Abstract
To increase the efficiency of turbines for the power generation and the aircraft industry, advanced thermal barrier coatings (TBCs) are required. They need to be long-term stable at temperatures higher than 1200 °C. Nowadays, yttria partially stabilized zirconia (YSZ) is applied as standard TBC material. But its long-term application at temperatures higher than 1200 °C leads to detrimental phase changes and sintering effects. Therefore, new materials have to be investigated, for example, complex perovskites. They provide high melting points, high thermal expansion coefficients and thermal conductivities of approx. 2.0 W/(m K). In this work, the complex perovskite La(Al1/4Mg1/2Ta1/4)O3 (LAMT) was investigated. It was deposited by the suspension plasma spraying (SPS) process, resulting in a columnar microstructure of the coating. The coatings were tested in thermal cycling gradient tests and they show excellent results, even though some phase decomposition was found.
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Acknowledgment
The authors kindly thank Karl-Heinz Rauwald and Frank Vondahlen for their support in the manufacturing of the samples, Michaela Andreas for the preparation of the powder and particle size measurement, Hiltrud Moitroux for the photographs and Nicole Adels for the thermal cycling tests (all Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Werkstoffsynthese und Herstellungsverfahren (IEK-1)).
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Schlegel, N., Sebold, D., Sohn, Y.J. et al. Cycling Performance of a Columnar-Structured Complex Perovskite in a Temperature Gradient Test. J Therm Spray Tech 24, 1205–1212 (2015). https://doi.org/10.1007/s11666-015-0254-y
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DOI: https://doi.org/10.1007/s11666-015-0254-y