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Stresses and Cracking During Chromia-Spinel-NiO Cluster Formation in TBC Systems

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Abstract

Thermal barrier coatings (TBC) are used in gas turbines to reduce the temperatures in the underlying substrate. There are several mechanisms that may cause the TBC to fail; one of them is cracking in the coating interface due to extensive oxidation. In the present study, the role of so called chromia-spinel-NiO (CSN) clusters in TBC failure was studied. Such clusters have previously been found to be prone to cracking. Finite element modeling was performed on a CSN cluster to find out at which stage of its formation it cracks and what the driving mechanisms of cracking are. The geometry of a cluster was obtained from micrographs and modeled as close as possible. Nanoindentation was performed on the cluster to get the correct Young’s moduli. The volumetric expansion associated with the formation of NiO was also included. It was found that the cracking of the CSN clusters is likely to occur during its last stage of formation as the last Ni-rich core oxidizes. Furthermore, it was shown that the volumetric expansion associated with the oxidation only plays a minor role and that the main reason for cracking is the high coefficient of thermal expansion of NiO.

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Acknowledgment

The authors would like to thank Kjell Niklasson at University West for the fruitful discussions and useful suggestions during the modeling work. The authors acknowledge VINNOVA in Sweden for research funding. Esteban Broitman acknowledges the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU # 2009-00971).

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Authors and Affiliations

  1. Siemens AG, Large Gas Turbines, Huttenstr. 12, 10553, Berlin, Germany

    Robert Eriksson

  2. University West, 46186, Trollhättan, Sweden

    Mohit Gupta & Per Nylén

  3. IFM, Linköping University, 58183, Linköping, Sweden

    Esteban Broitman

  4. IEI, Linköping University, 58183, Linköping, Sweden

    Krishna Praveen Jonnalagadda & Ru Lin Peng

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  1. Robert Eriksson
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  2. Mohit Gupta
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Correspondence to Robert Eriksson.

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Eriksson, R., Gupta, M., Broitman, E. et al. Stresses and Cracking During Chromia-Spinel-NiO Cluster Formation in TBC Systems. J Therm Spray Tech 24, 1002–1014 (2015). https://doi.org/10.1007/s11666-015-0270-y

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  • DOI: https://doi.org/10.1007/s11666-015-0270-y

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