Abstract
Alumina based ceramic materials, containing Al-rich sludge as the major component, were processed by extrusion. The sludge derived from the wastewater treatment of aluminium anodising industrial process. Long rods were produced using a vacuum screw extruder, by a careful control of all relevant processing parameters. Then, thick discs were obtained by cutting dried selected rods, to be tested as probes for sintering-dependent electrical properties. The sintering process was followed by performing common dilatometric/thermal analyses but the evolution of electrical conductivity, estimated by impedance spectroscopy ( S), was also used for this purpose. Results show that sintering-dependent morphological evolution up to 1300oC strongly affects the electrical behaviour of samples, and as a consequence S seems to be a useful technique to follow the firing process.
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