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Rheological behavior of alumina water-base suspension and properties of green sheets was investigated. In the case of 0.6μm alumina, the suspension showed shear thinning flow behavior at 0.7Pa yield stress, suggesting that the alumina particles are partially flocculated. On the other hand the suspension of 1.7μmalumina showed a behavior close to Newtonian flow, suggesting that the alumina particles are well dispersed. Through the adsorption isotherm measurement of binder on alumina particles, each binder molecule is estimated to occupy 19.6nm2 and adsorbs on the alumina surface with stretched conformation like'tail'or'loop'in both cases. The critical solid content of 0.6μm alumina suspension measured by additional vaporization method was smaller than that of 1.7μmalumina suspension. This is the same tendency as the result that the packing density of 0.6μmalumina green sheet was smaller than that of 1.7μm alumina green sheet. The non-adsorbed binder in suspension is found to accumulate between alumina particles and affect the tensile properties of green sheets after drying.

Rheological Behavior of Alumina Water-base Suspension and Properties of Green Sheets