High‐Temperature Flow Behavior of Ceramic Suspensions

Abstract

The objective of this study was to investigate the effects of temperature and solids loading on the viscosity of two nonaqueous ceramic suspensions. In this article, the viscosity of Al 2 O 3 suspensions with 5%-50% solids loading and hydroxyapatite suspensions with a solids loading of 5%-40% were measured at temperatures of 25°, 45°, 65°, and 75°C. The high-shear Newtonian viscosity at various temperatures was reduced to a single curve by the reduced viscosity and the temperature-adjusted solids volume fraction of the suspensions. The Krieger-Dougherty model, with the intrinsic viscosity corrected for particle geometry, was fitted to the data and was observed to provide a satisfactory description to the solids-loading-viscosity data for both suspensions.

Viscosity and Acoustic Behavior of Ceramic Suspensions Optimized for Phase‐Change Ink‐Jet Printing

“…Assuming a spherical particle, this increase in effective volume fraction of particles in suspension is related to the steric layer thickness (δ) by Where d p is the particle diameter. A simple calculation under the assumption of random close packing and using the average particle diameter ( d 50 ) provides an estimate of about 10 nm for the steric layer thickness, which is within the range reported by other authors for identical systems 29,32 …”

“…3 indicate an activation energy for viscous flow of 10.5 kJ/mol in the temperature range 65°–115°C. This is slightly lower than values reported in the literature for various wax–polyethylene blends and acrylate monomers 29,30 …”

“…This is slightly lower than values reported in the literature for various wax-polyethylene blends and acrylate monomers. 29,30 All suspensions are shear-thinning above 20 vol% solids, reaching a Newtonian (constant viscosity) plateau in the high shear rate domain. This behavior is characteristic of well-dispersed concentrated suspensions and, as is shown in Fig.…”

Influence of Sucrose Addition on Rheology of Alumina Slurries Dispersed with a Polyacrylate Dispersant

“…The precise nature of the non‐Newtonian rheological behavior is determined by the strength of the inter‐particle network 9–12 . The strength of the inter‐particle network in non‐Newtonian slurries varies with the means adopted to disperse the ceramic particles—electrostatic, steric, electrosteric 13–26 …”

Role of deflocculants on the rheological properties of boehmite sol

“…Brownian motion dominates and the structure of the suspension remains relatively undisturbed, under extremely low shear rates. The viscosity in this region is independent of the shear rate and attains the ''low-shear Newtonian limit'' of the suspension [10,11]. As the shear rate increases, the particle structure in the suspension is disrupted and the viscosity of the suspension decreases as the shear rate increases, leading to ''shear thinning.''…”