Abstract
Dispersion characteristics of nanometer-sized BaTiO 3 powder in thirty-one kinds of non-aqueous solutions were evaluated by measuring the heights of cloudy layers in suspensions as a function of settling time. High dispersion state was maintained longer (100 to 500 h) in alcohols and cyclohexanone. The rheological behavior of alcohol and cyclohexanone BaTiO 3 suspensions was analyzed by the power law equation S= Kγ n , where S is the shear stress, K the consistency index, γ n is a constant. The green densities (34–54% of TD) of consolidated powder compacts were greatly influenced by the critical solid contents of colloidal solids at n = 0 which were estimated to be 17–42 vol%. The BaTiO 3 powder compacts with green densities above 57% TD, isostatically compressed after filtration, were densified to 94–96% TD after sintering at 1200°C for 2 h.
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