Abstract
Spherical SiO2 and Al2O3 fillers were synthesized by ultrasonic spray pyrolysis. The particles characteristics of these fillers were studied by SEM, TEM, XRD and a pycnometer. Crysalline state of both as-prepared fillers was amorphous. The morphology of SiO2 fillers was maintained at up to 900°C . The morphology of SiO2 fillers was changed to irregular shape after crystallization of cristobalite at 1100°C. On the other hand, the morphology of Al2O3 was retained after crystallization of α-alumina at 1100°C. By the surface modification of these fillers with a silane coupling agent, the composite materials of epoxy resin and fillers was successfully prepared. The Vickers hardness and thermal conductivity of composite materials were investigated. The use of fillers with a broad particle size distribution and spherical morphology led to an improvement in the packing fraction of fillers, Vickers hardness and thermal conductivity.
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