Particle network rearrangement during pressure filtration and sedimentation: Analysis by gamma-ray densitometry.

摘要

Recent studies show that properties of sintered ceramics can be significantly affected by particle packing defects that evolve prior to sintering. For example, reduced fracture strengths are often attributed to differential shrinkage stresses incurred during drying and sintering operations; these stresses result from large pores and variations in packing structure uniformity. Regulating these defect populations requires a better understanding of how physical parameters affect processes of agglomerate restructuring and pore closure during successive processing stages (suspension preparation, shape-forming, drying, and sintering). In particular, effects of dispersant chemistry on ceramic particle rearrangement are poorly understood; improved analytical methods are necessary to evaluate the influences of solution chemistry parameters on rearrangement forces at particle-particle interfaces.