Analysis of Erosion Behavior of Yb2Si2O7 Environmental Barrier Coatings Under High-Temperature CMAS Conditions
Environmental barrier coatings (EBCs) represent a novel generation of protective coatings for the aerospace engine hot end components,which are susceptible to erosion from calcium magnesium aluminum silicon (CMAS) deposits at high temperatures. The molten CMAS penetrates the coating interior,introducing additional internal stresses that lead to spalling. However,the underlying mechanism of CMAS wetting and penetration on EBC surfaces under thermal shock conditions remains unclear. This study utilizes plasma spraying to fabricate Yb2Si2O7 environmental barrier coatings,investigating the wetting behavior of CMAS on surfaces with varying roughness as well as the penetration behavior of CMAS within different pore structures. The findings demonstrate that roughness influences the wetting behavior of CMAS on Yb2Si2O7 coating surfaces,with higher roughness promoting a more dominant longitudinal driving force for CMAS. Moreover,pore structure affects the CMAS penetration of the Yb2Si2O7 coating interior regions,with higher porosity resulting in faster penetration rates. This investigation will support the mitigation of CMAS erosion in Yb2Si2O7 environmental barrier coatings.
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