Date of Award
5-2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical and Civil Engineering
First Advisor
Pei-Feng Hsu
Second Advisor
Hector Gutierrez
Third Advisor
Ming Zhang
Fourth Advisor
Kegang Wang
Abstract
An analytical model of the thermal conductivity of the porous yttrium-stabilized zirconia (YSZ) layer used in the thermal barrier coatings (TBCs) is presented. Such high-temperature resistant coatings are essential to protect the metallic components of gas turbine engines. The model calculates the conductivity based on the coating's porosity, pore size distribution, and pore morphology, including the individual pore cross-section area, aspect ratio, and orientation, which are extracted from the scanning electron microscopy images. The model was verified through comparisons with numerical simulation results from a multiphysics software tool. A laser temperature gradient test was performed to validate the analytical model further. Overall, the study provides insight into the factors affecting the thermal conductivity of porous YSZ coatings and presents an analytical method to predict the property based on the coating's microstructure. The information is critical for the design of TBC systems and thermal performance evaluation during the service of such systems.
Recommended Citation
Zhao, Lei, "Thermal Conductivity of Thin Porous Ceramic Coatings: An Analytical and Experimental Study" (2024). Theses and Dissertations. 1457.
https://repository.fit.edu/etd/1457