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Heat Transfer Through Nanoscale Multilayered Thermal Barrier Coatings at Elevated Temperatures

Published

Author(s)

Daniel Josell, Thao M. Nguyen, John E. Bonevich

Abstract

Heat transfer through thermal barrier coatings (TBCs) composed of alternating nanometer thick layers of aluminum oxide and 7% yttria stabilized zirconia (7YSZ) was studied by pulsed heating at temperatures in the range 1000 °C to 1100 °C. The thermal diffusivity of the TBCs, deposited on thin metal foils by electron beam evaporation and coated with an opaque, submicrometer metal layer, was studied by applying a sub-s duration heating pulse from a Q-switched laser to the substrate and then monitoring the temperature rise on the opposing, coated surface of the TBC. The recorded temperature transients were modeled using properties of the constituent materials with different values of interface thermal resistance. The results yield an upper bound of the interface thermal resistance, determining the feasibility of using interfaces in this materials system to improve TBC performance by decreasing thermal conductivity.
Citation
Surface and Coatings Technology
Volume
275

Citation

Josell, D. , Nguyen, T. and Bonevich, J. (2015), Heat Transfer Through Nanoscale Multilayered Thermal Barrier Coatings at Elevated Temperatures, Surface and Coatings Technology, [online], https://doi.org/10.1016/j.surfcoat.2015.05.036 (Accessed May 24, 2022)
Created August 15, 2015, Updated November 10, 2018