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Fatigue Performance of TBCs on Hastelloy X Substrate During Cyclic Bending
Institute of Plasma Physics AS CR, Department of Materials Engineering, v.v.i..
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic.
Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic.
Institute of Plasma Physics AS CR, Department of Materials Engineering, v.v.i..
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2016 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, no 1-2, 231-243 p.Article in journal (Refereed) Published
Abstract [en]

Our previous experiments with low-cost steel substrates confirmed that individual steps of conventional thermal barrier coating (TBC) deposition may influence fatigue properties of the coated samples differently. In the presented study, testing was carried out for TBC samples deposited on industrially more relevant Hastelloy X substrates. Samples were tested after each step of the TBC deposition process: as-received (non-coated), grit-blasted, bond-coated (NiCoCrAlY), and bond-coated + top-coated yttria-stabilized zirconia (YSZ). Conventional atmospheric plasma spraying (APS) was used for deposition of bond coat and top coat. In addition, for one half of the samples, dual-layer bond coat was prepared by combination of high-velocity air-fuel (HVAF) and APS processes. Samples were tested in the as-sprayed condition and after 100 hours annealing at 980 °C, which simulated application-relevant in-service conditions. Obtained results showed that each stage of the TBC manufacturing process as well as the simulated in-service heat exposure may significantly influence the fatigue properties of the TBC coated part. HVAF grit-blasting substantially increased the fatigue performance of the uncoated substrates. This beneficial effect was suppressed by deposition of APS bond coat but not by deposition of dual-layer HVAF + APS bond coat. All heat-treated samples showed again enhanced fatigue performance. © 2015 ASM International

Place, publisher, year, edition, pages
2016. Vol. 25, no 1-2, 231-243 p.
Keyword [en]
Air, Coatings, Deposition, Fatigue of materials, Plasma jets, Plasma spraying, Substrates, Thermal barrier coatings, Yttrium alloys, Zirconia, Atmospheric plasma spray, Failure mechanism, HVAF, NiCoCrAlY, Thermal barrier coating (TBCs), Yttria-stabilized zirconias (YSZ), Yttria stabilized zirconia
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-8710DOI: 10.1007/s11666-015-0321-4ISI: 00374268000024Scopus ID: 2-s2.0-84953639179OAI: oai:DiVA.org:hv-8710DiVA: diva2:875470
Available from: 2015-12-01 Created: 2015-11-24 Last updated: 2016-12-16Bibliographically approved

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Nicholas, CurryBjörklund, Stefan
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