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High entropy alloy bond coats for thermal barrier coatings: a review

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1007/s11666-023-01701-3
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Affiliation
  1. National Research Council of Canada. Automotive and Surface Transportation
FormatText, Article
Subjectbond coat; high entropy alloys; mechanical properties; thermal barrier coatings; thermal spray
Abstract
Thermal barrier coatings (TBCs) are commonly employed as thermal protection systems in harsh environments and are comprised of a ceramic top coat and a metallic bond coat. The traditional materials used for bond coats are MCrAlX alloys, where M represents metals or alloys (such as Ni, Co, or NiCo), and X represents reactive elements like Y, Hf, Ta, and Si. In high-temperature environments, high-entropy alloys (HEAs) have exhibited considerable potential as viable alternatives to bond coat materials, owing to their remarkable mechanical strength, thermal stability, and oxidation resistance. The distinctive compositional characteristics of HEAs can augment bond coat hot corrosion resistance by facilitating the formation of a thermally grown oxide (TGO) characterized by enhanced continuity, density, and uniformity, attributed to the synergistic effects arising from their unique alloying elements. Moreover, HEAs can modulate diffusion phenomena at the interface between the bond coat and substrate, particularly under elevated temperature conditions. This manuscript explores the thermodynamic, mechanical, and microstructural behavior of HEAs, as well as, the selection and application of HEAs as bond coats in comparison to conventional bond coats.
Publication date
PublisherSpringer
ASM International
Licence
  • Copyright 2023 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, no. 2-3 (March 2024): 430–446.
LanguageEnglish
Peer reviewedYes
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Record identifier242c15b1-bcba-4876-a4fa-2686d3ee91ce
Record created2024-03-21
Record modified2024-05-02
Date modified: