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  4. Korrelationen in der Kette Pulvereigenschaften - Processing - Werkstoff- und Bauteileigenschaften
 
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1994
Journal Article
Title

Korrelationen in der Kette Pulvereigenschaften - Processing - Werkstoff- und Bauteileigenschaften

Abstract
The influence of the powder properties and the processing conditions on the ceramic material properties are discussed with respect to silicon nitride ceramics. The surface of several Si3N4-powders can be modified by treatment with fluoric acid. The isoelectric point shifts from a pH range between 5,0 and 6,3 for the starting powders to a pH range between 8,2 and 8,7 for the acid treated powders. The changed surface chemical properties of the powders influence the adsorption of the deflocculant and thus the viscosity of aqueous slips. A comparison of several processing routes shows that the mechanical strength of the sintered material can by increased by optimum use of the electrokinetic principles for the stabilization of the suspension (pH, deflocculant).
Author(s)
Hermel, W.
Schubert, C.
Richter, H.J.
Journal
Fortschrittsberichte der Deutschen Keramischen Gesellschaft  
Language
German
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Keyword(s)
  • ceramic materials

  • keramische Werkstoffe

  • mechanical strength

  • mechanische Festigkeit

  • Oberflächenmodifizierung

  • powder properties

  • processing

  • Pulvereigenschaften

  • Siliciumnitrid

  • silicon nitride

  • surface modification

  • viscosity

  • Viskosität

  • Zetapotential

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