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3668 |
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Optimization of porous YSZ high-temperature abradable coating deposited by surface-molten spherical powder through computational fluid dynamic analysis of gas and particle flow in flame spraying |
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Chang-Jiu Li* / Xi'an Jiaotong University, P.R. China Hui-Bin Huo / State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China Guan-Jun Yang/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China Jian-Tao Yao/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China |
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In this study, porous YSZ coating deposition was deposited by flame spraying of surface-molten particle to develop porous high temperature ceramic abradable coating. The commercially available YSZ powders were spheriodized by high temperature plasma jet and sieved to a narrow particle size range for control of spray particle melting state. The effects of spray distance and acetylene flow rate on the particle velocity and melting degree were investigated to examine the coating deposition behavior. The YSZ coating was deposited at different flame powers and spray distances. The porosity of the coating was estimated by image analyzing from cross section of the coating. In order to control and optimize the coating microstructure, the gas velocity and temperature field were analyzed by means of three-dimensional computational fluid dynamics (CFD) simulations. The results showed that the porous YSZ coating with a porosity up to 50% can be successfully deposited by controlling particle melting degree. The particle velocity estimated by the simulations is consistent well with experimental results. The influence of spray particle melting degree depending on spray distance and flame power on coating microstructure and porosity was examined. |