|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Multilayered, Multifunctional Thermal Barrier Coatings for Gas Turbine Engines
||Sanjay Sampath, Vaishak Vishwanathan, Gopal Dwivedi
|On-Site Speaker (Planned)
Thermal barrier coatings (TBCs) are increasingly playing a vital role in enhancing efficiency and performance of gas turbine engines. As engine operating temperatures rise, yttria-stabilized zirconia (YSZ), the currentTBC, has reached its operational limits. Gadolinium Zirconate (GDZ)-based pyrochlores are now emerging contenders, as they offer low conductivity and resist attack by silicate deposits. However, GDZ cannot be directly substituted for YSZ due to its incompatibility with the thermally grown alumina layer, requiring multilayer strategies. In this study several multilayer architectures, based on both YSZ and the YSZ–GDZ system,have been developed and tested for durability under furnace thermal cycling conditions. Coating designs considered optimization of microstructure and properties of individual layers based on their location within the top-coat thickness to address competing interests of thermal conductivity, compliance, and resistance to silicates. The results point to new strategies in the design and manufacturing of optimal multilayer coatings.
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