Electrophoretically Deposited Porous Ceramics and their Characterisation by X-Ray Computer Tomography

Abstract:

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Planar zirconia green bodies with unidirectionally aligned pore channels were prepared by an electrophoretic deposition method using an effect which is usually disadvantageous for the EPD from aqueous suspensions: the formation of gas bubbles by electrolysis. Aqueous ZrO2 suspensions containing acetic acid to enable a sufficient gas generation were used for the EPD experiments. The influence of selected parameters – electrolyte content, applied voltage, and kind of deposition electrode – on the pore structure has been investigated. The green bodies were sintered at 1450 °C in air. Optical microscopy and X-ray computer tomography (CT) were used for characterising the porous structures. CT-investigations have the advantage of a three-dimensional characterisation of the samples by a non-destructive method. The resulting pore structure depended to a high degree on the experimental conditions of the EPD. The kind of the deposition electrode – platinum foil or platinum gauze on foil – had a strong influence on the arrangement of the pores. The EPD on Pt-foil led to randomly arranged pores, whereas very regular pore structures were obtained by the use of Pt-gauze.

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Periodical:

Edited by:

A. R. Boccaccini, O. van der Biest, R. Clasen, T. Uchikoshi

Pages:

255-260

DOI:

10.4028/www.scientific.net/KEM.412.255

Citation:

K. Moritz and T. Moritz, "Electrophoretically Deposited Porous Ceramics and their Characterisation by X-Ray Computer Tomography", Key Engineering Materials, Vol. 412, pp. 255-260, 2009

Online since:

June 2009

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$35.00

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