Abstract
This research is concerned with properties of 0.5BZT-0.5BCT through a water based gel casting process by using Ethylene Glycol Diglycidyl Ether (EGDGE) epoxy resin as a gelling agent. A solution of an ammonium salt of an acrylic polymer in water (NH4PAA) was used as an additive in order to make the dispersion of the powders easier and provide better stability of the slurry and dispersant. The results were found that viscosities of the 0.5BZT-0.5BCT with EGDGE epoxy resin was minimised by the addition of 1.6 wt% of dispersant based on the dried powder weight. The highest green strengths of around 25 MPa were achieved at 30 wt% EGDGE resin content and 44 vol% solids loading. The gel casting samples were studied at sintering temperatures between 1300-1500 °C. The highest values of piezoelectric and dielectric properties corresponded to 0.5BZT-0.5BCT gel casting samples fabricated with a gel casting slurry incorporating 30 wt% EGDGE resin content, 44 vol% solids loading and sintered at 1500 °C, with d33 and εr values of 310 pC/N and 2515, respectively.
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