Effects of isothermal oxidation on microstructure and mechanical properties of thermal barrier coatings

Y. Z. Liu, Xiaobing Hu, Y. L. Zhu, H. Wei, Vinayak P Dravid, W. W. Zhang

Research output: Contribution to journalArticle

Abstract

An 8 (wt.) % yttria partially stabilized zirconia (YSZ) coating isothermally oxidized in air at 1100 °C for up to 3000 h was investigated by means of indentation and electron microscopy analyses. It is found that the growth kinetics of thermally grown oxides followed a parabolic law. The apparent porosity within the coatings decreased after isothermal oxidation. The tetragonal prime YSZ phase transformed into cubic and then monoclinic phases during isothermal oxidation. Elastic modulus, microhardness and fracture toughness of the coating increased as oxidation duration prolonged. The correlation between microstructural variation and mechanical properties was discussed.

Original languageEnglish (US)
Pages (from-to)8815-8823
Number of pages9
JournalCeramics International
Volume45
Issue number7
DOIs
StatePublished - May 1 2019

Fingerprint

Thermal barrier coatings
Yttria stabilized zirconia
Coatings
Oxidation
Mechanical properties
Microstructure
Growth kinetics
Indentation
Microhardness
Oxides
Electron microscopy
Fracture toughness
Porosity
Elastic moduli
Air

Keywords

  • Isothermal oxidation
  • Mechanical properties
  • Microstructural evolution
  • Thermal barrier coatings (TBCs)
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "Effects of isothermal oxidation on microstructure and mechanical properties of thermal barrier coatings",
abstract = "An 8 (wt.) {\%} yttria partially stabilized zirconia (YSZ) coating isothermally oxidized in air at 1100 °C for up to 3000 h was investigated by means of indentation and electron microscopy analyses. It is found that the growth kinetics of thermally grown oxides followed a parabolic law. The apparent porosity within the coatings decreased after isothermal oxidation. The tetragonal prime YSZ phase transformed into cubic and then monoclinic phases during isothermal oxidation. Elastic modulus, microhardness and fracture toughness of the coating increased as oxidation duration prolonged. The correlation between microstructural variation and mechanical properties was discussed.",
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Effects of isothermal oxidation on microstructure and mechanical properties of thermal barrier coatings. / Liu, Y. Z.; Hu, Xiaobing; Zhu, Y. L.; Wei, H.; Dravid, Vinayak P; Zhang, W. W.

In: Ceramics International, Vol. 45, No. 7, 01.05.2019, p. 8815-8823.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of isothermal oxidation on microstructure and mechanical properties of thermal barrier coatings

AU - Liu, Y. Z.

AU - Hu, Xiaobing

AU - Zhu, Y. L.

AU - Wei, H.

AU - Dravid, Vinayak P

AU - Zhang, W. W.

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AB - An 8 (wt.) % yttria partially stabilized zirconia (YSZ) coating isothermally oxidized in air at 1100 °C for up to 3000 h was investigated by means of indentation and electron microscopy analyses. It is found that the growth kinetics of thermally grown oxides followed a parabolic law. The apparent porosity within the coatings decreased after isothermal oxidation. The tetragonal prime YSZ phase transformed into cubic and then monoclinic phases during isothermal oxidation. Elastic modulus, microhardness and fracture toughness of the coating increased as oxidation duration prolonged. The correlation between microstructural variation and mechanical properties was discussed.

KW - Isothermal oxidation

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KW - Microstructural evolution

KW - Thermal barrier coatings (TBCs)

KW - Transmission electron microscopy (TEM)

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