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Influence of microstructure on the erosion behaviour of suspension plasma sprayed thermal barrier coatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
GKN Aerospace Engine Systems, Trollhättan, Sweden.ORCID iD: 0000-0003-1897-0171
Innovnano materials, Coimbra, Portugal.
University of Hyderabad, Hyderabad, India.
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 375, p. 86-99Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBCs) are applied on the surface of hot parts of gas turbine engines to increase the turbine efficiency by providing thermal insulation and to protect the engine parts from the harsh environment. Typical degradation of TBCs can be attributed to bond coat oxidation, thermal stress etc. In addition to this, erosion can also lead to partial or complete removal of the TBCs especially when the engine operates under erosive environment such as flying over desert area, near active volcanic or offshore ocean environment. Suspension Plasma Spraying (SPS) is a promising technique for TBC applications by virtue of its ability to produce a strain-tolerant porous-columnar microstructure that combines the benefits of both electron beam physical vapor deposited (EB-PVD) as well as atmospheric plasma sprayed (APS) coatings. This work investigates the influence of various coating microstructures produced by SPS on their erosion behavior. Six different coatings with varied microstructures produced using different suspensions with distinct characteristics were studied and their erosion resistance was compared. Results showed significant influence of SPS TBCs microstructures on the erosion resistance. Furthermore, the erosion resistance of SPS TBCs showed a close correlation between fracture toughness and the erosion rate, higher fracture toughness favours superior erosion resistance. © 2019 Elsevier B.V.

Place, publisher, year, edition, pages
2019. Vol. 375, p. 86-99
Keywords [en]
Engines; Erosion; Fracture toughness; Microstructure; Offshore oil well production; Plasma jets; Porosity; Silicon compounds; Sprayed coatings; Thermal barrier coatings; Thermal insulation, Atmospheric plasmas; Coating microstructures; Columnar microstructures; Physical vapor deposited; Plasma-sprayed thermal barrier coating; Suspension plasma spraying; Thermal barrier coating (TBCs); Turbine efficiency, Plasma spraying
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14462DOI: 10.1016/j.surfcoat.2019.06.075ISI: 000488409900010Scopus ID: 2-s2.0-85068658494OAI: oai:DiVA.org:hv-14462DiVA, id: diva2:1356369
Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-16

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Algenaid, WaelGanvir, AshishJoshi, Shrikant V.

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