Journal of Thermal Spray Technology

, Volume 21, Issue 3–4, pp 416–424

Deposition and Characteristics of Submicrometer-Structured Thermal Barrier Coatings by Suspension Plasma Spraying

  • Alexandre Guignard
  • Georg Mauer
  • Robert Vaßen
  • Detlev Stöver
Peer-Reviewed

Abstract

In the field of thermal barrier coatings (TBCs) for gas turbines, suspension plasma sprayed (SPS) submicrometer-structured coatings often show unique mechanical, thermal, and optical properties compared to conventional atmospheric plasma sprayed ones. They have thus the potential of providing increased TBC performances under severe thermo-mechanical loading. Experimental results showed the capability of SPS to obtain yttria stabilized zirconia coatings with very fine porosity and high density of vertical segmentation cracks, yielding high strain tolerance, and low Young’s modulus. The evolution of the coating microstructure and properties during thermal cycling test at very high surface temperature (1400 °C) in our burner rigs and under isothermal annealing was investigated. Results showed that, while segmentation cracks survive, sintering occurs quickly during the first hours of exposure, leading to pore coarsening and stiffening of the coating. In-situ measurements at 1400 °C of the elastic modulus were performed to investigate in more detail the sintering-related stiffening.

Keywords

nanostructured materials segmented coatings suspension spraying thermal barrier coatings (TBCs) thermal cycling Young’s modulus yttria stabilized zirconia (YSZ) 

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Alexandre Guignard
    • 1
  • Georg Mauer
    • 1
  • Robert Vaßen
    • 1
  • Detlev Stöver
    • 1
  1. 1.Institut für Energie- und Klimaforschung (IEK-1), Forschungszentrum Jülich GmbHJülichGermany

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