The influence of bondcoat and topcoat mechanical properties on stress development in thermal barrier coating systems

EP Busso, ZQ Qian, Mary Taylor, Hugh Evans

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

A finite-element study has been undertaken to investigate the stress development within a TBC system consisting of an EB-PVD YSZ topcoat and a Pt-aluminized diffusion bondcoat. Particular attention has been paid to the role of variables such as the clastic anisotropy within the topcoat, interface roughness, variation in creep strength of the bondcoat and the volumetric strains associated with the formation of the thermally grown oxide (TGO). Bond coat oxidation and thermal loading during cooling give rise to significant tensile stresses within the topcoat and tensile tractions at the TGO interfaces. Bondcoat creep, as distinct from yield and plastic behaviour, was the dominant stress relaxation process, and strong bondcoats (in creep) tended to show higher tensile stress levels. Another important factor determining gave rise to considerably higher stress than a transversely isotropic topeoat. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2349-2361
Number of pages13
JournalActa Materialia
Volume57
Issue number8
DOIs
Publication statusPublished - 1 May 2009

Keywords

  • Sintering
  • Stress analysis
  • Finite element analysis
  • Thermal barrier coating system
  • TBC

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