Phase Composition and Microstructural Responses of Graded Mullite/YSZ Coatings Under Water Vapor Environments

abstract

Mullite-based systems have been considered as environmental barrier coatings (EBCs) for high temperature protection of Si-based ceramic (Si(3)N(4), SiC) substrates against water vapor corrosion, for application in forthcoming turbine engines. Graded mullite/Y-ZrO(2) composites plasma sprayed over Hexoloy SiC substrates were analyzed as EBCs. All feedstock materials were purposely prepared and singular spraying conditions were used to assure superior crystallization. The different coated specimens were subjected to temperatures of 1300 A degrees C for 100-500 h under water vapor environment. The effect of water corrosion on the exposed coatings was investigated by focusing on their phase and microstructure changes.

keywords

BARRIER COATINGS; SIC/SIC COMPOSITES; SILICON-NITRIDE; BEHAVIOR; ZIRCON; CRYSTALLIZATION; TEMPERATURE; CERAMICS; EBC

subject category

Materials Science

authors

Garcia, E; Mesquita-Guimaraes, J; Miranzo, P; Osendi, MI; Cojocaru, CV; Wang, Y; Moreau, C; Lima, RS

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