Abstract
Yttria-stabilized zirconia (YSZ) coatings with typical pyramid columnar and dense layered structure were prepared by plasma spray-physical vapor deposition (PS-PVD). The evolution behavior of microstructure and crystallography of the coatings before and after thermal aging treatment were observed by electron backscatter diffraction (EBSD) and field emission scanning electron microscopy (FE-SEM). Results showed that the as-deposited coatings exhibited many types of structures and were mainly composed of a nonequilibrium tetragonal (t’-ZrO2) phase. With the prolonging of thermal exposure time, the initial nonequilibrium tetragonal phase of YSZ coatings gradually transformed into a monoclinic (m-ZrO2) phase. During the process of stationary deposition, at a proper spraying distance, each column exhibited a certain preferred orientation, but the ceramic topcoat did not exhibit distinct preferred orientation statistically.
Highlights
The deposition of thermal barrier coatings (TBCs) on the surface of hot-section end components of engines can improve the inlet temperature of gas, improving the efficiency and extending the lifetime of heat engines [1,2,3]
By studying the evolution law of microstructure and crystal texture of two typical coatings at high temperature, the experimental basis is provided for exploring the relationship between deposition characteristics and high temperature stability of thermal barrier coatings, and providing experimental basis for engineering application of plasma spray-physical vapor deposition (PS-PVD) TBCs
The Yttria-stabilized zirconia (YSZ) material reaching the surface of the substrate mainly existed in the form of a liquid phase, and contained a small amount of vapored-phase clusters and solid particles
Summary
The deposition of thermal barrier coatings (TBCs) on the surface of hot-section end components of engines can improve the inlet temperature of gas, improving the efficiency and extending the lifetime of heat engines [1,2,3]. Some powder particles are not injected into the center of the flame, the temperature of plasma flame is much higher than melting point of ZrO2 , so the powder can be vaporized well This is conducive to the full heating of the spray particles, and can flow through the shadow area of the twin vanes like components with complex shape along with the plasma jet, so as to realize the rapid, uniform and non-line of sight deposition of the coating on the surface of the Crystals 2020, 10, 826; doi:10.3390/cryst10090826 www.mdpi.com/journal/crystals. By studying the evolution law of microstructure and crystal texture of two typical coatings at high temperature, the experimental basis is provided for exploring the relationship between deposition characteristics and high temperature stability of thermal barrier coatings, and providing experimental basis for engineering application of PS-PVD TBCs
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