Influence of anionic stabilization of alumina particles in 2-propanol medium on the electrophoretic deposition and mechanical properties of deposits

0434881 - ÚFM 2015 RIV GB eng J - Journal Article
Drdlík, D. - Bartoníčková, E. - Hadraba, Hynek - Cihlář, J.
Influence of anionic stabilization of alumina particles in 2-propanol medium on the electrophoretic deposition and mechanical properties of deposits.
Journal of the European Ceramic Society. Roč. 34, č. 14 (2014), s. 3365-3371. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : Anionic stabilization * Electric conductivity * Alumina * Electrophoretic deposition
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
Impact factor: 2.947, year: 2014

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 preparedfrom the stable dispersion via electrophoretic deposition (EPD). It was found that increasing dispersion conductivity significantly influenced theEPD yields. The most effective electrophoretic depositions were performed from dispersions with conductivity in range 4.0–5.3 × 10−4S m−1.Deposits with the highest green density were prepared from the dispersion stabilized by trichloroacetic acid. This behavior was explained by lowvoltage drop during deposition. The surface roughness was high at low dispersion conductivity and with increasing acid concentration in dispersionthe surface of deposits was smoother. The mechanism of particle arrangement in deposit was discussed. Influence of stabilizer amount in thedispersion on the hardness and fracture toughness was described.
Permanent Link: http://hdl.handle.net/11104/0238852