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Fabrication of Barium Strontium Titanate ( Ba 0.6 Sr 0.4 TiO 3 ) 3D Microcomponents from Aqueous Suspensions
Author(s) -
Olhero Susana M.,
Kaushal Ajay,
Ferreira José M. F.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12756
Subject(s) - materials science , aqueous solution , hydrolysis , chemical engineering , dispersant , barium , fabrication , dispersion (optics) , mineralogy , chemistry , organic chemistry , medicine , physics , alternative medicine , optics , pathology , engineering , metallurgy
This study reports on the fabrication of BST ( Ba 0.6 Sr 0.4 TiO 3 )‐based 3D microcomponents through an aqueous colloidal approach. The BST powder was synthesized by solid‐state reaction assisted by thermal analysis and XRD diffraction. Well crystalline cubic BST single phase was obtained upon heat‐treating the precursor powder mixture at 1200°C–1250°C. The reactivity of the BST powder toward water was evaluated by the changes in pH and concentration of leached ionic species along aging time. Hydrolysis reactions were suppressed by chemisorbing a suitable phosphate‐based protective agent and enabled an excellent dispersion ability to be achieved. Aqueous suspensions with solids loadings as high as 50 vol% that are stable against hydrolysis for several days could easily be prepared from the surface‐treated BST powder in aqueous solutions of an epoxy resin. After adding a suitable hardener, the colloidal suspensions could easily be cast into soft silicon rubber molds to obtain homogeneous and high dense green BST bodies.