Abstract
Aluminum and aluminum/silicon coatings were deposited on ferritic–martensitic P92 and austenitic IN-800HT steels in a single-step process from an environmentally friendly slurry. A B2-FeAl phase formed on both the Al and the Al/Si coatings formed on P92. On IN-800HT, both Al and Al/Si grew a B2-(Fe,Ni)Al matrix. An additional ζ2-(Fe,Ni)3Al10 phase was also detected in the Al/Si coatings. The behavior of these coatings was then studied in steam at 650 °C and 1 bar for 2000 h. The uncoated P92 displayed a significant mass gain compared to the coated ones. The coatings also reduced the mass gains of the uncoated IN-800HT but to a lesser extent than in P92. The reduction in kinetics of the coated specimens was attributed to the major formation of a protective α-Al2O3 oxide.
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The authors gratefully acknowledge European Union for the funding of FP7 project “POEMA: Production of Coatings for New Efficient and Clean Coal Power Plant Materials” (Grant Agreement No. 310436).
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Boulesteix, C., Pedraza, F., Proy, M. et al. Steam Oxidation Resistance of Slurry Aluminum and Aluminum/Silicon Coatings on Steel for Ultrasupercritical Steam Turbines. Oxid Met 87, 469–479 (2017). https://doi.org/10.1007/s11085-017-9726-4
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DOI: https://doi.org/10.1007/s11085-017-9726-4