Use of agar gel as additive in alumina injection molding

Reference Presenter Authors
(Institution)
Abstract
13-055 Leonardo Oliveira Thomazini, E.F.(Technological Institute of Aeronautics); Oliveira, L.(Institute of Aeronautics and Space); Cairo, C.A.(Institute of Aeronautics and Space); Graça, M.L.(Institute of Aeronautics and Space); Powder injection molding is a technique for manufacturing ceramic components with complex geometries, whose shapes are not possible to obtain by regular techniques. The success of this process depends on the use of a ceramic mass with specific rheological properties that can only be obtained with the temporary use of organic additives to confer plasticity to the ceramic powder. However, the extraction of these additives makes the sintering a critical stage of processing in this technique due to the complexity of degradation and evaporation processes, requiring a precise control of the parameters. in this work we studied the technical viability of using agar gel as additive in alumina injection. The advantage of this system is that much of the binder volume is water, which makes the extraction process as simple as conventional drying. The mixing parameters were determined for the production of an homogeneous feedstock with 4 wt% of agar dissolved in 18 wt% of water in relation to alumina. The obtained samples presented a density of 3.80 g/cm3, with a fine and homogeneous microstructure and free of manufacturing defects, proving the viability of the use of agar gel as and additive in the injection of ceramic components.
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