Splat Formation of Plasma Sprayed Functionally Graded YSZ/NiCrCoAlY Thermal Barrier Coatings

Zhuang Ma; Fang Ji Zhou; Su Hong Cao; Fu Chi Wang; Qun Bo Fan

doi:10.4028/www.scientific.net/KEM.368-372.1862

Paper Titles

Dynamic Observation of Fracture Process in a Silicon Carbide- Matrix Laminated Ceramic Composite
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Preparation of Ternary Layered Ti₃SiC₂ Ceramic by SHS/PHIP
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Fabrication and Mechanical Properties of B₄C/BN Laminated Ceramics
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Joining CoSb₃ to Metal Surface of FGM Electrode for Thermoelectric Modules by SPS
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Splat Formation of Plasma Sprayed Functionally Graded YSZ/NiCrCoAlY Thermal Barrier Coatings
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Preparation and Characterization of Multilayered Mullite/Mo Functionally Gradient Materials
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Preparation of Mg-W Graded Materials by Spark Plasma Sintering
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Cladding of WC-Cr₃C₂ Cermet Coating by Laser Controlled Reactive Synthesis
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Microstructure and Mechanical Properties of Graded Materials Prepared by Field-Activated and Pressure-Assisted Combustion Synthesis
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Splat Formation of Plasma Sprayed Functionally Graded YSZ/NiCrCoAlY Thermal Barrier Coatings

Abstract:

Splat morphologies of YSZ/NiCrCoAlY TBCs by plasma spray were characterized using SEM. Based on some assumptions, plasma jet temperature field was established by numerical simulation and the effects of spray parameters are individually studied to optimize the spray process parameters. Furthermore, the interaction wetting ability was taken into account in order to investigate the interaction effect between ZrO2 and NiCrCoAlY droplets. It shows that T enhances markedly with increasing in I and decreasing in FAr; while in despite of the insignificant effect of FHe on T, the temperature of powder in plasma jet enhances with increasing in FHe. As a result of higher thermal conductivity of powder in He plasma gas. NiCrCoAlY droplet impacting solidified NiCrCoAlY splat wets well and spreads fluently while that impacts solidified YSZ splat spreads restrictedly for the poor wetting on the YSZ splat surface.