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Modeling flow-based electrophoretic deposition for functionally graded materials
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DOI：10.1016/j.matdes.2021.110000.png)
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Abstract
En 中文
Electrophoretic deposition is an industrially proven technique to create materials from colloidal suspen-sions using an electric field, including functionally graded materials. While typically the composition of the colloidal suspension is held constant during deposition, leading to deposits of uniform composition or distinct layers, several researchers have reported forming functionally graded materials via elec-trophoretic deposition by changing the composition during the deposition. This article explores elec-trophoretic deposition in a flow cell that allows arbitrary gradients in the deposited material to be formed by actively mixing two colloidal suspensions during deposition. Under certain combinations of flow rate and applied electric field, the morphology of the deposit strongly deviates from the desired uni-form thickness to a distinct wedge shape. To understand this phenomenon and leverage it for improved designs, a multiphysics model is developed that describes the spatial-temporal colloidal transport of par-ticles in the suspension and reveals that suspension flow rate is the key factor influencing deposit mor-phologies observed in the experiment. Crucially, a distinct transition is found in deposit morphology from wedge shaped to flat at a dimensionless electric Froude number of approximately 10. (c) 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords:
Electrophoretic deposition
Flow cell
Numerical modelling
Functionally graded materials
Ceramics
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