Quantifying the efficiency of reactions between silicate melts and rare earth aluminate-zirconate T/EBC materials

Eeshani P. Godbole, Nethmi Hewage, Anette von der Handt, David L. Poerschke

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The durability of thermal and environmental barrier coatings (T/EBCs) exposed to molten calcium magnesium aluminosilicate (CMAS) deposits depends on the nature of reactions between the coatings and deposits. These reactions consume the melt, and the crystallization products can block porosity that otherwise facilitates melt infiltration. The ideal reactions rapidly crystallize the melt with a small amount of dissolved T/EBC. This work compares the relative efficiency of reaction products reported in the literature to those formed on four prospective T/EBC materials based on multi-phase combinations of Gd- or Y-zirconates with GdAlO3, YAlO3, Gd4Al2O9, or Y4Al2O9. The results show that adding the aluminates to the zirconate materials promotes Gd- or Y-based aluminosilicates garnet and cuspidine crystallization, in addition to apatite. These phases effectively crystallize the melt, but the reaction efficiency is reduced compared to reactions with single phase zirconates. The implications for integration of these multiphase materials into T/EBC architectures are discussed.

Original languageEnglish (US)
Pages (from-to)5626-5635
Number of pages10
JournalJournal of the European Ceramic Society
Issue number13
StatePublished - Oct 2023

Bibliographical note

Funding Information:
This research was supported by the NASA award number 80NSSC21C0071 monitored by Dr. Cameron Bodenschatz, in collaboration with QuesTek Innovations LLC . N.H. was supported by the NSF REU program under Award Number DMR-1852044 and through the University of Minnesota MRSEC under Award Number DMR-2011401 . Part of this work was carried out in the Characterization Facility at the University of Minnesota , which receives partial support from the NSF through the MRSEC ( DMR-2011401 ) and the NNCI ( ECCS-2025124 ) programs. The sponsors were not involved in the detailed study design, or the data collection, analysis, or interpretation. The authors are grateful to Drs. Noriaki Arai, Pin Lu, and Jiadong Gong (QuesTek Innovations LLC) for the insightful discussions.

Publisher Copyright:
© 2023 Elsevier Ltd


  • Apatite
  • CMAS
  • Fluorite
  • Garnet
  • T/EBCs

MRSEC Support

  • Shared


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