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La2Zr2O7 (LZ) Coatings by Liquid Feedstock Plasma Spraying: The Role of Precursors

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Abstract

Solution precursor plasma spraying (SPPS) is an innovative process for obtaining finely structured coatings from metallic salt solutions. Lanthanum and zirconium precursors were studied to understand their influence on lanthanum zirconate (La2Zr2O7) synthesis by SPPS. Thermal analysis revealed that the nature of the precursor and the solvent affected mixture decomposition by changing the decomposition temperature. The surface tensions of precursor solutions in various media were investigated and revealed the influence of the nature of the counter-cation. Different solutions of precursor mixtures were used to obtain La2Zr2O7 splats on metallic substrates. A decrease in solution surface tension led to an increase in splat size. Coating mechanisms by SPPS are governed by the nature of the precursors and solvents.

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Acknowledgments

The authors would like to gratefully acknowledge the DGA (French Ministry of Defense) and CNES National R&T program for their financial support.

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Authors and Affiliations

  1. Groupe d’Études des Matériaux Hétérogènes (GEMH), Limoges, France

    William Duarte & Sylvie Rossignol

  2. Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Limoges, France

    William Duarte & Michel Vardelle

  3. Centre National d’Etudes Spatiales (CNES), Paris, France

    William Duarte

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  1. William Duarte
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Correspondence to Sylvie Rossignol.

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Duarte, W., Rossignol, S. & Vardelle, M. La2Zr2O7 (LZ) Coatings by Liquid Feedstock Plasma Spraying: The Role of Precursors. J Therm Spray Tech 23, 1425–1435 (2014). https://doi.org/10.1007/s11666-014-0131-0

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  • DOI: https://doi.org/10.1007/s11666-014-0131-0

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