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Oxidation behaviour of HVAF-sprayed NiCr coating in moisture-laden environment
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0002-7663-9631
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
Chalmers University of Technology, Department of Environmental Inorganic Chemistry, Gothenburg, 412 96, Sweden.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc. , 2017, Vol. 2, s. 644-646Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Reducing CO2 emissions from power generation plants is intimately related to enhancing their thermal efficiency, which can be achieved by increasing the temperature/pressure of steam. However, any increase in steam temperature is inevitably accompanied by accelerated oxidation of boiler components. The use of renewable fuels such as biomass increases the problem by introducing a number of corrosive compounds into the boiler environment, resulting in more rapid degradation of components. Although thermal sprayed coatings are techno-commercially attractive solutions for augmenting the durability of degradation-prone boiler components and are already used, further improvements in their performance are continuously sought. High-velocity air fuel (HVAF) coatings are promising in this context. In the present work, isothermal oxidation behavior of a candidate HVAF-sprayed Ni21Cr was studied in N2 + 5% O2 + 20% H2O at 600°C for 168h. The oxide scale growth mechanisms were studied by BIB/SEM/EDX to evaluate the effectiveness of the coatings. It was found that the water vapor effect is insignificant due to the Cr reservoir in the Ni21Cr coating, which yielded enhanced oxidation protection by forming nano-scale Cr2O3

sted, utgiver, år, opplag, sider
New York: Curran Associates, Inc. , 2017. Vol. 2, s. 644-646
Emneord [en]
Air, Binary alloys, Boiler corrosion, Boilers, Nanotechnology, Oxidation, Reservoirs (water), Scale (deposits), Accelerated oxidations, Attractive solutions, High velocity air fuels, Isothermal oxidations, Oxidation protection, Power generation plants, Reducing co2 emissions, Thermal sprayed coating, Sprayed coatings
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-13053Scopus ID: 2-s2.0-85047445276ISBN: 9781510858220 (tryckt)OAI: oai:DiVA.org:hv-13053DiVA, id: diva2:1259255
Konferanse
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Tilgjengelig fra: 2018-10-29 Laget: 2018-10-29 Sist oppdatert: 2019-01-10bibliografisk kontrollert

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