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Meeting MS&T22: Materials Science & Technology
Symposium High Temperature Oxidation of Metals and Ceramics
Presentation Title Thermochemical Stability of High Entropy Rare Earth Oxide (HERO) Coatings for Refractory Alloys
Author(s) Kristyn Diane Ardrey, Elizabeth Opila, Patrick Hopkins, Bicheng Zhou, Prasanna Balachandran
On-Site Speaker (Planned) Kristyn Diane Ardrey
Abstract Scope High entropy rare earth oxide (HERO) coatings are under investigation for application on Nb-base alloys to increase operating temperatures in aircraft turbine engines. Nb-base alloys are the most formable of the refractory alloys, but they lack the ability to form a protective oxide layer, making an environmental barrier coating essential. Potential coating candidates for use in a combustion environment are rare earth oxides. Rare earth oxides have a similar thermal expansion with Nb-base alloys and provide thermochemical stability in a combustion environment, giving them the ability to act as an environmental barrier coating (EBC). Furthermore, with the high entropy approach, thermal conductivity may be reduced by mixing multiple rare earth oxides into a single HERO coating, providing dual thermal/environmental barrier coating capability. This presentation will focus on the effect of HERO coating composition on thermochemical stability in turbine environments and interactions with the underlying Nb-base alloy during high temperature exposures.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Computational Investigation of the Early Stages of Degradation of High Entropy Alloy Surfaces
Advanced Characterization of Hot Stress Corrosion Cracking in CMSX-4 Turbine Blade Alloys Using Deep Learning-assisted 3D X-ray Microscopy to Reveal High Temperature Fracture and Crack Arrest Mechanisms
Alumina-scale Establishment Behavior on Ni-6Al-yCr-2X (y = 4, 6, 8; X = Nb, Ta, Re) Model Alloys during High-temperature Oxidation
Alumina Forming MAX Phases: Current Status and Future Perspectives
Analysis and Simulation of Alkoxide Corrosion Occurring in Automotive Metals with Biofuels
Atomic Scale Dynamics of Initial Stage Copper Oxidation Using In Situ ETEM and Correlated DFT Simulations
Burst Behavior and Oxidation Resistance of Cr-coated Zircaloy-4 Accident Tolerant Fuel Cladding
Design of Ultra-high Temperature Ceramics for Oxidation Resistance
Effect of Pressure on High-temperature Corrosion of Ni Alloys in Supercritical CO2 Containing Impurities
Effects of Secondary Additions to Na2SO4 Deposits on High-Temperature Hot Corrosion
Environmentally Assisted Cracking of Nickel and Iron Based Alloys in Te-containing Molten Salts
Evaluating the Oxidation Behavior of 1300C Capable Nb-Si-based Alloys
Factors Affecting Deposit-Induced Corrosion of Aero-Turbine Components at Elevated Temperatures
Failure Behavior Analysis of Thermal Barrier Coatings under Adverse Environment: Analytical and Numerical Modeling
G-2; Oxidation Behaviour of Ultra-high Temperature Polymer-derived Ceramic-matrix Composites
GE's Accident Tolerant Fuel Cladding: An Overview of Accident Scenario Testing
High-temperature High-velocity Water Vapor Exposures of Ytterbium-silicate Dual-phase Mixture Compositions
High-temperature Oxidation-resistant Mechanism of Refractory High Entropy Alloy
High Temperature Oxidation Behavior of Equimolar NbTiZr
High Temperature Oxidation Behavior of Fe- and Ni-Based Alloys Fabricated by Additive Manufacturing
High Temperature Oxidation Behavior of Ta vs TaC
Investigating Fifth Oxide Effect on CMXAS Glass Properties
Investigation of High Emittance, Oxidation Resistant Multi-Layer Coatings for Carbon/Carbon Composites for Hypersonic Application
Material Compatibility in Supercritical CO2 at 450°-650°C
Materials Compatibility of Automotive Alloys in Synthetic Fuels - Test Method Development to Evaluate the Corrosion Behavior of Aluminum Materials in Oxygenates(OMEs)
Microstructure, High Temperature Oxidation and Mechanical Properties of Fe-Cr-Ni-Al Medium Entropy Alloy
Mo-Si-B Coatings for Protection of SiC-based Materials in High Temperature Active Oxidation Environments
New Approaches to Study Oxygen Transport in SiC-based Ceramic Matrix Composites
Obtaining Surface Coatings Providing Protection Against High Temperatures in the Production of Coke
Oxidation and Erosion Implications of CMAS on Environmental Barrier Coatings
Rare-earth Monosilicate Interactions with Calcium-magnesium Aluminosilicate
Study of the Pre-oxidation Effect on Long-term Oxidation Properties of Porous Fe22Cr Alloy
The Effect of Pressure on the Oxidation of Steels in Direct-fired Supercritical CO2 Power Cycle Environments
Thermal Expansion Analysis of Mixed and High Entropy Rare Earth Disilicates via Synchrotron X-ray Scattering
Thermochemical Stability of High Entropy Rare Earth Oxide (HERO) Coatings for Refractory Alloys
Understanding Mixed Sulfate-oxide Induced Hot Corrosion of Alumina-forming Alloys

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