|About this Abstract
||Materials Science & Technology 2019
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||Thermal Conductivity Reduction in 7 wt% Yttria Doped Zirconia Nanocrystalline Ceramics
||John W Drazin, James A Wollmershauser, Stephanie Wimmer, Brian F Donovan, Edward Gorzkowski
|On-Site Speaker (Planned)
Thermal Barrier Coatings (TBCs) are an integral component of the thermal protection system in high temperature turbine engines made primarily out of 7 wt% yttria-doped zirconia (7YSZ). With future fuel efficiency requirements, the temperature of these engines will likely be increased requiring lower thermal conductivity in the TBCs to protect the metal substrate. Theoretical approaches predict that a nanocrystalline grain size can retard the thermal conductivity without hindering the mechanical properties. Therefore, in this work, we manufactures fully dense 7YSZ nanocrystalline ceramics, sub- 50 nm grains, and measured the thermal conductivity which was lowered by over 16% at room temperature. In addition, various sized polymer spheres were added to the YSZ compacts to be burned out producing pores in the final microstructure. The thermal conductivity was further reduced. This microstructure – property relationship was also successfully modeled using FEM code in both 2D and 3D.
||Definite: At-meeting proceedings