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Processing multi-channel alumina membranes by tape casting latex-based suspensions
journal contribution
posted on 2007-01-23, 11:41 authored by Yongheng Zhang, Chengwei Qin, J.G.P. BinnerTape casting has been used to produce thin, multi-channel alumina ceramic membranes using aqueous-based suspensions with latex as the
binder. Three different kinds of latex binders, vinyl/acrylic, vinyl acetate/acrylic and acrylic/styrene latexes, each plasticized with dibutyl-ophthalate
or glycerol, were evaluated in terms of their slurry rheology and green tape mechanical properties. The results showed that the
different binder systems had a substantial effect on the rheology of the system as a function of the dispersant concentration; the acrylic/styrene
system proving to be the most useful. As a plasticizer, glycerol was not found to be effective; however, dibutyl-o-phthalate was much more
successful, particularly in the acrylic/styrene system where it enabled the strain-to-failure of the green tape to be doubled with only a modest
decrease in tensile strength. As expected, both binder content and sintering temperature significantly affected the final porosity and fracture
strength of the ceramic membranes; 15 wt.% binder and a sintering temperature of 1500 8C were found to yield a membrane with a porosity of
~40% and strength of ~95 MPa. Simple multi-channel substrates could be easily assembled by bonding strips of the green tapes together with
the ceramic slurry. Adhesion between the tapes was excellent with no interface being observed and on sintering no warping or deformation
occurred.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Pages
851806 bytesCitation
ZHANG, Y., QIN, C. and BINNER, J.G.P., 2006. Processing multi-channel alumina membranes by tape casting latex-based suspensions. Ceramics International, 32, pp. 811-818Publisher
© ElsevierPublication date
2006Notes
This is Restricted Access. This article was published in the journal, Ceramics International [© Elsevier] and is available at: http://www.sciencedirect.com/science/journal/02728842.ISSN
0272-8842Language
- en