Electrophoretic Deposition of Nanocrystalline SiC Ceramics
In the present contribution, the electrophoretic deposition (EPD) of nanocrystalline SiC powders will be discussed. In order to avoid the electrolysis of water during deposition as well as oxygen uptake of the nanocrystalline SiC by hydrolysis reactions, nonaqueous solvents were tested including ethanol and diethyl formamide. The solvents were compared regarding their effect on particle size distributions and sedimentation tests. Auxiliary information on the surface conditions as a function of the acidity of the suspension was drawn from aqueous zeta-potential measurements. The influence of dispersants, binders and the type of powder on the suspension properties was studied, and EPD was performed. For promising solvent-dispersant systems, the film thickness, current and deposition time at a given voltage were monitored during EPD.
A.R. Boccaccini, O. Van der Biest and R. Clasen
S. Wildhack and F. Aldinger, "Electrophoretic Deposition of Nanocrystalline SiC Ceramics", Key Engineering Materials, Vol. 314, pp. 33-38, 2006