Constrained sintering and thermal ageing behaviour of electrophoretically deposited Yb2Si2O7 environmental barrier coating

Esma Yilmaz, Ahmet Hilmi Paksoy, Grant Gibson, Ping Xiao (Corresponding)

Research output: Contribution to journalArticlepeer-review

Abstract

The oxidation of SiC and the formation of a thermally grown oxide layer (TGO) limit the lifetime of environmental barrier coatings. Thus, this paper focuses on the deposition of denser Yb2Si2O7 coatings using electrophoretic deposition to reduce the TGO growth rate. The findings showed densification for Yb2Si2O7 can be achieved with an optimized sintering profile (heating/cooling rate, temperature, and time). However, the addition of 1.5 wt% of Al2O3 to Yb2Si2O7 promoted densification and lowered the required sintering temperature, 1380 °C using 2 °C/min heating/cooling rate for 10 h provided efficient coating density. Moreover, adding Al2O3 reduced the TGO growth rate by more than 70 % compared to the Al2O3-free coatings, without cracking in TGO after 150 h of thermal ageing at 1350 °C. Results within this study suggest electrophoretic deposition with Al2O3 addition produces promising Yb2Si2O7 environmental barrier coatings on SiC substrate with low oxidation rates and increased lifetime.
Original languageEnglish
Pages (from-to)6427-6439
Number of pages13
JournalJournal of the European Ceramic Society
Volume43
Issue number14
Early online date12 Jun 2023
DOIs
Publication statusPublished - 1 Nov 2023

Keywords

  • Constrained sintering
  • Electrophoretic deposition
  • Environmental barrier coating
  • TGO
  • Thermal ageing

Fingerprint

Dive into the research topics of 'Constrained sintering and thermal ageing behaviour of electrophoretically deposited Yb2Si2O7 environmental barrier coating'. Together they form a unique fingerprint.

Cite this