|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||251 Thermal Gradient Cycling with Simultaneous Silicate Particle Deposition onto Advanced Air Plasma Sprayed Thermal Barrier Coatings
||Julie Drexler, Andrew Gledhill, Kentaro Shinoda, Sanjay Sampath, Nitin Padture
|On-Site Speaker (Planned)
Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are currently used in jet engines, allowing for higher operating temperatures, and greater efficiency. However, increasing temperatures make engines more susceptible to attack by ingested airborne sand particles that melt and form calcium-magnesium-aluminosilicate (CMAS) glass, which can lead to loss of strain tolerance and subsequent TBC failure. New air plasma sprayed TBCs containing Al2O3 and TiO2 in solid solution in YSZ have been shown to mitigate CMAS attack by partial penetration followed by crystallization of the glass. Understanding how these partially penetrated TBCs would fare in jet engines is currently limited. To better simulate jet engine-like conditions, thermal gradient cycling was performed on a burner rig and compared to mechanical models. Results from isothermal and thermal gradient cycling of conventional YSZ and CMAS-resistant coatings with and without applied CMAS will be presented.