Phase equilibria in the zirconia–yttria/gadolinia–silica systems

Najeb M. Abdul-Jabbar, David L. Poerschke, Cian Gabbett, Carlos G. Levi

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Phase equilibria in ZrO2-YO1.5-SiO2 (ZYS) and ZrO2-GdO1.5-SiO2 (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO2-YO1.5/GdO1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO2-YO1.5 or ZrO2-GdO1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.

Original languageEnglish (US)
Pages (from-to)3286-3296
Number of pages11
JournalJournal of the European Ceramic Society
Issue number9
StatePublished - Aug 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd


  • Phase diagrams
  • Phase equilibria
  • Rare earth zirconates
  • Silicates
  • Thermal barrier coatings


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