Publication result detail

Stability of plasma-sprayed thermal barrier coatings: The role of the waviness of the bond coat and the thickness of the thermally grown oxide layer.

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

Original Title

Stability of plasma-sprayed thermal barrier coatings: The role of the waviness of the bond coat and the thickness of the thermally grown oxide layer.

English Title

Stability of plasma-sprayed thermal barrier coatings: The role of the waviness of the bond coat and the thickness of the thermally grown oxide layer.

Type

WoS Article

Original Abstract

In this paper, the effect of the waviness of the bond coat and the thickness of the thermally grown oxide (TGO) layer on the stability of plasma-sprayed thermal barrier coatings is investigated. Large numbers of threedimensional finite element calculations were performed using a plasma-sprayed MCrAlY+ YSZ thermal barrier coating as a modeled systemand a cosine surface to represent an irregular top-coat/bond-coat interface. Thermal cooling stresses in critical locations (the top coat and the interfaces between the top coat, the TGO, and the bond coat)were evaluated assuming a stress-free initial state and elastic (the substrate, the thermally grown oxide and the top coat) and elastic–ideal plastic (the bond coat) material behavior. The results of this investigation, which have been discussed by taking into account interfacial geometries typical of manufactured coatings, indicate that thewaviness could markedly affect the service lifetime and thus should be considered in both theoretical studies and further experimental endeavors.

English abstract

In this paper, the effect of the waviness of the bond coat and the thickness of the thermally grown oxide (TGO) layer on the stability of plasma-sprayed thermal barrier coatings is investigated. Large numbers of threedimensional finite element calculations were performed using a plasma-sprayed MCrAlY+ YSZ thermal barrier coating as a modeled systemand a cosine surface to represent an irregular top-coat/bond-coat interface. Thermal cooling stresses in critical locations (the top coat and the interfaces between the top coat, the TGO, and the bond coat)were evaluated assuming a stress-free initial state and elastic (the substrate, the thermally grown oxide and the top coat) and elastic–ideal plastic (the bond coat) material behavior. The results of this investigation, which have been discussed by taking into account interfacial geometries typical of manufactured coatings, indicate that thewaviness could markedly affect the service lifetime and thus should be considered in both theoretical studies and further experimental endeavors.

Keywords

Thermal barrier coatings; Plasma spraying; Finite element modeling; Thermally grown oxide; Roughness

Key words in English

Thermal barrier coatings; Plasma spraying; Finite element modeling; Thermally grown oxide; Roughness

Authors

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

RIV year

2016

Released

25.07.2015

ISBN

0257-8972

Periodical

SURFACE & COATINGS TECHNOLOGY

Volume

274

Number

1

State

Swiss Confederation

Pages from

26

Pages to

36

Pages count

11

BibTex

@article{BUT114567,
  author="Petr {Skalka} and Karel {Slámečka} and Jaroslav {Pokluda} and Ladislav {Čelko}",
  title="Stability of plasma-sprayed thermal barrier coatings: The role of the waviness of the bond coat and the thickness of the thermally grown oxide layer.",
  journal="SURFACE & COATINGS TECHNOLOGY",
  year="2015",
  volume="274",
  number="1",
  pages="26--36",
  doi="10.1016/j.surfcoat.2015.04.021",
  issn="0257-8972"
}