NDLI: Effect of heat treatment on the thermal conductivity of plasma-sprayed thermal barrier coatings

Content Provider	Springer Nature Link
Author	Dutton, Rollie Wheeler, Robert Ravichandran, K. S. An, K.
Copyright Year	2000
Abstract	The effect of heat treatment on the thermal conductivity of plasma-sprayed Y$_{2}$O$_{3}$ stabilized ZrO$_{2}$ (YSZ) and Al$_{2}$O$_{3}$ coatings was investigated. A heat treatment of 1300 °C in flowing argon for 50 h was found to significantly increase the thermal conductivity of the coatings when compared to measurements in the assprayed condition. Transmission electron microscopy (TEM) examination of the microstructures of the coatings in the as-sprayed and heat-treated conditions revealed that sintering of microcracks at the splat interfaces was the main cause for the increase in thermal conductivity. In the YSZ coatings, complete closure of microcracks was frequently observed. In contrast, microcrack closure in the Al$_{2}$O$_{3}$ coatings was characterized by the isolated necking of particles across a microcrack rather than complete closure. A model for thermal conductivity in a solid containing oriented penny-shaped cracks was used to explain the observed increase in thermal conductivity after heat treatment.
Starting Page	204
Ending Page	209
Page Count	6
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	9
Issue Number	2
e-ISSN	15441016
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	thermal conductivity heat treatment microcracks TBCs Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Materials Science Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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