|About this Abstract
||Materials Science & Technology 2020
||Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
||Anisotropy at Interfaces in Rare-earth Pyrosilicates for High-temperature Coatings
||Hadas Sternlicht, Nitin Padture
|On-Site Speaker (Planned)
Environmental barrier coatings (EBCs) are used to protect ceramic matrix composites (CMCs) used in the hot section of gas turbine engines against oxidation, and have to be resistant to attack of calcia-magnesia-alumino-silicate (CMAS) glass from the atmosphere, which can lead to premature failure of the coatings. In this work electron microscopy characterization of the anisotropy in the CMAS- EBCs reaction will be discussed, focusing on grain boundaries and phase boundaries. The presence of line defects, such as disconnections (which can have both a step and a dislocation component) will be discussed in light of the interaction with the glass. In addition, the chemistry of phase boundaries will be partially evaluated. The tendency of such phase boundaries to be located along different grain boundaries will be discussed, as well as how the interaction with the glass affects it.