Abstract    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 obtained results, isopropanol is a suitable media to obtian compact layers which is attributed to unique properties of this media. The crack- free layers were obtained using multi-step electrophretic 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.

Keywords    electrophoretic deposition, carbon, coating, Al2O3 nanoparticle

چکیده    در این مطالعه لایه­نشانی الکتروفورزیس برای بدیست آوردن لایه­ای بدون ترک و متراکم روی زیرلایه کربنی مورد بررسی قرار گرفت. مطالعه ریزساختاری لایه بدست آمده توسط میکروسکوپ الکترونی روبشی و میکروسکوپ نوری نشان داد که یک لایه بدون ترک میتواند توسط پیوسته EPD حاصل شود. برطبق نتایج بدست آمده، ایزوپروپانول به علت داشتن ویژگی­های مناسب فیزیکی محیطی مناسب برای حصول یک لایه متراکم و فشرده است. لایه­ های بدون ترک توسط تکنیک لایه ­نشانی چند مرحله­ ای بدست آمد در حالیکه استفاده از تکنیک EPD تکنیک منجر به ایجاد لایه­ های ترک خورده شد. به نظر می­رسد که ترک نخوردن لایه ایجاد شده به شرایط خشک کردن آن­ها وابسته است.

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