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Stability of Aqueous Barium Titanate Suspensions for MLCC Inkjet Printing
Author(s) -
Beaudrouet Eloi,
Vivet Aurélien,
Lejeune Martine,
Santerne Claire,
Rossignol Fabrice,
DossouYovo Chrystelle,
Mougenot Marion,
Noguera Rémi
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.12729
Subject(s) - materials science , dispersant , barium titanate , dielectric , ceramic capacitor , chemical engineering , aqueous solution , ceramic , fabrication , hydrolysis , composite material , nanotechnology , capacitor , dispersion (optics) , chemistry , organic chemistry , optoelectronics , medicine , physics , alternative medicine , pathology , quantum mechanics , voltage , optics , engineering
BaTiO 3 ‐based materials are currently used for the fabrication of multilayer ceramic capacitors ( MLCC ) because of their high dielectric properties. The inkjet printing ( IJP ) process can be used to fabricate MLCC of complex configurations by integrating internal electrodes and dielectric layers in a single step using a multi printing‐head system. Stabilized aqueous suspensions of BaTiO 3 ‐based powders are required to obtain dielectric inks adapted to IJP . This study investigates the influence of BaTiO 3 powder hydrolysis in water on the surface chemistry and stability in relationship with the milling step used to adjust the powder grain size to IJP . Optimum parameters for a good stability of BaTiO 3 suspensions are identified. The selected dispersant is a polyacrylate ( PAA ) for which the content is adjusted to minimize the sedimentation rates as required by IJP . Moreover, the addition of ethylene glycol is shown to be necessary to avoid the formation of a gel structure which could result from the interaction of borates ions leached from the surface of BaTiO 3 with the PAA dispersant. A mechanism of gel formation is proposed.