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- W2204848468 abstract "Fuel used in diesel engines for naval propulsion contains high levels of impurities, principally vanadium and sulfates, that can react to form aggressive compounds, responsible for hot corrosion phenomena, leading to severe degradation of the engines' components, especially exhaust valves. A protective coating is thus required to increase the service life of the valves in the highly corrosive environment. In this work five different thermal-sprayed metal-ceramic coatings are selected as potential candidates and their hot corrosion resistance is investigated and discussed in terms of microstructure evolution and hot corrosion kinetics. Four coatings were deposited by either HVOF or APS processes starting from commercial powders (Cr3C2–CoNiCrAlY, Cr3C2–self fusing alloy, Cr3C2–NiCrAlY, Cr3C2–NiCr), optimizing deposition parameters by DoE technique. The last composite coating was purposely designed including silica nanoparticles and ceramic fillers (mullite) in a NiCr matrix, and was deposited by HVOF. Microstructural characteristics of each coating in the as-sprayed conditions were evaluated by measuring porosity and microhardness. Hot corrosion tests were performed on samples covered with a mixture of Na2SO4 and V2O5 and placed in a furnace at 700 °C in air for different times (5, 25, 50, 75 and 100 h). Finally, EDS and XRD analyses were carried out on the corroded samples." @default.
- W2204848468 created "2016-06-24" @default.
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- W2204848468 date "2016-06-01" @default.
- W2204848468 modified "2023-10-15" @default.
- W2204848468 title "Thermal sprayed coatings for hot corrosion protection of exhaust valves in naval diesel engines" @default.
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- W2204848468 doi "https://doi.org/10.1016/j.surfcoat.2015.10.072" @default.
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