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Die Nutzung elektrokinetischer Ergebnisse zur Kontrolle und gezielten Beeinflussung des Ceramic Processings

: Richter, H.J.; Friedrich, H.; Hermel, W.

Fortschrittsberichte der Deutschen Keramischen Gesellschaft 8 (1993), Nr.4, S.147-161
ISSN: 0177-6983
Fraunhofer IKTS ()
acoustophoresis; Akustophorese; aluminium oxide; Aluminiumoxid; microelectrophoresis; Mikroelektrophorese; processing; Siliciumnitrid; silicon nitride; streaming potential; Strömungspotential; yttrium oxide; Yttriumoxid; Zetapotential

The application of several electrokinetic measurement techniques - microelectrophoresis, acoustophoresis and streaming potential measurement - is discussed with respect to the ceramic processing. Examples for the electrokinetic characterization of silicon nitride and oxide sintering additives are presented. The pH of the aqueous suspension as well as the type and the concentration of organic additives (deflocculants) strongly influence the electrophoretic mobility and therefore the stability of the suspended particles. For example the surface charge of yttriumoxide at pH equal 9 alters from positive charge to negative charge by adding a polyelectrolyte deflocculant to the suspension.