Unlimited

Electrophoretic deposition of ceramic particles on porous graphite and their penetration into the pores was demonstrated and studied both theoretically and experimentally. The theoretical analysis enables to predict the penetration depth ofthe particles as function of two non-dimensional parameters based on solvent p'operties, field strength and particle size and concentration. In tile experimental Istidies. the amount of induced material was found to increase with the ratio of Idielectric constant to viscosity of the solvent, as well as with particle concentration and field intensity. However, due to simultaneous buildup of anjoverlying deposit penetration as function of deposition time reaches a plateau. In prallel studies onl electrolytic deposition, ZrO2 coatings were deposited onl porous graphite from an aqueous solution of Zr0(N03)2. The deposition kinetics anduicrcGt'jcture of the deposit were studied. The initial amorphous deposits transformed into crystalline Zr02 polyinorphs with ninocrystalline dimensions following heat treatment