Preparation and Characterization of Barium Titanate Suspensions for Stereolithography

Abstract

Ferroelectric photoactive suspensions for stereolithography have been developed by dispersing a high volume fraction of barium titanate powder in hexanediol diacrylate (HDDA) with the aid of effective photoinitiators and dispersants. Rheological properties showed a shear thinning behavior and a low viscosity at a shear rate adequate for the recoating process. The barium titanate-HDDA suspension showed poor curing behavior due to the large refractive index difference between the ceramic and the resin. The coarse barium titanate-HDDA suspension showed a smaller surface reflectance and a larger cure depth than the fine barium titanate-HDDA suspension.

Fabrication of barium titanate by binder jetting additive manufacturing technology

“…Even when research has been pursued to improve dielectrics such as barium titanate, attempts have been made via 3D printing for this material like the use of inkjet printing to create capacitors with a low volume of polymer ink [13], and the fabrication of 3D piezoelectric BTO nanoparticles embedded in a polyethylene glycol diacrylate matrix by digital projection printing where d 33 values of 40 pC/N were obtained for a maximum particle loading of 10wt% [14] [15]. Also, fabrication of ferroelectric photoactive suspensions by stereolithography has been reported for maximum BTO ceramic volume of 40% in hexanediol diacrylate, which proved to have poor curing behavior due to the difference on surface reflectance of the ceramic and the resin used [16].…”

High solids loading ceramic colloidal dispersions in UV curable media via comb-polyelectrolyte surfactants

“…Nanometer and submicrometer ceramic particles are advantageous for high resolution microstructures, surface quality and reduced sintering temperatures. Although few particle types can be efficiently dispersed in organic UV curable monomer mixtures [10], special surfactants are frequently needed to increase particle solids loading to the levels required for ceramic processing (>40 vol%) [2,[4][5][6][7][8][9].…”

“…Stereolithography relies on relatively UV transparent dispersions having viscosities lower than 5 Pa s (30 1/s) [1]. Numerous studies of dispersions of micrometer and submicrometer powders in organic and aqueous media have been made [1][2][3][4][5][6][7][8][9]. Organic systems are advantageous due to the wide choice of monomers and oligomers for composite formulation and fast curing.…”

Experimental studies on 3D printing of barium titanate ceramics for medical applications

“…This is where additive manufacturing comes into play. There have already been investigations regarding the fabrication of BaTiO 3 (BTO) via additive manufacturing [6][7][8], which are addressed in these studies. Besides the production via stereolithography processes, the direct fabrication via 3D printing (3DP) is described.…”