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

Y. Z. Liu; X. B. Hu; Y. L. Zhu; H. Wei; Vinayak P. Dravid; W. W. Zhang

doi:10.1016/j.ceramint.2019.01.208

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

Y. Z. Liu^*, X. B. Hu, Y. L. Zhu, H. Wei, Vinayak P. Dravid, W. W. Zhang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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 language	English (US)
Pages (from-to)	8815-8823
Number of pages	9
Journal	Ceramics International
Volume	45
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2019.01.208
State	Published - May 2019

Funding

This research project was supported by Natural Science Foundation of Zhejiang Province (No. LY18E050027 ), Natural Science Foundation of Ningbo Municipality (No. 2018A610145 ) and Joint Funds of NSFC-ZJ (No. U1609208 ).

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

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10.1016/j.ceramint.2019.01.208

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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.",

keywords = "Isothermal oxidation, Mechanical properties, Microstructural evolution, Thermal barrier coatings (TBCs), Transmission electron microscopy (TEM)",

author = "Liu, \{Y. Z.\} and Hu, \{X. B.\} and Zhu, \{Y. L.\} and H. Wei and Dravid, \{Vinayak P.\} and Zhang, \{W. W.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd and Techna Group S.r.l.",

year = "2019",

month = may,

doi = "10.1016/j.ceramint.2019.01.208",

language = "English (US)",

volume = "45",

pages = "8815--8823",

journal = "Ceramics International",

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TY - JOUR

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

AU - Liu, Y. Z.

AU - Hu, X. B.

AU - Zhu, Y. L.

AU - Wei, H.

AU - Dravid, Vinayak P.

AU - Zhang, W. W.

PY - 2019/5

Y1 - 2019/5

N2 - 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.

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

KW - Mechanical properties

KW - Microstructural evolution

KW - Thermal barrier coatings (TBCs)

KW - Transmission electron microscopy (TEM)

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DO - 10.1016/j.ceramint.2019.01.208

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SN - 0272-8842

VL - 45

SP - 8815

EP - 8823

JO - Ceramics International

JF - Ceramics International

IS - 7

ER -

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

Abstract

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Keywords

ASJC Scopus subject areas

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