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The effect of urea–formaldehyde (UF) polymer concentration on porosity and average pore size of alumina membrane substrates prepared by gelcasting has been studied. The soluble UF oligomers formed in the initial stages of polymerization act as steric stabilizer for alumina particles in the suspension. The porosity and average pore size of the substrate samples decreased with both the decrease of amount...
Direct coagulation casting (DCC) of aqueous 8wt% yttria stabilized zirconia (YSZ) powder suspensions prepared using ammonium poly(acrylate) dispersant has been studied using MgO as coagulating agent. Small amount (<0.1wt% based on YSZ) of MgO powder dispersed in the YSZ powder suspension at ∼5°C set the suspension in to stiff wet-coagulated body when exposed to room temperature (30°C) due to the...
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