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Microstructures and Thermal Cycling Properties of Thermal Barrier Coatings Deposited by Hybrid Water-Stabilized Plasma Torch
Department of Materials Engineering, Institute of Plasma Physics CAS, v.v.i, Prague, Czechia.
Department of Materials Engineering, Institute of Plasma Physics CAS, v.v.i, Prague, Czechia.
Department of Materials Engineering, Institute of Plasma Physics CAS, v.v.i, Prague, Czechia.
Department of Materials Engineering, Institute of Plasma Physics CAS, v.v.i, Prague, Czechia.
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2020 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 29, no 3, p. 444-461Article in journal (Refereed) Published
Abstract [en]

Hybrid water-stabilized plasma (WSP-H) torches provide high-enthalpy plasma which may be utilized for high-throughput and yet economical spraying of coatings from powders, suspensions, and solutions. It was previously demonstrated that microstructures and functional properties of the WSP-H coatings may be tailored to a wide extent for new applications, namely those requiring high coating thickness and/or coating of large components. In this study, applicability potential of WSP-H technology for spraying of novel thermal barrier coatings (TBCs) is demonstrated. WSP-H technology was used for spraying of yttria-stabilized zirconia (YSZ) top-coats from powder, suspension, and solution. Yttria content in the top-coat feedstock was 7-8 wt.%. In addition, gadolinium zirconate (Gd2Zr2O7-GZO) was sprayed from suspension for comparison. NiCrAlY bond-coat was also deposited by WSP-H, and Hastelloy-X alloy was used as substrate material. Microstructure, phase composition, and endurance of the deposited coatings in thermal cycling fatigue (TCF) test and during high-temperature short-term annealing were evaluated. All coatings showed excellent high-temperature stability and TCF resistance withstanding more than 650 cycles, surpassing some of the currently commercially used TBCs. Lifetime of the TBC with columnar top-coat deposited from YSZ suspension exceeded even more than 900 cycles.

Place, publisher, year, edition, pages
2020. Vol. 29, no 3, p. 444-461
Keywords [en]
Microstructures, plasma, coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14986DOI: 10.1007/s11666-020-00990-2ISI: 000514810600010Scopus ID: 2-s2.0-85079518332OAI: oai:DiVA.org:hv-14986DiVA, id: diva2:1395763
Conference
e 2019International Thermal Spray Conference, held on May 26-29, 2019, inYokohama, Japan,
Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-03-09Bibliographically approved

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Gupta, Mohit Kumar

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