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Coatings 2016, 6(4), 49; doi:10.3390/coatings6040049

Atmospheric Plasma Spraying of Single Phase Lanthanum Zirconate Thermal Barrier Coatings with Optimized Porosity

Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-1); 52425 Jülich, Germany
This article was presented as a key note lecture at the 30th International Conference on Surface Modification Technologies (SMT30), held 29 June–1 July 2016, in Milan, Italy, and has been expanded from the original conference proceedings.
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Academic Editor: Alessandro Lavacchi
Received: 16 August 2016 / Revised: 7 October 2016 / Accepted: 14 October 2016 / Published: 18 October 2016
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Abstract

The shortcomings at elevated operation temperatures of the standard material yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs) have initiated many research activities seeking alternatives. One candidate is the pyrochlore lanthanum zirconate La2Zr2O7 (LZ), which is phase-stable to its melting point. At the same time, it shows a lower thermal conductivity and a lower sintering tendency when compared to YSZ. Because of its low thermal expansion coefficient and poor toughness, it is applied in combination with YSZ in double layer TBC systems. It is the current state of knowledge that LZ is prone to lanthanum depletion if processed by plasma spraying. The process conditions have to be selected carefully to avoid this. Furthermore, the amount and morphology of the coating porosity is essential for a good thermo-mechanical performance. In this work, the development and testing of LZ/YSZ double layer TBC systems is described. Initially, suitable basic parameters (torch, plasma gas composition, and power) were tested with respect to coating stoichiometry. Then, microstructures were optimized by adjusting feed rate, spray distance, and by selecting a more appropriate feedstock. Powder particles and coatings were characterized by digital image analysis. View Full-Text
Keywords: lanthanum zirconate; thermal barrier coating; microstructure; atmospheric plasma spraying lanthanum zirconate; thermal barrier coating; microstructure; atmospheric plasma spraying
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mauer, G.; Du, L.; Vaßen, R. Atmospheric Plasma Spraying of Single Phase Lanthanum Zirconate Thermal Barrier Coatings with Optimized Porosity. Coatings 2016, 6, 49.

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