|About this Abstract
||MS&T23: Materials Science & Technology
||High Temperature Corrosion and Degradation of Structural Materials
||Discovery of High Entropy Rare Earth Disilicates for Extreme Environments
||Laura Ann Doumaux, Milena Milich, Hunter Schonfeld, Mackenzie Ridley, Davide Robba, Luka Vlahovic, Kostantinos Boboridis, Elizabeth Opila, Patrick Hopkins
|On-Site Speaker (Planned)
||Laura Ann Doumaux
Rare-earth silicate environmental barrier coatings are the current industry standard for application of SiC-based ceramic matrix composite components in hot sections of jet engines. Rare-earth disilicate coatings are desirable due to their increased stability with water vapor, thermal stability, and compatible elastic moduli and coefficients of thermal expansion with the SiC substrate. By considering all available rare-earth elements, high entropy compositions can be created to stabilize phases and suppress lattice thermal conductivity without compromising other properties. However, the effect on melting temperature is unknown. Sintered pellets of these high entropy compositions were melted with an IR laser where the heated region was monitored by a pyrometer and spectro-pyrometer for measurements of thermal effects. These high entropy compositions were characterized after melting to determine any changes in phases present and resulting microstructure by using scanning electron microscopy, energy dispersive spectrometry, and microfocus x-ray diffraction.