Effect of High-Temperature Aging on the Thermal Conductivity of Nanocrystalline Tetragonal Yttria-stabilized Zirconia

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Effect of High-Temperature Aging on the Thermal Conductivity of Nanocrystalline Tetragonal Yttria-stabilized Zirconia

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dc.contributor.author Clarke, David R.
dc.contributor.author Limarga, Andi M.
dc.contributor.author Shian, Samuel
dc.contributor.author Baram, Mor
dc.date.accessioned 2012-11-08T18:18:49Z
dc.date.issued 2012
dc.identifier.citation Limarga, Andi M., Samuel Shian, Mor Baram, and David R. Clarke. 2011. Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia. Acta Materialia 60(15): 5417–5424. en_US
dc.identifier.issn 1359-6454 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:9887628
dc.description.abstract The thermal conductivity of yttria-stabilized zirconia (YSZ) thermal barrier coatings increases with high-temperature aging. This common observation has been attributed to the densification of the coatings as porosity sinters out and pores and cracks spheroidize to minimize their surface energy. We show that the thermalconductivity of fully-dense 3 mol. % Y\(_{2}\)O\(_{3}\) stabilized zirconia (3YSZ) also increases with high-temperature aging, indicating that densification and pore shape changes alone are not responsible for all the observed increase in thermalconductivity of coatings. Instead, there are also increases due to a combination of phase separation and grain growth. The increase in thermal conductivity can be described by a Larson–Miller parameter. It is also found that the increase in thermal conductivity with aging is greatest when measured at room temperature and decreases with increasing measurement temperature. Measured at 1000 °C, the thermal conductivity of zirconia is almost temperature independent and the changes in thermal conductivity with aging are less than 15%, even after aging for 50 h at 1400 °C. en_US
dc.description.sponsorship Physics en_US
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.relation.isversionof doi:10.1016/j.actamat.2012.06.054 en_US
dash.license OAP
dc.subject thermal conductivity en_US
dc.subject nanomaterials en_US
dc.subject yttria-stabilized zirconia en_US
dc.title Effect of High-Temperature Aging on the Thermal Conductivity of Nanocrystalline Tetragonal Yttria-stabilized Zirconia en_US
dc.type Journal Article en_US
dc.description.version Accepted Manuscript en_US
dc.relation.journal Acta Materialia en_US
dash.depositing.author Clarke, David R.
dc.date.available 2012-11-08T18:18:49Z

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  • FAS Scholarly Articles [7594]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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