Impedance Spectroscopy Evolution upon Sintering of Alumina Bodies Containing Al-Rich Anodizing Sludge

Abstract:

Al-rich sludge produced from industrial anodising and surface treatment processes had been tested in the fabrication of alumina-based materials, by using plastic extrusion as shaping technique. 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 common dilatometric/thermal analyses and results were interrelated with the evolution of electrical conductivity, estimated by impedance spectroscopy technique (IS). Results show that sintering-dependent morphological evolution up to 1300°C strongly affects the electrical behaviour of samples, and as a consequence IS seems to be a useful method to follow the firing process.

• Periodical: Materials Science Forum (Volumes 636-637)
• Pages: 91-97
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.636-637.91
• Online since: January 2010
• Authors: M.J. Ribeiro, J.A. Labrincha
• Keywords: Al-Rich Sludge, Alumina-Recycled Material, Electrical Behaviour, Impedance Spectroscopy

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