Injection molding of submicrometer zirconia: blend formulation and rheology

Optimization of the Processing of 8‐YSZ Powder by Powder Injection Molding for SOFC Electrolytes

“…However, the flow behavior of the feedstock prepared with SA‐coated powders is basically identical, but the values are reduced almost one order of magnitude in the entire shear rate range studied with regard to the mixture with the same binder composition. This decrease is considerably higher than others studied in zirconia powder, where the viscosity was slightly reduced at a similar temperature 17 or the reduction was about 0.3 or 0.4 order of magnitude with about 5% of SA 14 . This fact suggests that the decrease in the viscosity is determined not only by the SA coating but also by the method of dispersion, where the surfactant agent with the ceramic powders is decisive.…”

Torque rheology of zircon feedstocks for powder injection moulding

“…Moreover, pressures registered for values above 2000 s −1 exceed the maximum of the permitted by the pressure transducer used. The same occurs 19 proposed the activation energy value of 40 kJ/mol as the level above which the probability of defects occurring during injection moulding becomes unacceptable for sub-micrometer zirconia blends. All the activation energies, except for the 57.5 vol.% of solid loadings, fairly exceeds this value in almost all the shear rates.…”

Effect of powder loading on metal injection molding stainless steels

“…Huzzard and Blackburn [7] studied the influence of the powder loading on the rheological behavior of alumina aqueous pastes at five levels of powder loadings. Allaire et al [8] found that a feedstock with too higher powder loading had a viscosity greater than 1000 Pa s and exhibited a higher sensitivity to changes in temperature than feedstocks containing lower concentrations of zirconia powder. De Souza et al [9] got a higher powder loading with deagglomerated tungsten powder prepared by rod-milled as-received agglomerated tungsten powder.…”