Abstract
Enhancing the resistance to molten silicate corrosion is crucial for the long service life of environmental barrier coatings (EBCs). In this study, we used the Al-modification technique to enhance the CMAS corrosion resistance of Si/Yb2Si2O7 coatings prepared by plasma spray-physical vapor deposition. The results show that the Al-modified Yb2Si2O7 coating had higher resistance to CMAS corrosion than the Yb2Si2O7 coating annealed at 1300 ℃ for 100 h, which is related to the refractory mullite and Yb2Mg(AlO2)2O3 generated during the CMAS exposure of Al-modified Yb2Si2O7 coating. The Al-modified Yb2Si2O7 coating also exhibited excellent resistance to oxygen penetration. The Al-modification technology provides the direction for the corrosion resistance of Yb2Si2O7 system to CMAS.
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