The influence of solid type and content on the rheological behaviour of coagulated slurries and their bearing on the consolidation by pressure filtration

The Binding of Monovalent Electrolyte Ions on α-Alumina. II. The Shear Yield Stress of Concentrated Suspensions

“…Each of these characteristics is of particular importance in the colloidal processing of ceramic materials, where the use of monovalent electrolytes as flocculation agents is currently generating significant interest. In general, the concentration of electrolyte is adjusted to produce a weakly flocculated particulate suspension in which particle rearrangement is facilitated during the consolidation process. ,− The result is a stable green body of high and regular density that should give rise to ceramic products of sound structural integrity. , …”

Lignosulfonate adsorption on and stabilization of lead zirconate titanate in aqueous suspension

“…This type of fabrication route suffers from three inherent disadvantages: (i) die-wall and interparticle friction during compaction invariably produce bulk density gradients in the powder compact that, in turn, can result in nonuniform firing shrinkage, heterogeneous microstructures, and residual porosity [1]; (ii) hard agglomerates of particles in the starting powder can lead to strengthlimiting flaws in the sintered product [2]; and (iii) production is limited to relatively simple shapes having low aspect ratios and small-to-moderate dimensions. Ceramic wetforming techniques such as slip-casting [3], pressure-casting [4], and thixotropic-casting [5] involve the deposition of particles from well-dispersed suspensions to form powder compacts of relatively uniform bulk density, and thus uniform firing shrinkage, and are well suited to the fabrication of large and/or intricate-shaped articles. Wet-forming techniques avoid the use of dry powders, thereby minimizing the occurrence of hard agglomerates in the powder compact.…”