Heat Transfer Through Nanoscale Multilayered Thermal Barrier Coatings at Elevated Temperatures

Published

August 15, 2015

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

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.surfcoat.2015.05.036

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 April 25, 2024)