Abstract

The possibility of forming bulk compacts via electrophoretic deposition (EPD) using a nanopowder based on yttria-stabilized zirconia (YSZ) is considered. Features of the kinetics of mass growth and changes in cell resistance and the morphology of the sediment during a long deposition time are studied using different geometries of the counter electrode of the EPD cell (flat and conical). EPD is performed with a stepwise increase in electric field strength. It is found that the shape of the counter electrode does not appreciably affect either the kinetics of changes in current or the growth of cell resistance, or the fraction of the solid phase in the wet compact in a suspension with sufficiently low conductivity (∼22.2 μS/m). Slight increases of 8–10% in the mass of wet and dry compacts and 10.5% in the electric current are observed when a conical form of the counter electrode is used instead of a flat one. Numerical modeling is done in a two-dimensional approximation, allowing determination of the effect the counter electrode’s geometry has on the local distribution of the electric potential and current density near the electrode.

中文翻译：

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氧化锆纳米粉体压块电泳形成的特征

摘要

考虑使用基于氧化钇稳定的氧化锆（YSZ）的纳米粉通过电泳沉积（EPD）形成块状压块的可能性。使用EPD电池对电极的不同几何形状（扁平和圆锥形）研究了在长沉积时间内质量增长的动力学特征以及电池电阻的变化以及沉积物的形态。EPD的执行是逐步增加电场强度。发现反电极的形状不会显着影响电流变化的动力学或电池电阻的增长，也不会显着影响电导率足够低（〜22.2μS）的悬浮液中湿压块中固相的分数/ m）。湿压粉和干压​​粉的质量略有增加，增加了8-10％，增幅为10。当使用锥形形式的对电极代替平电极时，可观察到5％的电流。在二维近似中进行数值建模，从而可以确定对电极的几何形状对电极附近的电势和电流密度的局部分布的影响。