Abstract
In this study, eutectic Y3Al5O12/Al2O3 coatings with alternating YAG and Al2O3 phases are successfully prepared using atmospheric plasma spray (APS) technique. Through subjecting the coatings to heat treatments within temperatures ranging from 1000 °C to 1500 °C, it becomes possible to tailor the microstructures of the coatings, including phase distribution, porosity level, grain sizes, and interphase spacing. Furthermore, an investigation into the crystallization behavior of YAG and Al2O3 phases, as well as the formation mechanism of eutectic-like microstructure in YAG/Al2O3 coatings, reveals that YAG phases undergo primary crystallization from the amorphous phase, followed by secondary crystallization of Al2O3 phases between YAG crystals. This work provides insights into understanding the relationship between heat treatment temperatures and coating morphologies, as well as elucidates the formation mechanism of eutectic-like microstructure, thereby guiding the controlled preparation of YAG/Al2O3 coatings via APS technique.
Published Version
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