6. D. Stoever
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Corresponding author

Correspondence to V. Teixeira .

Editor information

Editors and Affiliations

  1. Department of Materials Engineering, Drexel University, Philadelphia, USA

    Y. G. Gogotsi

  2. Institute for Problems of Materials Science, National Academy of Science, Kiev, Ukraine

    Irina V. Uvarova

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© 2003 Springer Science+Business Media Dordrecht

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Portinha, A., Teixeira, V., Martins, J., Costa, M.F., Vassen, R., Stoever, D. (2003). Analysis of the Microhardness and the Porosity in Graded Thermal Barrier Coatings. In: Gogotsi, Y.G., Uvarova, I.V. (eds) Nanostructured Materials and Coatings for Biomedical and Sensor Applications. NATO Science Series, vol 102. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0157-1_15

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  • DOI: https://doi.org/10.1007/978-94-010-0157-1_15

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-1321-8

  • Online ISBN: 978-94-010-0157-1

  • eBook Packages: Springer Book Archive

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