A viscoelastic approach from α-Al2O3 suspensions with high solids content

Fabrication of ZnO periodic structures by 3D printing

“…The ZnO ink presented a partial recovery of 48.16%. This result is in agreement with previous results using similar particulate suspensions [27]. The creep-recovery result confirmed the frequency sweep test, demonstrating that ZnO ink was viscoelastic.…”

Optimization of Alumina Slurry for Oxide-Oxide Ceramic Composites Manufactured by Injection Molding

“…The bridging effect also increases with the reduction of the particle size. Several studies reported the use of small molecules such as ascorbic acid [11], citric acid [17,18], or nitric acid [19][20][21] for the dispersion of alumina particles. The adsorption of the molecules occurs between its ionic functional group and the charged oxide of the alumina particle through a ligand exchange process [8,11].…”

β-Tricalcium phosphate shaped by replica method

“…1), and particle diameters varying around 2.0 μm but with agglomerated appearance, indicating that in preparing TCP suspensions the powders would need to be suitably dispersed. These parameters directly influence the behavior of the concentrated suspensions [27][28][29], making the effects, as dilatancy, when the viscosity increase with shear rate increment, even more pronounced in ceramic processing of suspensions with high solids concentrations (>65% by mass) [23] and under shear (>100 s -1 ) due to changes in the packaging factor [27]. Fig.…”

“…Thus, following the study, the 2.5% concentration of sodium silicate was used, so that there was enough dispersant to cover particles to be deagglomerated after homogenization in a ball mill. The suspensions, produced with distilled water and stirred in a ball mill for 24 h to obtain homogeneity [20,23], were then characterized in terms of flow in a rotational rheometer. The standard deviation on rheological measurements was approximately 5%, as stated by the manufacturer.…”

“…After dispersant concentration determination, the suspensions were homogenized for 24 h in a ball mill [23] and rheological measurements were performed on a rotational rheometer (Viscotester IQ, Thermo Haake, Germany) using concentric cylinders as a sensor. The curves were performed in controlled rate (CR) mode by increasing the shear rate from 0 to 1000 s -1 , in 500 s, maintaining at 1000 s -1 for 60 s, returning to 0 s -1 in 500 s [18].…”