Detail publikace

High Temperature Degradation of YSZ/EUCOR TBC Coating System during Low Cycle Fatigue Tests

ŠULÁK, I. OBRTLÍK, K. ČELKO, L. GEJDOŠ, P.

Originální název

High Temperature Degradation of YSZ/EUCOR TBC Coating System during Low Cycle Fatigue Tests

Typ

abstrakt

Jazyk

angličtina

Originální abstrakt

Thermal barrier coatings are widely used to protect the substrate from high temperature and extremely aggressive environments in gas engines. In the present article, authors have been studied degradation of complex thermal barrier coating system deposited on polycrystalline nickel superalloy IN 713LC. The substrate material was grit blasted with alumina (Al2O3) particles prior to air plasma deposition of CoNiCrAlY bond coat. Top coat consists of conventional zirconia (ZrO2) stabilized by yttria (Y2O3) -YSZ ceramic in combination with a eutectic nanocrystalline ceramic Eucor made of zirconia (ZrO2), alumina (Al2O3) and silicia (SiO2) –in the ratio of 50/50 in wt. %. The top coat was deposited using water stabilized plasma. Test specimens with the TBC coating system were fatigued under strain control condition in fully reversed symmetrical push-pull cycles at 900°C in air. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating hardness and thickness were measured. Fracture surface and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. TBC delamination was observed at the top coat/bond coat interface after cyclic loading at high temperature. Fatigue crack initiation sites are documented. Majority of fatigue cracks start from the surface and top coat/bond coat interface.

Klíčová slova

High temperature fatigue; damage mechanisms; YSZ/ZrO2-Al2O3-SiO2; CoNiCrAlY; IN 713LC

Autoři

ŠULÁK, I.; OBRTLÍK, K.; ČELKO, L.; GEJDOŠ, P.

Vydáno

27. 6. 2016

Nakladatel

Brno University of Technology

Místo

Brno, Czech Republic

ISBN

978-80-214-5357-9

Kniha

Materials Structure & Micromechanics of Fracture

Edice

1

Číslo edice

1

Strany od

219

Strany do

219

Strany počet

1

BibTex

@misc{BUT130363,
  author="Ivo {Šulák} and Karel {Obrtlík} and Ladislav {Čelko} and Pavel {Gejdoš}",
  title="High Temperature Degradation of YSZ/EUCOR TBC Coating System during Low Cycle Fatigue Tests",
  booktitle="Materials Structure & Micromechanics of Fracture",
  year="2016",
  series="1",
  edition="1",
  pages="219--219",
  publisher="Brno University of Technology",
  address="Brno, Czech Republic",
  isbn="978-80-214-5357-9",
  note="abstract"
}