Impedance spectroscopy evolution upon sintering of Al-rich anodising sludge-based extruded bodies

• Autores: Joao Labrincha, M. J. Ribeiro, J.C. Abrantes
• Localización: Boletín de la Sociedad Española de Cerámica y Vidrio, ISSN 0366-3175, Vol. 45, Nº. 4, 2006, págs. 300-303
• Idioma: inglés
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• Resumen

  • 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.