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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Ceramic Materials and Processing
Presentation Title 3D Characterization and Quantitative Analysis of High-Temperature Steam-Induced Porosity in Rare-Earth Disilicates: Implications for Degradation Kinetics of Environmental Barrier Coatings
Author(s) Marcus C. Lam, Chathuranga S. Witharamage , Elizebath J Opila
On-Site Speaker (Planned) Marcus C. Lam
Abstract Scope Silicon carbide (SiC) ceramic matrix composites (CMCs) enable improved gas turbine efficiency but demand highly resilient environmental barrier coatings (EBCs) under extreme conditions. Rare-earth disilicates (REDS) are leading EBC candidates due to their chemical compatibility and matched thermal expansion with SiC. However, they remain vulnerable to steam-driven degradation at high temperatures. Steam exposure converts REDS to monocilicates, triggering specific volume contraction and generating porosity that accelerates oxygen and steam ingress. This work presents a detailed quantitative analysis of porosity evolution using machine learning-enhanced image segmentation and three-dimensional reconstructions from focused ion beam (FIB) tomography. Pore volume fraction, morphology, Knudsen diffusion diameters, and 3D tortuosity across reaction depths are reported. These parameters are directly linked to the kinetics of REDS recession and chemical degradation, providing valuable insights for predictive modeling and the development of more durable, oxidation-resistant EBC systems suitable for advanced turbine applications.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Surface Modification and Coatings, Ceramics

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