Water vapor corrosion resistance of a novel environmental barrier coating candidate (Yb0.2Y0.2Lu0.2Er0.2Sc0.2)2Si2O7

Improving water vapor corrosion resistance has become critical for environmental barrier coating materials to extend the life of ceramic matrix composites. A novel environmental barrier coating candidate (Yb0.2Y0.2Lu0.2Er0.2Sc0.2)2Si2O7((5RE1/5)2Si2O7) was synthesized in this study. The corrosion behavior of (5RE1/5)2Si2O7 in a water vapor environment at 1400 degrees C was observed and analyzed. The results show that (5RE1/5)2Si2O7 is a high-performance environmental barrier coating material against water vapor corrosion. Corrosion pores and transcrystalline cracks appeared on the surface of the material after 300 h of corrosion. The average thickness of the recession layer was about 5.66 mu m. The pyrosilicate phase still occupied 87.834 %. The mass loss rate of the material was about 0.0396 mg/cm2. The corrosion resistance is superior to the disclosed coating materials. This research provided a theoretical basis for optimizing the performance of environmental barrier coatings.