About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
High-Temperature Corrosion and Degradation of Materials
|
| Presentation Title |
Quantitative Analysis and 3D Structure of High-Temperature Steam-Induced Porosity in Rare-Earth Disilicates for Environmental Barrier Coating Applications |
| Author(s) |
Marcus C. Lam, Chathuranga S. Witharamange, Elizabeth J. Opila |
| On-Site Speaker (Planned) |
Marcus C. Lam |
| Abstract Scope |
Silicon carbide (SiC)-based ceramic matrix composites (CMCs) offer enhanced gas turbine performance but impose stringent requirements on environmental barrier coating (EBC) materials, particularly under high-temperature conditions. Rare-earth disilicates (REDS) are promising EBC candidates due to their chemical and thermal expansion compatibilities with SiC, yet are prone to steam-induced degradation in combustion environments. Steam exposure transforms REDS into monosilicates, inducing specific volume changes with accompanying porosity that facilitates deeper ingress of reactive species. In this study, pore volume fraction, morphologies and structures were examined in depth using machine learning (ML)-assisted image analysis and three-dimensional reconstructions from focused ion beam (FIB) sectioning. Knudsen diameters along the reaction depth and three-dimensional tortuosity values of pore networks are reported for the first time, providing critical parameters for modeling high-temperature REDS recession kinetics and guiding the design of more durable EBC systems. |