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Influence of powder morphology on properties of ceramic injection moulding feedstocks

Einfluss der Pulvermorphologie auf die Eigenschaften von keramischem Spritzgieß-Einsatzmaterial
: Mannschatz, Anne; Müller, Axel; Moritz, Tassilo


Martynczuk, J.-M.:
ICCPS 2010, 11th International Conference of Ceramic Processing Science. Special issue : ETH Zurich, Switzerland from August 29th to September 1st in 2010
Amsterdam: Elsevier, 2011 (Journal of the European Ceramic Society 31.2011, Nr.14)
International Conference of Ceramic Processing Science (ICCPS) <11, 2010, Zurich>
Bundesministerium für Bildung und Forschung BMBF
Process innovation and energy saving in the cement and derived fuels applying industry by the use of alkali-corrosion resistant layers and components
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer IKTS ()
injection moulding; platelets; defects; beta-alumina

The powder-binder-mixture is the most critical aspect in the injection moulding processing chain, because the feedstock properties determine the success of the following steps, i.e. excellent flowability in the injecting phase and high green strength during debinding. Therefore, nearly spherical particles which pass each other easily in the feedstock stream are advantageous. The applicable particle size is limited in order to reach high solids loadings which are connected with the specific powder surface. According to this, in this study a very unfavourable powder was introduced into a feedstock. The investigated beta-alumina powder consists of plate-like primary particles and has a specific surface of 25 m2/g. During mould filling the particles orient in the feedstock stream which affects the debinding and sintering behaviour and is the source of defects. The influence of the plate-like shape on defect formation is demonstrated in comparison to spherical-shaped particles having the same specific surfaces.