Development of Miniaturized High Energy Field Varistors

Abstract

This work explains the development of miniaturized high energy field surge arrestors
using micro-nano hybrid technologies. Varistor grade nanopowders were first synthesized
through a low temperature thermolysis technique. The nanopowders were used as additives to the
micron sized commercial varistor powders for obtaining composite varistors. Double stage
sintering conditions and microwave aging methods were effectively employed for obtaining dense
and fine grained varistors. The structural changes, evolution of microstructures, densification and
the electrical properties of these hybrid varistors were thoroughly investigated and assessed using
various crystallographic, microscopic and electrical analyses.