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Deposition of Columnar-Morphology Lanthanum Zirconate Thermal Barrier Coatings by Solution Precursor Plasma Spraying

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Abstract

Two types of precursor solutions, including lanthanum nitrate and lanthanum chloride, with zirconium acetate, were used to produce lanthanum zirconate coatings by solution precursor plasma spraying (SPPS). Thermal behavior of the precursor solutions, their rheological properties and atomization patterns were investigated by TGA–DSC, viscosity, surface tension and droplet size measurements, respectively. The chloride precursor led to the formation of impure lanthanum zirconate powder including LaOCl and ZrO2, while the nitrate precursor combined with zirconium acetate produced pure lanthanum zirconate powder after pyrolysis. Increasing the salt concentration from 0.125 to 0.5 M led to the formation of solutions with ~ 2.7 times higher viscosity but ~ 7% lower surface tension. The ethanol based solutions had smaller surface tension compared to the water based (24.3 mN/m vs. 62.7 mN/m), while being more viscous (4.8 cp vs. 3.2 cp). The most significant factor affecting the droplet size in atomized solutions was their viscosity. The 0.5 M water-based solutions with about 28 µm median size droplets injected into the plasma plume produced columnar morphology coatings with ~ 23 vol.% porosity.

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Acknowledgments

The authors would like to acknowledge the financial support of the Natural Science and Engineering Research Council Canada, within "Green Surface Engineering for Advanced Manufacturing" (Green-SEAM) Strategic Network, for this work. We also express gratitude to Northwest Mettech Corporation for the collaboration in coatings deposition as well as the University of Toronto, Centre for advanced Coating Technologies, for droplet particle size distribution measurements.

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Authors and Affiliations

  1. Department of Materials Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada

    Maryam Yaghtin, Amirhossein Yaghtin, Zhaolin Tang & Tom Troczynski

  2. Department of Materials Science and Engineering, College of Chemical and Metallurgical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

    Amirhossein Yaghtin

  3. Department of Materials Science and Engineering, School of Engineering, Shiraz University, 7134851154, Shiraz, Iran

    Pooria Najafisayar

  4. Northwest Mettech Corporation, Surrey, BC, V4N 4C4, Canada

    Zhaolin Tang

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  1. Maryam Yaghtin
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Correspondence to Maryam Yaghtin.

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The original online version of this article was revised: In the Results and discussion section, Figure 5 appeared with a spelling error in the y-axis label. In the Results and discussion section, the Figure 6 that appeared is a duplicate of Figure 5.

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Yaghtin, M., Yaghtin, A., Najafisayar, P. et al. Deposition of Columnar-Morphology Lanthanum Zirconate Thermal Barrier Coatings by Solution Precursor Plasma Spraying. J Therm Spray Tech 30, 1850–1861 (2021). https://doi.org/10.1007/s11666-021-01258-z

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