Electrical characterization of mullite bodies containing Al-rich anodizing sludge
authors Ribeiro, MJ; Abrantes, JCC; Labrincha, JA
editors Vilarinho, PM
nationality International
journal ADVANCED MATERIALS FORUM III, PTS 1 AND 2
author keywords mullite waste-based materials; impedance spectroscopy; microstructural development; percolation limit
keywords CERAMIC BODIES; ALUMINA; MIXTURES; SILICA
abstract Al-rich sludge produced from industrial anodising and surface treatment processes had been tested in the fabrication of mullite-based materials, by using unidirectional dry pressing as shaping technique. Mixture with common natural silica and magnesium-containing materials, like ball clay, kaolin and diatomite were prepared in order to achieve interesting final fired refractory and/or electrical insulating materials. Microstructural changes upon sintering and crystalline phase evolution are detailed and their relationship with the electrical behaviour is also studied, by the use of impedance spectroscopy. Finally, different models were used to fit the experimental electrical resistivity values and to estimate the percolation limit of the bi-phase material.
publisher TRANS TECH PUBLICATIONS LTD
issn 0255-5476
year published 2006
volume 514-516
beginning page 1726
ending page 1730
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000238056400341

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