|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||228 Gradient Testing and Thermo-Mechanical Lifetime Modeling of Fly-Ash Infiltrated Thermal Barrier Coatings for Power-Generating Gas Turbines
||Andrew D. Gledhill, Julie Drexler, Kentaro Shinoda, Sanjay Sampath, Nitin P Padture
|On-Site Speaker (Planned)
||Andrew D. Gledhill
Thermal barrier coatings are used to protect metal component in gas turbine engines from the extreme temperatures and combustion environment. With the increasing cost of natural gas, power-generating turbines are looking towards synthetic gases, which have the potential of hosting numerous impurities. The effects of one such impurity, coal fly ash, are examined on conventional yttria-stabilized zirconia coatings, as well as gadolinium zironcate coatings in a thermal gradient burner rig. The time to spallation is measured for the coatings with and without ash impurity deposition, and the results are framed in the context of existing mechanical models. These models are then adapted to more accurately take into account the cyclic nature and time-dependent properties of the coatings and deposition. The result is a novel model that accurately predicts failure based on material properties, sintering rate, thermally grown oxide growth rate, and thermal history.