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Deposition of electrically conductive zirconium monoxide via plasma spray-physical vapor deposition

Harder, Bryan J. and Good, Brian and Schmitt, Michael and Kowalski, Ben and Koszegi, Giacomo and Johnson, Matthew T. and Faber, Katherine T. (2022) Deposition of electrically conductive zirconium monoxide via plasma spray-physical vapor deposition. Journal of the American Ceramic Society, 105 (5). pp. 3568-3580. ISSN 0002-7820. doi:10.1111/jace.18309. https://resolver.caltech.edu/CaltechAUTHORS:20220121-733841000

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Abstract

A condensed phase of zirconium monoxide (ZrO) was detected in YSZ (Zr_(0.92)Y_(0.08)O_(2-δ)) coatings deposited using plasma spray-physical vapor deposition. The rapid cooling rate of this process can result in the condensation of nonequilibrium states that can be kinetically trapped in the coatings. The columnar microstructure contained a mixture of YSZ, ZrO2, and ZrO phases. The ZrO phase was expected to be conductive based on density functional theory calculations, and preliminary impedance measurements were performed that supported this prediction. When heated in an oxygen-containing environment, the ZrO phase remains in the coating until ∼450 K, at which point it disappears quickly, as confirmed by X-ray diffraction and thermogravimetric methods. The loss of ZrO in the coating was also linked to a loss in electrical conductivity. However, it was shown that this phase can persist at elevated temperatures of ∼1000 K in vacuum or inert environments for at least 100 h.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/jace.18309DOIArticle
ORCID:
AuthorORCID
Harder, Bryan J.0000-0002-5304-5267
Schmitt, Michael0000-0003-0922-3975
Kowalski, Ben0000-0001-9324-1628
Johnson, Matthew T.0000-0002-3710-1070
Faber, Katherine T.0000-0001-6585-2536
Additional Information:© 2022 American Ceramic Society. This article has been contributed to by US Government employees and their work is in the public domain in the USA. Issue Online: 09 March 2022; Version of Record online: 21 January 2022; Accepted manuscript online: 03 January 2022; Manuscript accepted: 11 December 2021; Manuscript revised: 10 December 2021; Manuscript received: 27 August 2021. The authors would like to thank Rick Rogers for assistance with the X-ray diffraction, Pete Bonacuse for help in analyzing the optical spectrometry data, and Alp Sehirlioglu for discussions regarding the impedance data. Giacomo Koszegi was supported by a Caltech Summer Undergraduate Research Fellowship. This work was supported under the NASA Aeronautics Research Mission Directorate's Transformational Tools and Technologies Project as part of the Transformative Aeronautics Concepts Program. The authors declare that they have no conflict of interest.
Funders:
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
NASAUNSPECIFIED
Subject Keywords:coatings; electrical conductivity; heat treatment; zirconia: yttria-stabilized
Issue or Number:5
DOI:10.1111/jace.18309
Record Number:CaltechAUTHORS:20220121-733841000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220121-733841000
Official Citation:Harder, BJ, Good, B, Schmitt, M, Kowalski, B, Koszegi, G, Johnson, MT, et al. Deposition of electrically conductive zirconium monoxide via plasma spray-physical vapor deposition. J Am Ceram Soc. 2022; 105: 3568–3580. https://doi.org/10.1111/jace.18309
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113042
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:21 Jan 2022 22:21
Last Modified:23 Mar 2022 22:35

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