The thermal conductivity and electrical strength of epoxy resin with different filler content of micro and nano alumina

Epoxy resin is widely used in high voltage apparatus, electrical machines etc due to its excellent mechanical, electrical and chemical properties. Great progress has been made in application on electrical insulation, casting and potting. The epoxy resin containing nano-size and micro-size Al₂O₃ of various contents are prepared. The purpose of efforts we engaged in is to study the efforts of nano Al₂O₃, micro Al₂O₃ and nano-micro Al₂O₃ on the characteristics of epoxy resin on electrical and thermal properties. The epoxy resin(UVR6105) is used as the base material and Methyl six hydrogen anhydride is used as the curing agent. Various nanocomposites, microcomposites and nano-microcomposites are prepared and fabricated properly through three roller grinding machine. Breakdown strength experiments are done through JNC801 breakdown voltage tester. Nano Al₂O₃ enhances the electrical characteristics of epoxy resin on breakdown strength while micro Al₂O₃ lowers it. The thermal properties of thermal conductivity of the epoxy resin are tested through LFA477. The thermal conductivity of epoxy resin is increasing with the filling contents of the Al₂O₃ while there is a comparatively lower value if nano Al₂O₃ is added due to its high thermal interface resistance between epoxy resin and Al₂O₃.