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- Title
High Temperature Corrosion of Ni-Cr Alloys Exposed to Calcium Oxide.
- Authors
Ury, Nicholas; Sanchez, Karla; Ravi, Vilupanur
- 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.
- Subjects
CALCIUM alloys; LIME (Minerals); CORROSION in alloys; NICKEL-chromium alloys; HIGH temperatures; NICKEL oxide; ALLOYS
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5451
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06152-3