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Thermal conductivity and phase evolution of plasma-sprayed multilayer coatings

Su, Y. Jennifer and Wang, Hsin and Porter, Wally D. and de Arellano Lopez, A. R. and Faber, K. T. (2001) Thermal conductivity and phase evolution of plasma-sprayed multilayer coatings. Journal of Materials Science, 36 (14). pp. 3511-3518. ISSN 0022-2461. https://resolver.caltech.edu/CaltechAUTHORS:20140908-181322406

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Abstract

Multilayer coatings were prepared using small-particle plasma spray to investigate the effect of interfaces on thermal conductivity and phase stability. Monolithic and multilayer alumina and yttria partially-stabilized zirconia coatings, with 0, 3, 20, and 40 interfaces in 200–380 μm thick coatings were studied. Thermal conductivity was determined for the temperature range 25 °C to 1200 °C using the laser flash method and differential scanning calorimetry. Thermal conductivity of the multilayer coatings was accurately modeled by a series heat transfer equation, indicating that interfacial resistance plays a negligible role in heat transfer in the direction perpendicular to the coating plane. Powder X-ray diffraction results indicate that identical phase transitions occur in all the coatings. Independent of coating microstructure (i.e. layer thickness), as-sprayed γ-Al_2O_3 transforms to α-Al_2O_3 after 100 hours at 1200°C; as-sprayed metastable t′–ZrO_2 converts to a mixture of t–ZrO_2 and c–ZrO_2 after 100 hours at 1300 °C. Thus, the results indicate that the interfaces do not aid in stabilizing the as-sprayed phases after prolonged severe heat treatments.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1023/A:1017932617123DOIArticle
http://link.springer.com/article/10.1023%2FA%3A1017932617123PublisherArticle
Additional Information:© 2001 Kluwer. Received 4 April and accepted 27 November 2000. The authors wish to thank Rick Marzec of the Advanced Coatings Technology Group at Northwestern University for his assistance in fabricating the coatings. This work was supported by the U.S. Department of Energy, Federal Energy Technology Center, Cooperative Agreement No. DE-FC21-92MC29061, under subcontract 96-01-SR047. The thermal conductivity testing was supported by U.S. DOE, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the HTML User Program under contract DE-AC05-96OR22464, managed by Lockheed Martin Energy Research Corporation.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC21-92MC29061
Department of Energy (DOE)DE-AC05-96OR22464
Issue or Number:14
Record Number:CaltechAUTHORS:20140908-181322406
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140908-181322406
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49390
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Sep 2014 17:52
Last Modified:03 Oct 2019 07:13

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