1. A thermodynamic study of the influence of the Al2O3 content on the CaO-SiO2-YO1.5 system.
- Author
-
Bonnal, J., Mermoul, S., Petitjean, C., Panteix, P.J., Bonina, D., Gendarme, C., Arnal, S., and Vilasi, M.
- Subjects
- *
ALUMINUM oxide , *RARE earth metals , *TURBINE blades , *AIRPLANE motors , *TERNARY system - Abstract
In aircraft engines applications, the interactions between rare earth silicates (mainly yttrium silicates) used as Environmental Barrier Coatings (EBCs) on turbine blades and liquid calcium-magnesium-aluminosilicates (CMAS) due to the particles ingested by the engines may lead to severe damages at high temperature. Due to the large range of composition of CMAS, simplified model systems must be used to have a good comprehension of the thermochemical phenomena leading to degradation. The interaction between ceramics and CMAS can lead to the precipitation of phases as apatite Ca 2 Y 8 (SiO 4) 6 O 2 and cyclosilicate Ca 3 Y 2 (Si 3 O 9) 2 which might provide protection to the EBC. However, their thermodynamic stability depends on many parameters. In the present work, the influence of alumina Al 2 O 3 addition to the ternary system CaO-SiO 2 -YO 1.5 has been studied in order to verify the equilibrium with the liquid field at 1300 °C. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF