THE CONSOLIDATION OF TITANIUM BARIUM NANOPOWDER SUSPENSIONS BY ELECTRIC FIELD ACTION
DOI:
https://doi.org/10.15421/081911Keywords:
BaTiO3, EPD, nanopowder, coating, suspension, tensile, roughnessAbstract
The influence of BaTiO3 nanopowder dispersion in a mixture of acetylacetone-ethanol on the physicochemical and surface properties of electrophoretic coatings has been investigated. From the above data it can be seen that increasing the content of acetylacetone in a suspension increases the intensity of electrophoretic deposition of ferroelectrics. In addition, this effect is manifested of mixture ethanol-acetylacetone (1:1). With a higher content of acetylacetone, the weight of coatings is slightly reduced.
Moreover, the investigation of the surface structure BaTiO3 electrophoretic coatings showed that the profiles of their surfaces Ra and Rz increased with electric field to 100 V/cm. An increase in the duration of dispersion of a powder in a mixture of acetylacetone-ethanol is accompanied by a decrease in the roughness of the coating surface, especially at low values of the tension of electric field. Thus, homogeneous electrophoretic coatings can be formed by deliberately changing the conditions of formation and deposition of suspensions BaTiO3 nanopowders.
It is first stated the sedimentation for 2 % suspensions of BaTiO3 nanodispersed powder, depending on the time of milling dispersion. Together with the laser granulometry it was stated that exactly 48 hours of dispersion produce homogeneous and stable suspensions. The precipitation of a suspension in the region of 10–20 V/cm, BaTiO3 coatings can be formed by roughness of Ra 90–150 nm and Rq 100–150 nm, respectively.
The results of the research will be used in the development of technology for the formation of multilayer capacitors.
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