Aqueous dispersion characteristics of PMN-PT powder prepared by partial oxalate route

Abstract

Aqueous dispersion of PMN-PT powder prepared by partial oxalate process has been studied using ammonium poly(acrylate) dispersant. Parameters such as dispersant concentration and pH to achieve well dispersed suspensions have been determined by measurement of viscosity and gravitational sediment density. Suspension with PMN-PT powder loading in the range of 50 to 58 vol.-% showed very low viscosity in the range of 0·125–0·325 Pa s at a shear rate of 93 s⁻¹. The suspensions are shear thinning and obey Casson model. PMN-PT powder suspensions of solids loading in the range of 50 to 58 vol.-% showed yield stress in the range of 0·625 to 9·5 Pa respectively. The green body prepared by casting the suspensions in an open mould followed by drying in air showed high density (63·4% TD) and narrow pore size distribution with a median pore size of 0·14 μm.

Keywords

PMN-PT POWDER SUSPENSION DISPERSION VISCOSITY PORE SIZE

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