Effect of PAA-NH4 Dispersant on Dispersibility of Aqueous Pb(Zr, Ti)O3 Slurries and Piezoelectric Properties of Resultant Sintered Bodies
The effect of poly ammonium acrylate (PAA-NH4) dispersant on the dispersibility of Pb(Zr,Ti)O3 (PZT) slurries and the piezoelectric properties of resultant PZT sintered bodies was investigated for the establishment of environmentally friendly aqueous processing. The dispersion state and viscosity of PAA-NH4-added PZT aqueous slurries strongly depended on the slurry pH. Well-dispersed PZT slurries with negligibly small Pb2+ dissolution were obtained in the alkaline side due to the electrostatic steric hindrance effect of adsorbed polyelectrolyte dispersant molecules with a high dissociation ratio of carboxylic acid groups. The homogeneous dense microstructure and the enhancement of the piezoelectric properties of PZT ceramic bodies were achieved by preparing the aqueous PZT slurry with an optimum amount of dispersant.
Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata and Kazuo Shinozaki
M. Fujioka et al., "Effect of PAA-NH4 Dispersant on Dispersibility of Aqueous Pb(Zr, Ti)O3 Slurries and Piezoelectric Properties of Resultant Sintered Bodies", Key Engineering Materials, Vols. 421-422, pp. 103-106, 2010