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• W2022081625 abstract "V2O5 reaction and melt infiltration in plasma-sprayed 7 wt% Y2O3–ZrO2 (YSZ) coatings were investigated at temperatures ranging from 750 °C to 1200 °C using SEM and TEM combined with EDS. The interlamellar pores and intralamellar cracks, common in plasma-sprayed materials, provide pathway for the molten species. The microstructure of the contaminated coatings is therefore the result of the interplay between the dissolution/reaction rates of the V2O5 with YSZ coating and the infiltration rates of the molten species. Near the coating surface, the reaction front proceeds in a planar fashion, via dissolution of the lamella and precipitation of fine-grained reaction products composed of ZrV2O7 (for reactions at 750 °C and below), m-ZrO2 and YVO4. The thickness of this planar reaction zone or PRZ was found to increase as reaction time and temperature increased. The melted V2O5 was observed to infiltrate along the characteristic microstructure of plasma-sprayed coatings, i.e. the interconnected pores and cracks, and react with the YSZ. The thickness of this melt infiltrated reaction zone or MIRZ ranged from 5 μm for reactions at 750 °C for 30 min to 130 μm for reactions at 1000 °C for 90 min. At 1200 °C, only a PRZ was observed (i.e. the thickness of the MIRZ was nominally zero), suggesting that the dissolution reaction within the pores/cracks and subsequent formation of reaction products may limit infiltration. Fifty-hour heat-treatments at 1000 °C and 1200 °C prior to reaction with the V2O5 at 800 °C for 90 min were used to change the microstructural features of the coating, such as crack connectivity and pore size. The heat-treatment at 1000 °C was found most deleterious to the coating due to large cracks created via a desintering process that afforded deep penetration of the molten V2O5." @default.
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• W2022081625 date "2009-06-01" @default.
• W2022081625 modified "2023-10-16" @default.
• W2022081625 title "Degradation of plasma-sprayed yttria-stabilized zirconia coatings via ingress of vanadium oxide" @default.
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• W2022081625 doi "https://doi.org/10.1016/j.jeurceramsoc.2008.10.003" @default.
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