Self-healing capacity of Mullite-Yb2SiO5 environmental barrier coating material with embedded Ti2AlC MAX phase particles

Title

Self-healing capacity of Mullite-Yb2SiO5 environmental barrier coating material with embedded Ti2AlC MAX phase particles

 Author

Lee, Gye Won (Kookmin University)
Kim, Tae Woo (Kookmin University)
Sloof, W.G. (TU Delft Team Kevin Rossi) ORCID 0000-0003-1443-0813
Lee, Kee Sung (Kookmin University)

Date

2021

 Abstract

Repetitive heating and cooling cycles inevitably cause crack damage of hot gas components of gas turbine engines, such as blades and vanes. In this study the self-healing capacity is investigated of mullite + ytterbium monosilicate (Yb2SiO5) as EBC material with Ti2AlC MAX phase particles embedded as a crack-healing agent. The effect of Ti2AlC in the EBC was compared with the self-healing ability of the mullite + Yb2SiO5 material. After introducing cracks by Vickers indentation on the surface of each sample, crack healing was realized by controlling the temperature and time during the post-heat-treatment process. For the mullite + Yb2SiO5 composite with Ti2AlC particles, crack healing occurred at 1000 °C, while in the case of the mullite + Yb2SiO5 composite without Ti2AlC, a sustained temperature of 1300 °C or higher was required. Compared with the healing of the mullite + Yb2SiO5 composite by the formation of a eutectic phase, the addition of Ti2AlC promoted healing via the oxidation of Ti and Al. Notably, the surface formation of a ternary oxide of Ti–Yb–O was confirmed, which completely covered the damage area. Consequently, the addition of a Ti2AlC MAX phase to the EBC composite resulted in a complete strength recovery, while the mullite + Yb2SiO5 composite without Ti2AlC showed a strength recovery of about 80%. Furthermore, by analyzing the indentation load–displacement curve to indicate the role of Ti2AlC, the addition of Ti2AlC improved both the hardness and stiffness of the composite.


 Subject

Crack healing
Environmental barrier coating
Mechanical properties
TiAlC

 To reference this document use:

http://resolver.tudelft.nl/uuid:8cdd6a85-a954-4e33-8d85-62031274eaca

 DOI

https://doi.org/10.1016/j.ceramint.2021.04.257

 Embargo date

2023-07-13

 ISSN

0272-8842

 Source

Ceramics International, 47 (16), 22478-22486

 Bibliographical note

Accepted Author Manuscript

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2021 Gye Won Lee, Tae Woo Kim, W.G. Sloof, Kee Sung Lee
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