Abstract
The cyclic carburization of electrodeposited pure and CeO2-dispersed Ni3Al intermetallic coatings on Fe–Ni–Cr alloys has been investigated at 850 and 1050°C for periods up to 500 h in a reducing 2%CH4–H2 atmosphere. At 850°C, all Ni3Al-base-coating samples showed excellent carburization resistance and slow mass increases due to the formation of a thin γ-Al2O3 scale and a low carbon activity (a c = 0.73). At 1050°C and a high carbon activity (a c = 3.21), all coatings are superior to the uncoated Fe–Ni–Cr alloy in terms of carburization resistance. A thin α-Al2O3 scale slowly formed on all Ni3Al coatings effectively blocked the carbon attack. The addition of CeO2 particles in the Ni3Al coatings significantly mitigated the cracking of the α-Al2O3 scale and the resultant internal oxidation and carburization. For all coatings, Ni-rich particles were found to be formed on the α-Al2O3 scale during oxidation, which had led to the deposition of catalytic coke.
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The authors would like to thank the Natural Sciences and Engineering Research Council of Canada and Nova Chemicals Limited for financial support.
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Liu, H., Chen, W. Carburization Behavior of Electrodeposited Ni3 Al–CeO2-Base Coatings on Fe–Ni–Cr Alloys. Oxid Met 67, 129–152 (2007). https://doi.org/10.1007/s11085-006-9040-z
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DOI: https://doi.org/10.1007/s11085-006-9040-z