Electrophoresis forming is an economical and reliable method for the fabrication of coatings and laminate ceramics. The process is simple, but a major problem is the toxicity and environmental problem associated with the organic solvents usually employed as vehicle media. This work aims to obtain bodies of Al2O3 by electrophoretic deposition using aqueous slips. The stability of the slips was studied, as a function of the different dispersants, by qualitative measures of viscosity by the Pitot and pH method. These processing parameters were accomplished in suspensions containing between 0.5 to 4.0wt.% of dispersants as the poli(ammonium acrylate) (DREW), para-aminobenzoic acid (PABA) and quitosan. The largest value of green density, 37.5% of the theoretical density and deposition rate, 33.2 mg/min, was obtained for bodies deposited in 6.0 V/cm with DREW.
electrophoresis; dispersant; deflocculation
