Study of the Dielectric Dispersion Phenomena for Al2O3/Al Cermet Composite at Room Temperature

Abstract

A cermet composite Al₂O₃/Al had been prepared in different concentrations of Aluminum metal (0, 10, 20, 30, 40, 50) Wt%, the samples have been formed at pressures (50, 100, 150) bar into pellets with diameter (15) mm and thickness (4) mm by cold pressing, the sintering temperature 800 °C for 2 hrs. in vacuum,  physical, microstructure, dielectric properties were studied, physical tests showed that as the concentration of Al increased, the practical density decreased and the porosity decreased also specially at the region of concentration from 40% to 50% of Al, the microstructure shows the liquid phase is happening, dielectric measurement shows that the dielectric constant, loss factor and loss tangent were decreased as increasing frequency.

Keywords: Cermet, Alumina, Compaction Behavior, Dielectric dispersion.