Coating deposition regularity depended on orientation difference in PS-PVD plasma jet |
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Institution: | The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651, China |
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Abstract: | The YSZ coatings are prepared by the plasma spray-physical vapor deposition (PS-PVD) technology based on a specific experimental design. The structure, thickness and growth angle of YSZ coatings on the entire circumferential surface of the cylindrical sample are studied. The results indicated that the structure, thickness and deflection growth angle of YSZ coatings are related to the orientation of deposition location. The numerical simulation of the multiphase mixed fluid near the substrate is carried out and the deposition regularity and mechanism of YSZ coatings prepared by PS-PVD is deduced. The growth rate is related to the local characteristics of the plasma flow field, and is directly proportional to the field pressure and inversely proportional to the field velocity. The growth angle of the coating is generally affected by the flow direction of the plasma jet. Especially, the normal component of velocity vector, Vnorm, mainly affects the speed at which the coating grows vertically upwards. The tangential component of velocity vector, Vtan, determines the degree that the coating growth direction deviates from the vertical direction. When Vtan ≠ 0, the coating forms a fine column with a certain deflection angle and finally develops into an oblique columnar structure. |
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Keywords: | Deposition mechanism Flow field characteristic Numerical simulation Orientation difference Plasma spray – physical vapor deposition YSZ coating |
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