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High entropy oxides as promising materials for thermal barrier topcoats: a review

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1007/s11666-024-01744-0
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Affiliation
  1. National Research Council of Canada. Automotive and Surface Transportation
FormatText, Article
Subjecthigh entropy oxides; thermal barrier coatings; thermal spray; topcoat
Abstract
Multi-layered thermal barrier coatings (TBCs) are deposited on gas turbine metallic components to protect them against high temperatures, oxidation, and corrosion. However, TBCs have limited working temperatures and lifetimes due to their material properties. Several approaches are tested to increase TBC topcoats' phase stability and properties. Increasing entropy to stabilize phases is a concept introduced in 2004 and required decreasing the Gibbs free energy. Many high entropy ceramics are developed for structural and functional applications, and different types of high entropy oxides (HEOs) are promising TBC ceramics due to their unique characteristics. HEOs are single-phase solid solutions that contain five or more cations, usually a mixture of transition metals and rare-earth elements. Due to the cocktail effect, the final material has a different behavior from its constituents, making it a viable method to improve the properties of traditional materials. Generally, high entropy materials are characterized by three additional phenomena: sluggish diffusion, severe lattice distortion, and high entropy. A review of possible improvements in the lifetime of TBC topcoats using different HEOs in terms of their composition, properties, and stability is presented here. Different HEOs are then examined, and various thermophysical properties, high-temperature stability, and sintering resistance are discussed.
Publication date
PublisherSpringer
ASM International
Licence
  • Copyright 2024 ASM International. This paper was published in the Journal of Thermal Spray Technology and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
In
  • Journal of Thermal Spray Technology 33 (4 March 2024): 447–470.
LanguageEnglish
Peer reviewedYes
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Record identifierfa126c6d-7df8-49e2-b2f8-37acfbd8ac32
Record created2024-03-21
Record modified2024-10-16
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