Binary solvent mixture for tape casting of TiO2 sheets.pdf

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Binary solvent mixture for tape casting of TiO2 sheets.pdf

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Binary solvent mixture for tape casting of TiO2 sheets

Binary solvent mixture for tape casting of TiO2 sheets Zhang Jingxiana,*, Jiang Donglianga, Lars Weisenselb, Peter Greilb aShanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, Ding-Xi Road, 200050, PR China bUniversity of Erlangen-Nuremberg, Department of Materials Science, Glass and Ceramics, Martensstr. 5, D-91058 Erlangen, Germany Received 4 November 2002; received in revised form 12 April 2003; accepted 27 April 2003Abstract Four azeotropic binary solvent mixtures based on ethanol/methyl ethyl ketone, ethanol/toluene, isopropanol/methyl ethyl ketone and isopropanol/toluene were studied for the dispersion of TiO2 powders. Two different polyvinyl butyral polymers (PVB79 and PVB98) were selected as dispersant and as binder and dibutyl phthalate (DBP) was used as plasticizer. The dispersability of TiO2 suspensions was characterized by rheological measurements and sedimentation tests. After tape casting, the properties of Green tapes were tested in term of density, surface roughness and strength. Results showed that azeotropic EtOH/MEK mixture is the effective solvent system for tape casting of TiO2 sheets. The TiO2 tapes served for multilayer ceramic/metal composite manu- facturing. # 2003 Elsevier Ltd. All rights reserved.Keywords: Rheology; Slurry; Tape casting; TiO21. Introduction Tape casting is an established method for manu- facturing wide and flat sheets of ceramic materials. Most applications of tape casting technology refer to the electronic industry, while some authors have also used this technique for obtaining thin ceramic sheets and multilayered structures for different application such as solid oxide fuel cells or laminated composites.15 A tape casting slurry is a complex system in which each component has a substantial effect on the slurry prop- erties. To obtain a reliable processing of high quality products, a homogeneous dispersion of ceramic parti- cles is highly required.514 Stable suspensions are achieved by polymer steric sta