Effects of suspension properties on the fabrication of Yb2Si2O7 coatings using electrophoretic deposition |
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Affiliation: | 1. Department of Materials, University of Manchester, Manchester M13 9PL, United Kingdom;2. Henry Royce Institute, University of Manchester, Manchester M13 9PL, United Kingdom;1. School of Materials, University of Manchester, Manchester, M13 9PL, UK;2. Rolls-Royce plc, PO. Box 31, Derby, DE24 8BJ, UK |
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Abstract: | This study examines the electrophoretic deposition of Yb2Si2O7 particles on SiC substrates to produce Environmental Barrier Coatings. To prepare crack-free and homogeneous green coatings, the effect of the solvent, dispersant concentration, and pH were investigated. Ethanol provided a well-dispersed suspension and crack-free coating which was shown by sedimentation tests and microstructure analysis. The effect of the dispersant concentration was investigated with zeta potential measurement and microstructure analysis with a concentration above 0.5 g/L resulting in higher ionic strength and producing cracked and uneven coatings. The ionic strength was also associated with the powder packing density with larger indentation impressions measured for loosely packed coatings. The deposition rate depended on the suspension properties influenced coating integrity with delamination evidenced by analysing the current density drop during deposition. Sintering of the green coatings having different densities and microstructure showed their importance in the preparation of uniform and dense sintered coatings. |
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Keywords: | Electrophoretic deposition Environmental barrier coating Colloidal stability Packing density |
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