Abstract
Degradation of high temperature gas turbine components caused by calcium-rich deposits can lead to exposure of the underlying alloy. Understanding the response of key alloying elements such as chromium to these deposits at high temperatures is critical. In this study, model binary Ni-5 Cr, Ni-10 Cr and Ni-18 Cr alloys (all in wt.%) were exposed to a calcium oxide film at 900°C, 1000°C and 1100°C for 50 h. An outer layer of nickel oxide, inner Cr2O3 scale and an intermediate layer of calcium chromate formed on the Ni-10 Cr and Ni-18 Cr alloys, whereas the Cr2O3 scale was not formed in the Ni-5 Cr alloy. The amount of chromium in the Ni-18 Cr alloy resulted in the formation of a banded structure containing significant amounts of calcium chromates. At 900°C, increasing the Cr content resulted in a thinner oxide scale, while at 1000°C and 1100°C, the external scale thickness increased with Cr content.
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06 November 2023
A Correction to this paper has been published: https://doi.org/10.1007/s11837-023-06249-9
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Acknowledgements
Funding for this project from the Office of Naval Research (ONR Award # N00014-21-1-2751; Mr. Anthony C. Smith, Sr., Director, DoN HBCU/MI Program, and Dr. David Shifler, Technical SME/POC), is gratefully acknowledged. The authors thank Harjot Singh, Ulus Ekerman, Logan Gallegos and Lily Pelayo for their contributions.
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Ury, N., Sanchez, K. & Ravi, V. High Temperature Corrosion of Ni-Cr Alloys Exposed to Calcium Oxide. JOM 75, 5451–5465 (2023). https://doi.org/10.1007/s11837-023-06152-3
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DOI: https://doi.org/10.1007/s11837-023-06152-3