Multi-Step Electrophoretic Deposition of َAlpha-Al2o3 Nanoparticles on Carbon Substrate

In the present study, electrophoretic deposition (epd) was used to obtain dense and crack-free layers of al2o3 on carbon substrate. microstructural study of the obtained layers by scanning electron (sem) and optical microscopy (om) approved that crack-free layers can be obtained by epd technique. according to these results, isopropanol is a suitable media to obtian compact layers. this is attributed to the unique properties of this media. to obtain a stable suspention, polyvinylpyrrolidon (pvp) was added to the isopropanol as dispersant agent. the crack- free layers were obtained using multi-step electrophoretic depostion while using continous epd process led to the deposition of severly cracked layers. it seems that cracking behaviour of electrophoretically deposited films depends on drying conditions.