Abstract
Lu2Si2O7 nanostructured environmental barrier coating was prepared using as–synthetic Lu2Si2O7 feedstock via atmospheric plasma spraying. The structure and mechanical performances of Lu2Si2O7 coatings were characterized in detail. Results indicate that nanostructured Lu2Si2O7 coating exhibits a bi-modal microstructure, lamella structure and unmelted particles. The phase components of nanostructured Lu2Si2O7 coatings consist of β-Lu2Si2O7 and a small number of X2-Lu2SiO5. Furthermore, the nanohardness and elastic modulus of Lu2Si2O7 coatings have the characterization of bi-modal properties via Weibull analysis, i.e., the large Weibull modulus and the small Weibull modulus represent molten lamella structure and unmelted particles, respectively. Meanwhile, the fracture toughness of nanostructured Lu2Si2O7 coatings is superior to conventional Lu2Si2O7 coatings, and the adhesion strength of Lu2Si2O7 coatings is about 22.6 MPa by pull-extend test. Results of research are helpful for the design and preparation of advanced thermal spray coating.
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