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Journal of Advanced Ceramics 2022, 11(9): 1445-1456 https://doi.org/10.1007/s40145-022-0622-2
Research Article | Open Access | Issue | Published: 17 August 2022

In-situ synthesis of gadolinium niobate quasi-binary composites with balanced mechanical and thermal properties for thermal barrier coatings

Show Author's Information Yi HANa,  Peng-an ZONGa,  Muzhang HUANGa,  Zesheng YANGa,  Yingjie FENGa,  Wei PANa,  Peng ZHANGa,b( ),  Chunlei WANa( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
Keywords:
thermal conductivity, fracture toughness, residual stress, thermal barrier coating (TBC)
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HAN Y, ZONG P-a, HUANG M, et al. In-situ synthesis of gadolinium niobate quasi-binary composites with balanced mechanical and thermal properties for thermal barrier coatings. Journal of Advanced Ceramics, 2022, 11(9): 1445-1456. https://doi.org/10.1007/s40145-022-0622-2
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Abstract Full text Electronic supplementary material About this article

Yttria-stabilized zirconia (YSZ) has been used as a thermal barrier coating (TBC) material in gas turbines for several decades. Although continuous efforts have been made to develop novel TBC materials that can work at a higher temperature, no single material other than YSZ has all the desired attributes for the TBCs. In this paper, we report the in-situ synthesis of quasi-binary GdNbO4/Gd3NbO7 composites based on the simple Gd2O3–Nb2O5 binary phase diagram. The fracture toughness of these quasi-binary composites is remarkably enhanced compared with the value predicted by the rule of mixtures because the ferroelastic domain switching is more activated due to the residual stress in the quasi-binary composites, which triggers more crack defections due to the enlarged process zone. Additionally, the Gd3NbO7 phase provides a low thermal conductivity due to the substantial chemical inhomogeneity, which diffuses phonons. Gd3NbO7/GdNbO4 exhibits a balanced thermal conductivity of 1.6 W/(m·K) at 1073 K and a toughness value of 2.76 MPa·m0.5, and these values are among the best comprehensive properties that have been obtained for new TBC materials. The work demonstrates a feasible approach of designing a new TBC material with balanced properties and can be easily fabricated.


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Electronic supplementary material
About this article

In-situ synthesis of gadolinium niobate quasi-binary composites with balanced mechanical and thermal properties for thermal barrier coatings

Show Author's information Yi HANa, Peng-an ZONGa, Muzhang HUANGa, Zesheng YANGa, Yingjie FENGa, Wei PANa, Peng ZHANGa,b( ), Chunlei WANa( )
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Abstract

Yttria-stabilized zirconia (YSZ) has been used as a thermal barrier coating (TBC) material in gas turbines for several decades. Although continuous efforts have been made to develop novel TBC materials that can work at a higher temperature, no single material other than YSZ has all the desired attributes for the TBCs. In this paper, we report the in-situ synthesis of quasi-binary GdNbO4/Gd3NbO7 composites based on the simple Gd2O3–Nb2O5 binary phase diagram. The fracture toughness of these quasi-binary composites is remarkably enhanced compared with the value predicted by the rule of mixtures because the ferroelastic domain switching is more activated due to the residual stress in the quasi-binary composites, which triggers more crack defections due to the enlarged process zone. Additionally, the Gd3NbO7 phase provides a low thermal conductivity due to the substantial chemical inhomogeneity, which diffuses phonons. Gd3NbO7/GdNbO4 exhibits a balanced thermal conductivity of 1.6 W/(m·K) at 1073 K and a toughness value of 2.76 MPa·m0.5, and these values are among the best comprehensive properties that have been obtained for new TBC materials. The work demonstrates a feasible approach of designing a new TBC material with balanced properties and can be easily fabricated.

Keywords: thermal conductivity, fracture toughness, residual stress, thermal barrier coating (TBC)

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Publication history

Received: 20 February 2022
Revised: 07 June 2022
Accepted: 16 June 2022
Published: 17 August 2022
Issue date: September 2022

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© The Author(s) 2022.

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2021YFB3702300), the National Natural Science Foundation of China (No. 52022042), and the China Postdoctoral Science Foundation (No. 2019M650670).

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