Publication detail

Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with an irregular top-coat/bond-coat interface

SLÁMEČKA, K. SKALKA, P. POKLUDA, J. ČELKO, L.

Original Title

Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with an irregular top-coat/bond-coat interface

Type

journal article in Web of Science

Language

English

Original Abstract

A three-dimensional finite element model of a conventional plasma-sprayed thermal barrier coating was set up with an irregular top-coat/bond-coat interface that was modelled based on the waviness data of a plasma-sprayed coating surface. The residual stresses upon cooling from a high-temperature stress-free state down to a room-temperature stressed state were studied as a function of thickness of the thermally grown oxide (TGO) layer taking into account the plasticity of the bond coat. The calculations indicate that the delamination cracks at the TGO/bond-coat are more likely to appear with progressive oxidation, and, conversely, the initiation of cracks in the top coat at the interfacial peaks in an intact thermal barrier coating is less probable because the tensile stresses in the top coat initially decrease and the tensile regions gradually become smaller and localized due to the observed stress conversion.Based on the obtained results and experimental evidence from the literature, a role of the interfacial topography in the failure sequence is discussed for oxidized and thermally-cycled coatings.

Keywords

Thermal barrier coatings; Thermal stresses; Bond-coat texture; Roughness; Waviness

Authors

SLÁMEČKA, K.; SKALKA, P.; POKLUDA, J.; ČELKO, L.

Released

25. 10. 2016

ISBN

0257-8972

Periodical

Surface and Coatings Technology

Year of study

304

Number

1

State

Swiss Confederation

Pages from

574

Pages to

583

Pages count

10

URL

http://www.sciencedirect.com/science/article/pii/S0257897216306697

BibTex

@article{BUT127386,
  author="Karel {Slámečka} and Petr {Skalka} and Jaroslav {Pokluda} and Ladislav {Čelko}",
  title="Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with an irregular top-coat/bond-coat interface",
  journal="Surface and Coatings Technology",
  year="2016",
  volume="304",
  number="1",
  pages="574--583",
  doi="10.1016/j.surfcoat.2016.07.066",
  issn="0257-8972",
  url="http://www.sciencedirect.com/science/article/pii/S0257897216306697"
}