The interest in electrophoretic deposition (EPD) for nanomaterials and ceramics production has widely increased due to the versatility of this technique to effectively combine different materials in unique shapes and structures. We successfully established an EPD layering process with submicrometer sized powders of Y-TZP with different mol percentages of yttrium oxide (3 and 8%) and produced multilayers of alternating tetragonal and cubic phases with a clearly defined interface. The rationale behind the design of these multilayer constructs was to optimize the properties of the final ceramic by combining the high mechanical toughness of the tetragonal phase of zirconia together with the high ionic conductivity of its cubic phase. In this work, a preliminary study of the mechanical properties of these constructs proved the good mechanical integrity of the multilayered constructs obtained as well as crack deflection in the interface between tetragonal and cubic zirconia layers.
The interest in electrophoretic deposition (EPD) of ceramics has widely increased owing to its versatility to combine different materials in unique shapes and structures interesting for several applications (e.g. solid oxide fuel cells, thermal barrier coatings and biomaterials). In this work, an automated robotic EPD set-up was constructed and used to produce tetragonal and cubic zirconia multilayered specimens, which combine the high conductivity of the cubic layer with the high toughness of the tetragonal layer. This automated EPD set-up allowed us to study in detail the very sensitive EPD process, whose success highly depends on a good control of the EPD parameters (e.g. electrode distance, applied tension, deposition time). Tetragonal layers of 20 μm and cubic layers of 10 μm were obtained with high reproducibility. The in situ measurement of the electric current evolution with the deposition time enabled us to analyse the EPD process for each layer.
El interés por la deposición electroforética (EPD) de la cerámica o compuestos de cerámica ha aumentado mucho debido a la posibilidad de crear bloques de cerámica en verde con varias características interesantes para aplicaciones biomédicas, por ejemplo, cerámicas porosas y/o laminadas con un gradiente de funcionalidad. A fin de obtener una buena deposición de cerámica es necesario el uso de electrodos de elevada conductividad. Los metales con alta conductividad se utilizan comúnmente para esta aplicación. En este trabajo se propone el uso de polímeros de bajo coste, no conductores, como electrodos. Para aumentar su conductividad, los electrodos de polímero se recubrieron mediante sputtering con oro o carbono. El aumento de la conductividad obtenido permite la deposición de diversas cerámicas ampliamente utilizadas en la productos dentales y ortopédicos, como son la zirconia estabilizada con ytria (Y-TZP), la alúmina o la hidroxiapatita (HA). The interest in electrophoretic deposition (EPD) of ceramics or ceramic composites has widely increased due to the possibility to create green bodies with several interesting characteristics for biomedical applications, for instance porous and/or laminated functionally graded ceramics. In order to get a good ceramic deposition the use of high conductive electrodes is required. Metals with high conductivity are commonly used for this purpose. In this work, the use of low cost non conductive polymers as electrodes is proposed. To increase their conductivity, these polymer electrodes were sputtered with gold or carbon. The conductivity increase obtained by the sputtering allowed the deposition of different ceramics widely used in the dental and orthopaedic industry, as yttria stabilised tetragonal zirconia particles (Y-TZP), alumina and hydroxyapatite (HA).
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