Effect of binder addition on optimum additive amount of dispersant for aqueous BaTiO3 slurry

Determination of optimum slurry evaluation method for the prediction of BaTiO3 green sheet density

“…As mentioned in the previous study [19], it was already confirmed that this apparent viscosity change with PCA additive dosage was occurred by changing particle dispersion state and viscosity of medium. Therefore, it was found that the PCA 2 mg·g -1 added slurry was most dispersed within the range of these PCA additive dosages from this result.…”

Effect of medium condition change on green body density during casting and drying

“…These authors reported that this was caused by insufficient inter‐particle repulsion forces, the interaction between the dispersant and the binder, and the degradation of the dispersant by the dispersing process. In our past studies, which examined pH‐controlled alumina slurry 24,25 and slurry containing PCA and PVA, 32,39 the change of particle dispersion state in the slurry during sedimentation had already been confirmed; so it was expected that this phenomena would also occur in the current study. Consequently, a verification test to confirm it was conducted, and the changes of particle dispersion state were demonstrated, as shown in Figure .…”

“…Generally, a slurry whose particles are well dispersed has low apparent/relative viscosity and is assumed to form a dense sediment; however, our study demonstrates different results. Some findings reported in previous studies indicated that the apparent viscosity of the just‐prepared slurry did not completely correlate with the packing fraction of the sediment, or the particle dispersion state changed over time 24,25,32,37–39 . These authors reported that this was caused by insufficient inter‐particle repulsion forces, the interaction between the dispersant and the binder, and the degradation of the dispersant by the dispersing process.…”

“…Accordingly, the polymers (such as the non‐adsorbed dispersant and binder) left the particle layer along with the medium. In a previous study, Iwata and Mori 39 reported that barium titanate particles in an aqueous slurry were aggregated by the interaction of PCA as a dispersant and PVA as a binder; furthermore, the degree of aggregation depended on the amount of non‐adsorbed PCA. In the present study, it was confirmed that the aggregation effect was similar to the previous study 39 by comparing the adsorbed amount of PCA to alumina particle (Figure ) and the aggregation behavior during particle condensation.…”

“…In a previous study, Iwata and Mori 39 reported that barium titanate particles in an aqueous slurry were aggregated by the interaction of PCA as a dispersant and PVA as a binder; furthermore, the degree of aggregation depended on the amount of non‐adsorbed PCA. In the present study, it was confirmed that the aggregation effect was similar to the previous study 39 by comparing the adsorbed amount of PCA to alumina particle (Figure ) and the aggregation behavior during particle condensation. This result suggested an aggregation mechanism; however, if the amount of polymers that led to particle aggregation were different in the casting methods, the effect would be varied.…”