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Thermal shock resistance of double-layer thermal barrier coatings

Published online by Cambridge University Press:  30 September 2020

Yang Feng Open the ORCID record for Yang Feng [Opens in a new window] ,
Tian-shun Dong Open the ORCID record for Tian-shun Dong [Opens in a new window] ,
Bin-guo Fu ,
Guo-lu Li Open the ORCID record for Guo-lu Li [Opens in a new window] ,
Qi Liu  and
Ran Wang
Yang Feng
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
Tian-shun Dong*
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
Bin-guo Fu
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
Guo-lu Li*
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
Qi Liu
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
Ran Wang
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Tianjin300130, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

To reveal the thermal shock resistance of double-layer thermal barrier coatings (TBCs), two types of TBCs were prepared via atmospheric plasma spraying, i.e., Gd2Zr2O7/yttria-stabilized zirconia (GZ/YSZ) TBCs and La2Zr2O7 (LZ)/YSZ TBCs, respectively. Subsequently, thermal cycling tests of the two TBCs were conducted at 1100 °C and their thermal shock resistance and failure mechanism were comparatively investigated through experiments and the finite element method. The results showed that the thermal shock failure of the two TBCs occurred inside the top ceramic coating. However, the GZ/YSZ TBCs had longer thermal cycling life. It was the mechanical properties of the top ceramic coating, and the thermal stresses arising from the thermal mismatch between the top ceramic coating and the substrate that determined the thermal cycling life of the two TBCs together. Compared with the LZ layer in the LZ/YSZ TBCs, the GZ layer in the GZ/YSZ TBCs had smaller elastic modulus, larger fracture toughness, and smaller thermal stresses, which led to the higher crack propagation resistance and less spallation tendency of the GZ/YSZ TBCs. Therefore, the GZ/YSZ TBCs exhibited superior thermal shock resistance to the LZ/YSZ TBCs.

Keywords

gadolinium zirconatedouble-layer TBCsthermal shock resistancefinite element methodthermal barrier coatings
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2808 - 2816
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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