Abstract
Thermal diffusivities of air plasma sprayed (APS) thermal barrier coatings (TBCs) were measured by the laser flash method. The data were used to calculate thermal conductivity of TBCs when provided with density and specific heat data. Due to the complicated microstructure and other processing-related parameters, thermal diffusivity of TBCs can vary as much as three- to four-fold. Data collected from over 200 free-standing ZrO 2-7-8wt.%Y 2O 3 TBCs are presented. The large database gives a clear picture of the expected "band" of thermal diffusivity values. When this band is used as a reference for thermal diffusivity of a specific TBC, the thermal transport property of the TBC can be more precisely described. This database is intended to serve researchers and manufacturers of TBCs as a valuable resource for the evaluation of TBCs.
Original language | English |
---|---|
Pages (from-to) | 879-883 |
Number of pages | 5 |
Journal | Journal of Thermal Spray Technology |
Volume | 19 |
Issue number | 5 |
DOIs | |
State | Published - Sep 2010 |
Funding
The authors would like to thank all the HTML users in the past 12 years for allowing this database to be developed. Users contributed to the thermal diffusivity database include GE Aircraft Engine, GE CR&D, Northwestern University, Siemens Westinghouse, Solar Turbine, Purdue University, University of Central Florida, Pennsylvania State University, and State University of New York at Stony Brook. This work has been sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program at Oak Ridge National Laboratory by the UT-Battelle LLC, for the Department of Energy under contract DE-AC05000OR22725.
Keywords
- TBC
- ZrO
- laser flash
- plasma spray
- thermal diffusivity