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Impact of impurity content on the sintering resistance of dysprosia and yttria stabilised zirconia thermal barrier coatings
University West, Department of Engineering Science, Division of Mechanical Engineering. (PTW)ORCID iD: 0000-0003-0209-1332
University of Mancheste.
University West, Department of Engineering Science, Division of Production Engineering. (PTW)ORCID iD: 0000-0002-9578-4076
2013 (English)In: Proceedings of the International Thermal Spray Conference / [ed] Editor: Rogerio S. Lima, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Georg Mauer, André McDonald, and Filofteia-Laura, ASM International, 2013, 557-563 p.Conference paper, Published paper (Refereed)
Abstract [en]

Dysprosia stabilised zirconia (DySZ) is a promising candidate to replace yttria stabilised zirconia (YSZ) as a thermal barrier coating due to its lower inherent thermal conductivity. It is also suggested in studies that DySZ may show greater stability to high temperature phase changes compared to YSZ, possibly allowing for coatings with extended lifetimes. Separately, the impurity content of YSZ powders has been proven to influence high temperature sintering behaviour. By lowering the impurity oxides within the spray powder, a coating more resistant to sintering can be produced. This study presents both high purity and standard purity dysprosia and yttria stabilised zirconia coatings and their performance after a long heat treatment. Coatings were produced using powder with the same morphology and grain size; only the dopant and impurity content were varied. Samples have been heat treated for exposure times up to 400 hours at a temperature of 1150°C. Samples were subsequently measured for thermal conductivity to plot the evolution of coating thermal properties with respect to exposure time. Thermal conductivity has been compared to microstructure analysis and porosity measurement to track structural changes due to sintering.

Place, publisher, year, edition, pages
ASM International, 2013. 557-563 p.
National Category
Materials Engineering Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6732Scopus ID: 2-s2.0-84907064770ISBN: 978-163266681-9 (print)OAI: oai:DiVA.org:hv-6732DiVA: diva2:751610
Conference
International Thermal Spray Conference and Exposition: Innovative Coating Solutions for the Global Economy, ITSC 2013; Busan; South Korea; 13 May 2013 through 15 May 2013; Code 107529
Available from: 2014-10-01 Created: 2014-10-01 Last updated: 2016-02-11Bibliographically approved

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CiteExportLink to record
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