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• W2088474474 endingPage "6791" @default.
• W2088474474 startingPage "6783" @default.
• W2088474474 abstract "Thermal Barrier Coating (TBC) systems are frequently used in gas turbine engines to provide thermal insulation to the hot-section metallic components and also to protect them from oxidation, hot corrosion and erosion. Surface sealing treatments, namely laser-glazing, have been showing a high potential for extending in-service lifetimes of these systems by improving chemical and thermo-mechanical resistance. In this investigation, both as-sprayed and laser-glazed TBCs were exposed to hot corrosion in molten salts . The glazed coatings were obtained by scanning the surface of the plasma-sprayed coatings with either a CO 2 or a Nd:YAG laser. The hot corrosion investigation was accomplished by subjecting the specimens to an isothermal air furnace testing under V 2 O 5 and/or Na 2 SO 4 at a temperature of 1000 °C for 100 h. Spallation has been observed in coatings in the as-sprayed condition under V 2 O 5 or V 2 O 5 + Na 2 SO 4 . Na 2 SO 4 itself had no or minimal effect on the degradation of the laser-glazed or as-sprayed condition coatings, respectively. The degradation in V 2 O 5 was accomplished by destabilization of YSZ as a consequence of depletion of yttria from the solid solution to form YVO 4 and therefore led to the disruptive transformation of the metastable tetragonal phase to the monoclinic phase. Moreover, the presence of both corrosive salts induced the formation of large high aspect ratio YVO 4 crystals that introduced additional stresses and contributed to the degradation of the coatings. The laser-glazed specimens were not efficient in avoiding the molten salt penetration along the thickness direction due to the presence of cracks on the glazed layer. However due to a reduced specific surface area of the dense glazed layer, the corrosion reaction of the molten salts with the YSZ has been lower than in coatings in the as-sprayed condition." @default.
• W2088474474 created "2016-06-24" @default.
• W2088474474 creator A5056035988 @default.
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• W2088474474 date "2006-08-01" @default.
• W2088474474 modified "2023-10-14" @default.
• W2088474474 title "Evaluation of laser-glazed plasma-sprayed thermal barrier coatings under high temperature exposure to molten salts" @default.
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• W2088474474 doi "https://doi.org/10.1016/j.surfcoat.2005.10.011" @default.
• W2088474474 hasPublicationYear "2006" @default.
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