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Direct Writing of Dielectric Ceramics and Base Metal Electrodes
Author(s) -
Smay James E.,
Nadkarni Sarosh S.,
Xu Jian
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02118.x
Subject(s) - materials science , ceramic , colloid , ternary operation , dielectric , electrode , composite material , oxide , metal , chemical engineering , nanotechnology , metallurgy , optoelectronics , chemistry , computer science , engineering , programming language
Three‐dimensional structures were assembled by direct writing of colloidal gel‐based inks of electro‐ceramic and metal electrode compositions. The ternary mixtures of BaTiO 3 , BaZrO 3 , and SrTiO 3 were explored via an active mixing nozzle print strategy that allowed for rapid screening of complex oxide ceramics. In a second experiment, Ni and BaTiO 3 inks were developed from commercially available powders in the form of concentrated, aqueous colloidal gels having shear thinning with yield stress rheology. The different surface chemistry of Ni and BaTiO 3 was accommodated by adsorbing a bi‐layer of oppositely charged polyelectrolytes on the BaTiO 3 particles. Alternating layers of metal and ceramic were printed to build a multilayer structure. The multilayer Ni–BaTiO 3 structures were sintered in a reducing atmosphere and the capacitance was measured. These two examples illustrate the use of discrete or graded deposition capabilities of direct writing.