Electrophoretic Bubble-Free Deposition on Anodes from Aqueous Alumina and Zirconia Suspensions with Hydroquinone: Fabrication of Alumina/Zirconia Gradiented Composites

抄録

Non-aqueous suspensions are preferred for electrophoretic deposition (EPD) to prevent electrolysis of the solvent and to obtain a bubble-free deposit. On the other hand, aqueous systems have the advantages of low cost and low environmental burden. However, water is decomposed into hydrogen and oxygen when a dc current is passed through an aqueous media. It is well known that hydroquinone (HQ) is easily oxidized to quinone (Q), and this reaction decreases the levels of dissolved and electrolytically produced oxygen. In the EPD process, oxygen produced electrolytically would be consumed by the chemical oxidation of HQ, followed by bubble-free deposition on the anode. In this study, we investigated EPD on various anodes of aqueous alumina and zirconia suspensions with HQ and also attempted to fabricate bubble-free alumina/zirconia gradiented composites.