Abstract
Chemical reaction between (Y0.8Gd0.2)3Al5O12 (GYAG) and calcium-magnesium- alumina-silicate (CMAS) with four different compositions was investigated. The GYAG revealed excellent chemical stability with molten CMAS even after 24 h heat-treatment at 1250 °C. A GYAG layer was sprayed onto an yttria stabilized zirconia (YSZ) thermal barrier coating (TBC) by plasma spray and the thermal cycling behavior and resistance to CMAS corrosion of the coating system were researched. The GYAG/YSZ TBC system exhibited a lifetime of more than 1500 h during thermal cycling testing at 1100 °C. Also, the GYAG/YSZ TBC has shown good resistance to CMAS corrosion at 1250 °C, mainly due to the chemical stability of GYAG to CMAS and dense lamellar structure of the GYAG layer. In addition, the infiltration of CMAS was further prohibited by the Ca4Y6(SiO4)6O and CaAl2Si2O8 phases generated from the reaction of (Y,Gd)AlO3 phase in the coating with the molten CMAS.
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