Hot corrosion behavior of Y3Al5O12/LaPO4 materials exposed to molten V2O5.

The current study reports the fabrication of (1- x) Y 3 Al 5 O 12 / x LaPO 4 (x = 0, 0.1, 0.2, 0.3, 0.4) composites and their evaluation against molten V 2 O 5 corrosion at 900 °C and 1000 °C for 20 h. The phase compositions and microstructures of the samples were analysed using X-ray diffraction (XRD) spectroscopy, as well as scanning electron microscopy (SEM), both before and after the corrosion tests. The yttrium aluminium garnet (Y 3 Al 5 O 12 , YAG) was easily corroded by molten V 2 O 5 , with the primary product being YVO 4. While LaPO 4 exhibited perfect resistance to the molten V 2 O 5 corrosion, it was ineffective at improving the corrosion resistance of the YAG/LaPO 4 composite materials. However, the LaPO 4 /YAG double layers materials prepared with LaPO 4 coated on the surface of YAG exhibit excellent resistance to molten V 2 O 5 , owing to the formation of the P diffusion layer at the interface between the LaPO 4 and YAG, which acts as a sealing layer, preventing the molten V 2 O 5 from penetrating. [ABSTRACT FROM AUTHOR]