In this research, the electrical and thermal properties of glass matrix composites filled with different amounts of aluminium titanate (Al2TiO5) powder varying from 5 to 15 wt. % have been investigated. In order to optimize the processing route, some sintering strategies were tested. The densest specimens were obtained by less pressure of the sintering. The composites were characterized by means of SEM micrography, X-ray diffraction (XRD), differential thermal analysis (DTA), dilatometry and impedance spectrometry. XRD results showed that the main crystallization phases were Wollastonite, Aluminium titanate, Rutile, and Alumina in all sintered glass matrix composites. It was also revealed that addition of 15 wt.% aluminium titanate has increased the relative density and decreased thermal expansion coefficient (TEC) (6.9×10-6/ºC) and electrical conductivity (3.1×10-4 in comparison with other composites. The results would be explained considering nature and concentration of the formed crystalline phases and their micro-structures.

Maryam Kargar Razi, Reza Tayebee, Atusa Ahmadi and Parvin Alizadeh