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Properties and Performance of High-Purity Thermal Barrier Coatings

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Abstract

It has been found that reducing the level of impurity oxides (particularly SiO2 and Al2O3) in 7YSZ, from about 0.2 wt% to below 0.1 wt% raises the sintering resistance and the phase stability of plasma-sprayed coatings. The implications for the usage of these coatings at elevated temperatures are examined. It is concluded that using relatively high-purity powder of this type is likely to confer substantial benefits in terms of the thermomechanical stability of the coatings under service conditions.

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Acknowledgments

The authors would like to thank Israel Aguilar for technical support. They are also grateful to EPSRC, The Basque Government and the Gates Foundation for financial support.

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Correspondence to A. Cipitria.

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This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007.

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Xie, L., Dorfman, M., Cipitria, A. et al. Properties and Performance of High-Purity Thermal Barrier Coatings. J Therm Spray Tech 16, 804–808 (2007). https://doi.org/10.1007/s11666-007-9079-7

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  • DOI: https://doi.org/10.1007/s11666-007-9079-7

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