ProgramMaster Logo
Conference Tools for MS&T23: Materials Science & Technology
Register as a New User
Submit An Abstract
Propose A Symposium
Presenter/Author Tools
Organizer/Editor Tools
About this Abstract
Meeting MS&T23: Materials Science & Technology
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Progress on Phase Stability of Substituted Rare Earth Disilicate Compositions for Environmental Barrier Coatings
Author(s) Christine Brockman, V. V. Rohit Bukka, Amjad S. Almansour, Pankaj Sarin
On-Site Speaker (Planned) Christine Brockman
Abstract Scope Environmental barrier coatings (EBCs) enable the use of ceramic matrix composites (CMCs) in turbine engine components by protecting the CMC from oxidation and recession in extreme environments. Rare earth (RE) disilicates have been used as an EBC topcoat layer to slow the degradation of underlying EBC layers. Y2Si2O7 is a promising material, but the presence of polymorphs at high temperatures limits its usage. A method to stabilize Y2Si2O7 has been investigated, through the substitution with another RE material, scandium. Compositions of (YxSc1-x)2Si2O7 systems with increasing Sc content at the RE site were synthesized at 1100°C. X-ray diffraction (XRD) was used to confirm the α-phase of Y2Si2O7, and β-phase for each (YxSc1-x)2Si2O7 system (6, 13, 21 mol% Sc) after synthesis. Results from high temperature XRD will be presented to elucidate the phase stability, phase transformation and anisotropic thermal expansion properties of each (YxSc1-x)2Si2O7 system as a function of composition and temperature.


Computational Study of Site-disordered AgSbI4
Crystal Structure Solution and Phase Transformations of CaZr4(PO4)6 and SrZr4(PO4)6
Effect of Cations Decoration on Ti3C2Tx MXene, its Stability and Phase Transformation at High Temperatures
Elevated Temperature Phase Control of Two-dimensional Mo2TiC2Tx Carbide Through Defect Engineering
Enhancing Oxidation Resistance of Silicon Nitride Using Ca2+ Stabilizer
Microstructural Evolution and Associated Kinetics of Seeded Solid State Single Crystal Growth of CoTi2O5
Phase Stability and Cation Partitioning in Multi-rare Earth Aluminates and Zirconates
Phase Transformations in Ceramic Materials under Extreme External Forcing
Progress on Phase Stability of Substituted Rare Earth Disilicate Compositions for Environmental Barrier Coatings
Spinodal Decomposition in Ferroelectric Crystals
Structural Evolution of MgAl2O4 and NiAl2O4 Disordered Spinel Oxides Studied via In Situ Neutron Total Scattering
Using Total Scattering Techniques to Explore Fundamental Aspects of the Structural Organization in Weberite-type Tantalate Oxides

Questions about ProgramMaster? Contact