Abstract
Tri-layer Si/mullite/Yb2SiO5 environmental barrier coating (EBC) was prepared on the SiCf/SiC ceramic matrix composite (CMC) by plasma spray-physical vapor deposition (PS-PVD). The EBC samples were carried out with water vapor corrosion at 1300 °C for 200 h. After steam corrosion, Yb2SiO5 layer forms a gradient porous structure. This is mainly due to the inclusion of SiO2-rich layer which is precipitated from the gasification inside the coating and existing a small amount of Yb2O3 separately. During the corrosion process, water vapor infiltrates into the coating and reacts with the SiO2 and Yb2O3 to generate volatile substances. This forms a porous structure to make the coating brittle, resulting in mud cracks finally. In addition, the results show that the Yb2SiO5 can react with the water vapor at the coating surface, forming an Yb2Si2O7 top layer.
Highlights
The high-performance aero-engines are developing in the direction of high thrust-weight ratio, high bypass ratio and high engine efficiency, which means the turbine inlet temperature will continue to rise [1]
A tri-layer Si/Mullite/Yb2 SiO5 environmental barrier coating system was prepared on the SiCf/Silicon carbide (SiC) ceramic matrix composite (CMC) substrate by plasma spray-physical vapor deposition which is a novel coating on the SiCf/SiC CMC substrate by plasma spray-physical vapor deposition which is a novel coating preparation technology
This can be divided threeinto steps—firstly, under the impact of carrier the ytterbium aggregated process can be into divided three steps—firstly, under the impactgas, of carrier gas, thesilicate ytterbium silicate powder waspowder dispersed into micro nanoparticles; the lattice distortion occurs under the combined aggregated was dispersed into micro nanoparticles; the lattice distortion occurs under action of high temperature plasma beam and ultra-low pressure
Summary
The high-performance aero-engines are developing in the direction of high thrust-weight ratio, high bypass ratio and high engine efficiency, which means the turbine inlet temperature will continue to rise [1]. Silicon carbide (SiC) fiber-reinforced SiC ceramic matrix composite (SiCf/SiC CMC) has the advantages of low density, high strength and high temperature resistance [3,4] It is considered as an alternative material for thermal components of the generation turbine engines. Rare earth silicates (e.g., Yb, Er, Y, Lu) with good high temperature stability and good resistance to water vapor corrosion are considered to be the most potential EBC materials [11,12,13]. A tri-layer Si/Mullite/Yb2 SiO5 environmental barrier coating system was prepared on the SiCf/SiC CMC substrate by plasma spray-physical vapor deposition which is a novel coating on the SiCf/SiC CMC substrate by plasma spray-physical vapor deposition which is a novel coating preparation technology.
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