|About this Abstract
||Materials Science & Technology 2019
||Sandphobic Thermal/Environmental Barrier Coatings
||CMAS-Resistant YSZ-Rare Earth Oxide Composite Coatings
||Clara Mock, Michael Walock, Anindya Ghoshal, Muthuvel Murugan, Marc Pepi
|On-Site Speaker (Planned)
Military rotorcraft and aircraft are susceptible to environmental damage from airborne particulates in austere environments. Particulates entering the hot section of the engine melt, impinge on components, and solidify as calcia-magnesia-alumina-silicate (CMAS) glasses. Damage occurs primarily by: 1) CMAS accumulation on turbine blades resulting in clogged air pathways and significant power loss, 2) CMAS infiltration into component thermal barrier coatings (TBC) resulting in reduced engine lifetime and TBC spallation. The proposed TBC uses a composite approach to incorporate the favorable mechanical properties of the current state-of-the-art, yttria stabilized zirconia (YSZ), with CMAS-resistant rare earth-based oxides (REO). Coatings were produced via air plasma spray and tested in engine-simulated environments with synthetic sand. Coatings were characterized with optical and electron microscopies and mechanical properties measured via indentation hardness. Preliminary results show that mixing REOs with YSZ can significantly reduce molten sand adhesion and buildup of glassy CMAS deposits compared to pure YSZ.