Optimization of tape casting process via surface modification of glass/Al2O3 powder

The tape casting process for manufacturing low‐temperature co‐fired ceramic green sheets: A review

“…The powders settled under the action of gravity forming porous solid bridges in the green sheets . Although fine powder is detrimental to the relative density of the green sheet, it possesses a higher surface energy, which provides a greater driving force for densification …”

“…The mechanism, detailed in Figure , involves one part of a chain molecule attaching to the particle surface, while the rest remains in the solvent and forms the thick solvated layer. Interactions of the solvated tails lead to entropic and/or enthalpic stabilization …”

“…Slurry solid loading at same viscosity varying with 5 kinds of powders modified by different amounts of coupling agent (after Ren et al)…”

“…42 Although fine powder is detrimental to the relative density of the green sheet, it possesses a higher surface energy, which provides a greater driving force for densification. [43][44][45] Decreasing the particle size resulted in an increase in the amount of dispersant required in both single and mixed powder systems. In the single powder system, the finer powder led to higher green densities.…”

“…Interactions of the solvated tails lead to entropic and/or enthalpic stabilization. 45 Ren et al 67 reported that weakly cationic polymeric amine (WCPA) uses both ionic repulsion and steric hindrance to stabilize slurries with non-aqueous solvents. The zeta-potentials of borosilicate glass-Al 2 O 3 suspensions at different pH values and with different relative sediment heights as a function of time are shown in Figure 8.…”