Abstract
Colloid processing of transparent yttria ceramics has been reported in this work. Aqueous suspensions of nano yttria powder were prepared by dispersing commercial powder into deionized water with triammonium citrate (TAC) as the dispersant. Effects of adsorbed dispersant, pH of suspending medium and solid loadings on the stability of the suspensions were characterized by means of sedimentation test, Zeta potential and viscosity measurements. Addition of 1.0 wt% TAC was enough to stabilize Y2O3 suspensions. The prepared colloidal suspensions with 15vol% solid loadings were subsequently consolidated into green compacts via centrifugal casting and the transmittance of the sample sintered in vacuum was measured. Ceramics prepared has an highest in line transmittance of~55% at 800 nm . Index Terms—yttria, transparent ceramics, colloidal processing
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