Publication detail

Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C

JECH, D. ČELKO, L. KLAKURKOVÁ, L. HUTAŘOVÁ, S. JULIŠ, M. ŠVEJCAR, J.

Original Title

Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C

Type

conference paper

Language

English

Original Abstract

In present work, the influence of isothermal heat treatment on structural changes of conventional thermal barrier coatings (TBCs) was studied. The CoNiCrAlY as metallic bond coat (BC) in thickness of 200 micrometer and 8 wt. % yttria stabilized zirconia (YSZ) as ceramic top coat (TC) in thicknesses of 200, 500 and 1000 micrometer were produced by means of atmospheric plasma spraying (APS). These coatings were sprayed onto the surface of newly developed fine-grained cast polycrystalline nickel-based superalloy Inconel 713LC. As-prepared samples were exposed to the temperature of 1050 C for 10 - 500 hours in ambient atmosphere. In comparison with the initial state, where discontinual islands of alumina were found on the bond coat–top coat interface, the uniform and continuous oxide layer, also termed thermally grown oxide (TGO), was observed there after the isothermal heat treatment. The growth of TGO layer in dependence on dwell time was also found on the expense of depletion of aluminium from the bond coat. Structural changes of bond coat promoted by above mentioned mechanism and growth of TGO were evaluated by means of electron microscopy and image analysis techniques.

Keywords

Thermal Barrier Coatings, Thermally Grown Oxide, Isothermal Heat Treatment, Atmospheric Plasma Spraying, CoNiCrAlY, Structural Stability

Authors

JECH, D.; ČELKO, L.; KLAKURKOVÁ, L.; HUTAŘOVÁ, S.; JULIŠ, M.; ŠVEJCAR, J.

RIV year

2013

Released

15. 5. 2013

Publisher

TANGER Ltd.

Location

Ostrava

ISBN

978-80-87294-41-3

Book

Metal 2013

Edition

1

Pages from

1015

Pages to

1020

Pages count

2068

BibTex

@inproceedings{BUT100894,
  author="David {Jech} and Ladislav {Čelko} and Lenka {Klakurková} and Simona {Hutařová} and Martin {Juliš} and Jiří {Švejcar}",
  title="Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C",
  booktitle="Metal 2013",
  year="2013",
  series="1",
  pages="1015--1020",
  publisher="TANGER Ltd.",
  address="Ostrava",
  isbn="978-80-87294-41-3"
}