환경차폐코팅용 이터븀 실리케이트의 고온 수증기부식 거동
Corrosion Behavior of Ytterbium Silicates in Water Vapor Atmosphere at High Temperature for Environmental Barrier Coating Applications
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초록
SiC/SiCf CMC is vulnerable to water vapor corrosion at a high temperature of 1500℃. So, EBC (Environmental Barrier Coating) materials are required to protect Si-based CMCs. Ytterbium silicates are reported to coefficient of thermal expansion (CTE) similar to that of the based material, such as SiC/SiCf CMC. When the EBC materials expose to high temperature environment, the interface between ytterbium silicates and SiC/SiCf CMC is not separated, and the coating purpose can be safely achieved. For the perspective of EBC applications, thermally grown oxide (TGO) layer with different CTE is formed by the reaction with water vapor in EBC, which leads to a decrease in life time. In this study, we prepare the two types of ytterbium silicates to observe the corrosion behavior during the expose to high temperature and water vapor. In order to observe this behavior, the steam-jet furnace is prepared. In addition, phase formation of these ytterbium silicates is analyzed with microstructures by the before/after steam-jet evaluation at 1500℃ for 100 h.
Abstract
SiC/SiCf CMC is vulnerable to water vapor corrosion at a high temperature of 1500℃. So, EBC (Environmental Barrier Coating) materials are required to protect Si-based CMCs. Ytterbium silicates are reported to coefficient of thermal expansion (CTE) similar to that of the based material, such as SiC/SiCf CMC. When the EBC materials expose to high temperature environment, the interface between ytterbium silicates and SiC/SiCf CMC is not separated, and the coating purpose can be safely achieved. For the perspective of EBC applications, thermally grown oxide (TGO) layer with different CTE is formed by the reaction with water vapor in EBC, which leads to a decrease in life time. In this study, we prepare the two types of ytterbium silicates to observe the corrosion behavior during the expose to high temperature and water vapor. In order to observe this behavior, the steam-jet furnace is prepared. In addition, phase formation of these ytterbium silicates is analyzed with microstructures by the before/after steam-jet evaluation at 1500℃ for 100 h.
참고문헌 (15)
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