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Nanostructured Gd2Zr2O7: a promising thermal barrier coating with high resistance to CaO–MgO–Al2O3–SiO2 corrosion

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Abstract

Nanostructured Gd2Zr2O7(NGZO) thermal barrier coatings (TBCs) have great potential applications in airplane engines and hot sections of gas turbine engines operating in volcanic ash-exposed or dust-laden environments. In this paper, NGZO is deposited on IN738LC/CoNiCrAlY using the atmospheric plasma spraying (APS) technique. Also, yttria-stabilized zirconia (YSZ) was utilized to produce conventional TBC. The CaO–MgO–Al2O3–SiO2 (CMAS) corrosion resistance and phase stability of IN738LC/CoNiCrAlY/YSZ (YSZ: ZrO2 4 mol.% Y2O3 as the conventional TBCs) and IN738LC/CoNiCrAlY/NGZO (NGZO: ZrO2 33 mol.% Gd2O3 as the new generation of TBCs) were assessed at 1250 ˚C by 5-h cycles with and without the presence of CMAS particles. The X-ray diffraction (XRD) analysis and microstructural investigations by field emission scanning electron microscopy (FESEM) equipped with an energy-dispersive X-ray spectroscope (EDS) revealed that NGZO coatings had high resistance against penetration of CMAS particles by forming an accelerate non-permeable Gd8Ca2(SiO4)6. Also, the qualitative and quantitative XRD analyses by the Rietveld refinement method indicated that the NGZO coating maintained its phase stability during the thermal cycles after 20 h of exposure to 1250 °C.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank the honorable managing director of the “Barad Technology Co” (a new technology-based firm, https://www.baradtechno.ir), Dr. Mahmoud Shahriari, and all of the personnel who work in the research and development department of the company.

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  1. Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran

    M. Bahamirian

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Bahamirian, M. Nanostructured Gd2Zr2O7: a promising thermal barrier coating with high resistance to CaO–MgO–Al2O3–SiO2 corrosion. J Aust Ceram Soc 59, 165–177 (2023). https://doi.org/10.1007/s41779-022-00822-2

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