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Low-Thermal-Conductivity Plasma-Sprayed Thermal Barrier Coatings With Engineered Microstructures

Published

Author(s)

Amol Jadhav, N P. Padture, Eric Jordan, Maurice Gell, Pilar Miranzo, Lin-Sien H. Lum

Abstract

The solution precursor plasma spray (SPPS) process has been used to deposit ZrO2-7wt%Y2O3 (7YSZ) thermal barrier coatings (TBCs) that contain alternate layers of low and high porosities (layered-SPPS). The thermal conductivity of the layered-SPPS coating is found to be lower than those of both, a SPPS coating with distributed porosity and a air-plasma-sprayed (APS) coating of the same composition, in the temperature range 100-1000 degrees C. Analytical and object-oriented finite element (OOF) models have been used to analyze the experimental thermal conductivity data. Although the calculated thermal conductivities from both analytical and OOF models compare with the respective experimentally measured thermal conductivities, OOF captures accurately the effect of real microstructures on the thermal conductivities of these plasma-sprayed TBC's.
Citation
Acta Materialia

Keywords

microstructure, object oriented finite element, porosity, solution precursor plasma spray, thermal barrier coating, thermal conductivity, zirconia

Citation

Jadhav, A. , Padture, N. , Jordan, E. , Gell, M. , Miranzo, P. and Lum, L. (2017), Low-Thermal-Conductivity Plasma-Sprayed Thermal Barrier Coatings With Engineered Microstructures, Acta Materialia (Accessed April 19, 2024)
Created February 19, 2017