Influence of anionic stabilization of alumina particles in 2-propanol medium on the electrophoretic deposition and mechanical properties of deposits |
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| Affiliation: | 1. CEITEC – Central European Institute of Technology, Brno University of Technology, Technicka 10, Brno 61600, Czech Republic;2. Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 464/118, Brno 61200, Czech Republic;3. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 513/22, Brno 61662, Czech Republic;1. CIQ-UP, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Portugal;2. INFU, Faculty of Chemistry, Technical University of Dortmund, Otto-Hahn-Str. 6, Dortmund D-44221, Germany;3. Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, SE 20506 Malmö, Sweden;1. Institut für Struktur- und Funktionskeramik (ISFK), Montanuniversität Leoben, Peter Tunner Strasse 5, A-8700 Leoben, Austria;2. National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom;1. Thin Film Physics Department, Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Konkoly-Thege M. Str. 29-33, 1121 Budapest, Hungary;2. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, HAS, Konkoly-Thege M. Str. 29-33, 1121 Budapest, Hungary;3. Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, 1518 Budapest, Hungary;1. NASA Glenn Research Center, Cleveland, OH, United States;2. National Institute of Standards and Technology, Gaithersburg, MD, United States;1. School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, UK;2. Nanoforce Technology Limited, London E1 4NS, UK;3. Wolfson Centre for Magnetics, Cardiff School of Engineering, Cardiff University, UK |
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| Abstract: | The ceramic dispersions were prepared using 0.85, 1.70, 4.25, 12.75 or 21.25 wt.% of monochloroacetic, dichloroacetic or trichoroacetic acid, 15 wt.% alumina and 2-propanol. The mechanism of anionic stabilization in 2-propanolic media was described. Alumina green bodies were prepared from the stable dispersion via electrophoretic deposition (EPD). It was found that increasing dispersion conductivity significantly influenced the EPD yields. The most effective electrophoretic depositions were performed from dispersions with conductivity in range 4.0–5.3 × 10−4 S m−1. Deposits with the highest green density were prepared from the dispersion stabilized by trichloroacetic acid. This behavior was explained by low voltage drop during deposition. The surface roughness was high at low dispersion conductivity and with increasing acid concentration in dispersion the surface of deposits was smoother. The mechanism of particle arrangement in deposit was discussed. Influence of stabilizer amount in the dispersion on the hardness and fracture toughness was described. |
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| Keywords: | Anionic stabilization Electric conductivity Alumina Electrophoretic deposition |
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