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Meeting MS&T25: Materials Science & Technology
Symposium High-Temperature Corrosion and Degradation of Materials
Presentation Title Evaluating Steam Stability of Xenotime-Inspired Rare Earth Orthophosphate Environmental Barrier Coatings
Author(s) Imoen Hawthorne, Elizabeth Opila
On-Site Speaker (Planned) Imoen Hawthorne
Abstract Scope Recent work has demonstrated promise for multicomponent rare earth disilicates (REDS) as environmental barrier coatings (EBC) for SiC-based composites. Synthesis of REDS requires separating RE from ores and recombining them for EBCs, creating a cost-prohibitive concept. Additionally, high-temperature steam exposure of REDS results in the formation of RE monosilicates leading to shorter lifespan due to cracking on cooling. RE-containing minerals offer opportunities for EBC use without costly separation of RE elements. Xenotime-based RE phosphates (REPO4), RE = (Y,Gd,Dy,Er,Yb), are a promising material class due to demonstrated improvements to several EBC requirements compared to REDS and being a commonly mined source of RE elements. Preliminary study of REPO4 indicates a reduction in parabolic rate of steam reaction through the production of highly stable RE2O3. Here results for reactivity of REPO4 in 1400°C high-velocity steam exposures for times up to 10 days are reported for individual Y,Nd,Gd,Dy,Er,Yb phosphates and multicomponent REPO4.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Design and performance testing of low-cost multicomponent rare earth disilicate environmental barrier coatings
Effects of Steam, Carbon Dioxide, and Oxygen Potential on the Early-Stage Oxidation Behavior of Ni-based Alloys
Erosion Resistant Effect on Engine Valvetrain Performance
Evaluating Steam Stability of Xenotime-Inspired Rare Earth Orthophosphate Environmental Barrier Coatings
Multi-Layered SiC-ZrB2 Coating Strategies to Improve Oxidation Durability of C/C Composites for High-Temperature Use
Optimizing Conditions for Environmental Barrier Coating Testing in High-temperature, High-velocity Steam Environments
Predicting Creep Deformation and Damage Using the Wilshire Cano Stewart (WCS) Model with Strain Energy Density (SED) for Alloy 617
Predicting Passivity of Refractory High Entropy Alloys
Quantitative Analysis and 3D Structure of High-Temperature Steam-Induced Porosity in Rare-Earth Disilicates for Environmental Barrier Coating Applications
Selective Oxidation of Sm in SmCo-based Magnets: Kinetics and Mechanisms
Steam Oxidation and Environmental Effects on Zr-Nb alloys

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