Journal of Thermal Spray Technology

, Volume 13, Issue 3, pp 432–442

Sintering and creep processes in plasma-sprayed thermal barrier coatings

  • M. Ahrens
  • R. Vaßen
  • D. Stöver
  • S. Lampenscherf
Reviewed Papers

DOI: 10.1361/10599630420434

Cite this article as:
Ahrens, M., Vaßen, R., Stöver, D. et al. J Therm Spray Tech (2004) 13: 432. doi:10.1361/10599630420434

Abstract

During operation at elevated temperatures, sintering processes can significantly influence the mechanical properties of thermal barrier coatings (TBCs) by increasing Young’s modulus and reducing strain tolerance. These changes of the mechanical response of TBCs were investigated using free-standing plasma-sprayed TBCs in a thermomechanical analysis (TMA) facility. The time-dependent change of Young’s modulus was determined in situ in a flexure mode at different annealing temperatures. In addition, relaxation processes during loading and unloading were monitored. The time-dependent deformation behavior of the TBC sample can be described by a simple viscoelastic approach (Burgers model). Viscosity data are determined as a function of annealing temperature and time.

Keywords

bending tests Burgers model thermal barrier coatings viscosity Young’s modulus 

Copyright information

© ASM International 2004

Authors and Affiliations

  • M. Ahrens
    • 1
  • R. Vaßen
    • 1
  • D. Stöver
    • 1
  • S. Lampenscherf
    • 2
  1. 1.Forschungszentrum Jülich GmbH, Institut für Werkstoffe und Verfahren der Energietechnik 1JülichGermany
  2. 2.Siemens AG, Corporate TechnologyMunichGermany

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