Due to different preparation processes, the microstructure of thermal barrier coatings can be varied. It is important to accurately calculate effective thermal conductivity for the design of thermal barrier. In this work, different microstructures of thermal barrier coatings were reconstructed using the four parameter stochastic growth method. The numerical calculation program was developed and used to analyze the heat conduction in composite materials at steady state. The performance of the coating with the layered, columnar and uniform structure was analyzed in detail. The results show the porosity of thermal barrier coating has a great influence on the thermal conductivity. The thermal conductivity reduces with increased coating porosity. Keeping the porosity constant, the pore diameter has no significant influence on the thermal conductivity of the coating. The thermal conductivity of layered structure with the porosity of 15% is 46% lower than that of columnar structure at this temperature.
- International Gas Turbine Institute
Analysis of Effective Thermal Conductivity of Thermal Barrier Coatings Based on Microstructure
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Wang, Y, Wang, X, & Weng, Y. "Analysis of Effective Thermal Conductivity of Thermal Barrier Coatings Based on Microstructure." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy. Düsseldorf, Germany. June 16–20, 2014. V006T22A015. ASME. https://doi.org/10.1115/GT2014-26751
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