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Forming of Ceramic Coatings by Dipping and EPD Through Carrageenan Gelation

机译：角叉菜胶凝胶浸渍和EPD形成陶瓷涂层

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摘要

The use of ceramic coatings and tailored composite materials has gained interest for many structural applications. Dipping and electrophoretic deposition (EPD) have demonstrated to be economic and simple methods to obtain coatings and self-supported microlaminates, while gelcasting with biopolymers is a powerful route for manufacturing complex-shaped bulk parts. The combination of these two forming processes has led to the development of a new method for manufacturing ceramic coatings from aqueous suspensions. Graphite and ceramic substrates were coated with Al_2O_3/ZrO_2 films by combining either dipping or EPD with carrageenan gelation. The rheological behaviour of Al_2O_3/ZrO_2 aqueous suspensions was studied as a function of temperature focusing the effect of the concentration of gelling additive and the volume fraction of particles. Its effect on the EPD conditions was also studied in order to obtain uniform and reliable films. After sintering at 1550 ℃/2h dense films with a thickness ranging from 10 to 300 μm were obtained.
机译：陶瓷涂层和量身定制的复合材料的使用已引起许多结构应用的兴趣。浸渍和电泳沉积（EPD）已证明是获得涂层和自支撑微层压板的经济且简单的方法，而用生物聚合物进行凝胶浇铸是制造复杂形状的散装零件的有效途径。这两种成型工艺的结合导致了开发一种从水性悬浮液制造陶瓷涂料的新方法。通过将浸渍或EPD与角叉菜胶凝胶化相结合，在石墨和陶瓷基材上涂覆Al_2O_3 / ZrO_2膜。研究了Al_2O_3 / ZrO_2水性悬浮液的流变行为与温度的关系，重点关注胶凝添加剂浓度和颗粒体积分数的影响。为了获得均匀而可靠的薄膜，还研究了其对EPD条件的影响。在1550℃/ 2h烧结后，得到致密的薄膜，厚度在10到300μm之间。

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