Resumen de Impedance spectroscopy evolution upon sintering of Al-rich anodising sludge-based extruded bodies
Joao Labrincha, M. J. Ribeiro, J.C. Abrantes
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.
