Publication detail

Bending fatigue failure of atmospheric-plasma-sprayed CoNiCrAlY + YSZ thermal barrier coatings

SLÁMEČKA, K. ČELKO, L. SKALKA, P. POKLUDA, J. NĚMEC, K. JULIŠ, M. KLAKURKOVÁ, L. ŠVEJCAR, J.

Original Title

Bending fatigue failure of atmospheric-plasma-sprayed CoNiCrAlY + YSZ thermal barrier coatings

Type

journal article in Web of Science

Language

English

Original Abstract

Bending fatigue failure of conventional atmospheric-plasma-sprayed CoNiCrAlY + ZrO2–8 wt.% Y2O3 thermal barrier coatings with/without the thermally grown oxide layer generated between the bond coat and the top coat was experimentally studied at room temperature. Microscopical and profilometrical characterization of as-received and fractured specimens and a simplified finite element study of cooling thermal stresses show that the same fatigue strength of both the as-coated and the oxidized specimens (i.e. its insensitivity to the presence of the thermally grown oxide) is most likely caused by a preferential through-the-thickness cracking of the thermally grown oxide layer. Moreover, the bond-coat/substrate interface is identified as the weakest part of the studied thermal barrier system under both low and high crack growth rates.

Keywords

Thermal barrier coatings, Fatigue, Crack path, FEM

Authors

SLÁMEČKA, K.; ČELKO, L.; SKALKA, P.; POKLUDA, J.; NĚMEC, K.; JULIŠ, M.; KLAKURKOVÁ, L.; ŠVEJCAR, J.

RIV year

2015

Released

1. 1. 2015

ISBN

0142-1123

Periodical

INTERNATIONAL JOURNAL OF FATIGUE

Year of study

70

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

186

Pages to

195

Pages count

10

BibTex

@article{BUT110074,
  author="Karel {Slámečka} and Ladislav {Čelko} and Petr {Skalka} and Jaroslav {Pokluda} and Karel {Němec} and Martin {Juliš} and Lenka {Klakurková} and Jiří {Švejcar}",
  title="Bending fatigue failure of atmospheric-plasma-sprayed CoNiCrAlY + YSZ thermal barrier coatings",
  journal="INTERNATIONAL JOURNAL OF FATIGUE",
  year="2015",
  volume="70",
  number="1",
  pages="186--195",
  doi="10.1016/j.ijfatigue.2014.09.009",
  issn="0142-1123"
}