Characterization and consolidation of aqueous SiC suspensions
- Autor: Both, H von; Oberacker, R; Hoffmann, MJ
- Quelle: ZEITSCHRIFT FUR METALLKUNDE, 1999, Band 90, Heft 12, S. 996–1001
- Characterization and consolidation of aqueous SiC suspensions.
Abstract
The structure of SIC suspensions is strongly influenced by the nature
of the interparticle forces between powder particles. By varying the pH
the stabilization conditions are changed from an agglomerated to a
dispersed suspension structure. The different structures were
macroscopically characterized by rheological measurements and
microscopically by CRYO-SEM investigations. Consolidation of the
suspensions has been obtained by pressure filtration. The analysis of
the filtration kinetics shows a direct relationship between suspension
and filter cake structures. It will be demonstrated that the suspension
properties influence the porosity and pore size distribution of the
green compact. The permeability, calculated from the filtration
kinetics, shows a structural coherence between filter cake porosity and
pore size distribution and is related to the model of Carman-Kozeny.