Journal of Thermal Spray Technology

, Volume 9, Issue 2, pp 191–197

Failure of physical vapor deposition/plasma-sprayed thermal barrier coatings during thermal cycling

  • V. Teixeira
  • M. Andritschky
  • H. Gruhn
  • W. Malléner
  • H. P. Buchkremer
  • D. Stöver
Article

DOI: 10.1361/105996300770349917

Cite this article as:
Teixeira, V., Andritschky, M., Gruhn, H. et al. J Therm Spray Tech (2000) 9: 191. doi:10.1361/105996300770349917

Abstract

ZrO2-7 wt.% Y2O3 plasma-sprayed (PS) coatings were applied on high-temperature Ni-based alloys precoated by physical vapor deposition with a thin, dense, stabilized zirconia coating (PVD bond coat). The PS coatings were applied by atmospheric plasma spraying (APS) and inert gas plasma spraying (IPS) at 2 bar for different substrate temperatures. The thermal barrier coatings (TBCs) were tested by furnace isothermal cycling and flame thermal cycling at maximum temperatures between 1000 and 1150 °C. The temperature gradients within the duplex PVD/PS thermal barrier coatings during the thermal cycling process were modeled using an unsteady heat transfer program. This modeling enables calculation of the transient thermal strains and stresses, which contributes to a better understanding of the failure mechanisms of the TBC during thermal cycling. The adherence and failure modes of these coating systems were experimentally studied during the high-temperature testing. The TBC failure mechanism during thermal cycling is discussed in light of coating transient stresses and substrate oxidation.

Keywords

zirconia coatings plasma spraying sputtering stress modeling TBC failure mechanisms thermal cycling 

Copyright information

© ASM International 2000

Authors and Affiliations

  • V. Teixeira
    • 1
  • M. Andritschky
    • 1
  • H. Gruhn
    • 2
  • W. Malléner
    • 2
  • H. P. Buchkremer
    • 2
  • D. Stöver
    • 2
  1. 1.Physics DepartmentUniversity of MinhoBragaPortugal
  2. 2.Institute for Materials and Processes in Energy SystemsForschungszentrum Julich GmbH, IWV-2JulichGermany

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