HANNOVER MESSE 2020, 20 - 24 April
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Versatile and robust ceramic filter

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Versatile and robust ceramic filter

Product description

Frequently, ceramics are applied for the filtration of aggressive liquids. To separate substance mixtures containing variably sized particles, various filters have to be arranged in series. By means of stepwise filtration, coarse particles are removed first, smaller particles later on. The ceramic elements used for this purpose are structures of variable pore size. This may cause stability problems, as their joints are rather weak. At the KIT scientists have now succeeded in producing a filter that consists of two ceramic phases of variable pore size. These filters are monolithic, which means that they are connected to each other without any adhesive. For the first time, freeze casting is combined with slip casting for filter manufacture. In freeze casting, an aqueous ceramic suspension is frozen with a controlled temperature gradient. The resulting ice lamellae enclose the ceramic particles. Upon ice sublimation, i.e. transition from the solid to the gaseous phase, a green body with a lamellar pore structure forms. When ceramic slip is applied to this green body, it partly penetrates into the ceramic structure. Subsequent sintering yields a single ceramic component having a structure of coarser lamellae (width and spacing 20 - 250 µm) on one side and a finer, statistically distributed pore structure on the other (pore sizes ranging from 0.2 - 5 µm). Both phases are connected by a transition zone. Consequently, mechanical stability exceeds that of joined ceramics. The pore size and the pore structure can be adjusted flexibly by the process conditions. Such ceramics are predestined for use as filters for stepwise separation, but may also be applied as insulating material.

You can get an overview of this technology at KIT stand. Detailed information can be exchanged individually in contact with the responsible scientific employees of KIT after the industry fair.

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