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- Title
Microstructure–Thermal Conductivity Relationships for Plasma-Sprayed Yttria-Stabilized Zirconia Coatings.
- Authors
Weiguang Chi; Sampath, Sanjay; Hsin Wang
- Abstract
The microstructures of plasma-sprayed yttria-stabilized zirconia (YSZ) coatings are complex, contributing to challenges in establishing microstructure–thermal conductivity relationships. Furthermore, the dynamic evolution of microstructure and properties during service offers a significant challenge in defining design strategies and extended coating performance. In this paper, the relationship between microstructure and thermal conductivity is investigated for three sets of plasma-sprayed YSZ coating systems prepared using different morphology powders, different particle size distributions, and controlled modification of particle states through plasma torch parameters. Both ambient and temperature-dependent thermal conductivity were conducted in the as-sprayed and thermally aged states. The results suggest that a range of thermal conductivities can be achieved from the coatings, offering potential for microstructural tailoring for desired performance. The results also demonstrate that different as-deposited microstructures display varying propensity for sintering and these attributes need to be considered in the design and manufacturing cycle. This expansive study of a range of coatings has also allowed synthesis of the results through thermal conductivity–porosity maps and has allowed elucidation of the contributing microstructural components for both the ambient and high-temperature thermal conductivity. Considering that the operating thermal transport mechanisms are different at these two temperature extremes, such mapping strategies are of value to both science and technology.
- Subjects
MICROSTRUCTURE; THERMAL conductivity; SURFACE coatings; ZIRCONIUM oxide; TEMPERATURE; SPRAYING; SINTER (Metallurgy); POWDER metallurgy; COATINGS industry
- Publication
Journal of the American Ceramic Society, 2008, Vol 91, Issue 8, p2636
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2008.02476.x