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Influence of YSZ layer thickness on the durability of gadolinium zirconate/YSZ double-layered thermal barrier coatings produced by suspension plasma spray
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2475-9284
Treibacher Industrie AG, Austria.
Linköping University, Department of Management and Engineering, Linköping, Sweden.
Linköping University, Department of Management and Engineering, Linköping, Sweden.
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 357, p. 456-465Article in journal (Refereed) Published
Abstract [en]

In this work, three double layered thermal barrier coating (TBC) variations with different gadolinium zirconate (GZ) and YSZ thickness (400GZ/100YSZ, 250GZ/250YSZ and 100GZ/400YSZ respectively, where the prefixed numbers before GZ and YSZ represent the layer thickness in μm), were produced by suspension plasma spray (SPS) process. The objective was to investigate the influence of YSZ thickness on the thermal conductivity and thermal shock lifetime of the GZ/YSZ double layered TBCs. The as sprayed TBCs were characterized using SEM, XRD and porosity measurements. Thermal diffusivity measurements were made using laser flash analysis and the thermal conductivity of the TBCs was calculated. The double layered TBC with the lowest YSZ (400GZ/100YSZ) thickness showed lower thermal diffusivity and thermal conductivity. The double layered TBCs were subjected to thermal shock test at a TBC surface temperature of 1350 °C. Results indicate that the TBC with a higher YSZ thickness (100GZ/400YSZ) showed inferior thermal shock lifetime whereas the TBCs with low YSZ thickness showed comparatively higher thermal shock lifetimes. Failure of the TBCs after thermal shock test was analyzed using SEM and XRD to gain further insights.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 357, p. 456-465
Keywords [en]
Gadolinium; Plasma jets; Plasma spraying; Thermal conductivity; Thermal shock; X ray diffraction; Yttria stabilized zirconia; Yttrium oxide; Zirconia, Diffusivity measurements; Double layered; Gadolinium zirconate; Layer thickness; Porosity measurement; Surface temperatures; Suspension plasma sprays; Thermal barrier coating (TBC), Thermal barrier coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-13106DOI: 10.1016/j.surfcoat.2018.10.046ISI: 000455691100067Scopus ID: 2-s2.0-85055204877OAI: oai:DiVA.org:hv-13106DiVA, id: diva2:1261400
Funder
Knowledge Foundation, 20140130Available from: 2018-11-07 Created: 2018-11-07 Last updated: 2019-02-04Bibliographically approved

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Mahade, SatyapalMarkocsan, NicolaieNylén, Per

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