Fabrication of oxid ceramics by using FDM/FFF technology

Reference Presenter Authors
01-075 Frank Jörg Clemens Clemens, F.J.(Empa, Swiss Federal Laboratories for Materials Science and Technology); Gorjan, L.(Empa, Swiss Federal Laboratories for Materials Science and Technology); Fused deposition modelling (FDM) or fused filament fabrication (FFF) is a widely used additive manufacturing technique for shaping of thermoplastic materials. The polymer material is extruded into a filament with constant diameter to be able to feed it by motor driven feeding rollers s into a heated extrusion head. There the polymer melts and is extruded through a thin nozzle. The extrusion head moves according to the programed path and is depositing a thin filament of material which quickly cools and solidifies. The resolution is mainly influenced by the nozzle size and thereby by the dimension of the deposited filament size as well as the working distance between the orifice of the extrusion nozzle and the working platform. In this way the head makes one layer with the desired shape and pattern of the deposited material. After the competition of the first layer the head is lifted and a new layer is deposited on top of the previous. Finally a complete part is constructed layer by layer. FDM/FFF has already been used for ceramic processing. The FDM/FFF of ceramics is a thermoplastic shaping technique and therefore potential polymers are similar to those used for thermoplastic pressing, extrusion, injection moulding. In this work we focused on 3D printing of different ceramic materials (PZT, TCP and Al2O3) using different Ethylene Vinyl Acetate co-polymers (EVA) as a binder. According to previous works EVA looks like a promising candidate for 3D printing of ceramic structures by thermoplastic fused filament fabrication technology. Rheological characterisation as well as printing and thermal treatment was investigated. The EVA significantly affects the shape stability of the printed structures and the debinding process step significantly.
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