| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Phase Stability of Co-substituted Rare Earth Disilicate Systems for Environmental Barrier Coatings |
| Author(s) |
Christine Brockman, V. V. Rohit Bukka, Clinton Switzer, Amjad 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 material oxidation and recession in extreme environments. Rare earth (RE) disilicates have been used as an EBC top coat layer to slow the degradation of the underlying EBC layers. Y2Si2O7 is a promising material for EBCs, but the presence of polymorphs at high temperatures limits its usage. A method to stabilize Y2Si2O7 has been investigated, through the co-substitution with another RE material, scandium. In this study, results from our investigations on the effect of the addition of Sc2Si2O7 from 0-40 mol% on the thermal properties of Y2Si2O7 will be presented. Powder samples of Y2Si2O7 and Sc2Si2O7 were synthesized using the steric entrapment method. X-ray diffraction was used to study the change in lattice parameters and phase transformation properties as a function of composition and temperature. |