Experiments and modeling of rapid solidification of plasma-sprayed yttria-stabilized zirconia |
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Authors: | H. Liu H.R. Salimi Jazi M. Bussmann J. Mostaghimi |
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Affiliation: | 1. Department of Mechanical and Industrial Engineering and Centre for Advanced Coating Technologies, University of Toronto, 5 King’s College Road, Toronto, ON, Canada M5S 3G8;2. Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran, 8415683111 |
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Abstract: | Thermal barrier coatings (TBCs) are widely used to increase the working temperature and improve the high-temperature corrosion resistance of base materials. Thermal spraying methods such as air plasma spraying (APS) are convenient techniques to deposit TBCs. This work examines the rapid solidification of APS-deposited yttria-stabilized zirconia (YSZ), by modeling the non-equilibrium solidification of a single molten particle. The model solves the so-called hyperbolic equations for heat and mass transfer to predict interface undercooling and velocity as a function of time, and also predicts the morphology of the solidification front (and thus the microstructural characteristics of rapidly solidified YSZ) as a function of interface velocity. Results are presented of a single particle solidifying onto a steel substrate, and onto a previously deposited particle. The numerical results are also compared to experimental data of the microstructure of a YSZ splat deposited by APS, to validate the model. |
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