Thermal properties and temperature distribution of epoxy composite with micro and nano AlN for molded transformer

摘要

In recent times, there has been an ever-growing need for epoxy based materials for electronic packaging applications. The aim of this study is to improve both thermal and electrical insulation properties of epoxy based composites using micro and nanocomposite techniques. This paper deals with the effect of adding micro and nano scale aluminum nitride on thermal and electrical properties of epoxy/silica microcomposite. Two kinds of specimens were prepared with containing micro and nano-fillers as a micro-composite and nano-composite. Experiments were carried out in epoxy composites with the particle dispersion techniques by applying ultrasonic wave and centrifugal force. Average particle sizes of the aluminum nitride used were 20um and 40nm. The content of powder in the samples was varied from 0.5 to 20 % by weight. The dispersion of aluminum nitride micro-, nano-particles and the morphology of the micro-, nano-composite samples were investigated by means of field emission scanning electronic microscopy (FE-SEM). The different models for predicting the thermal conductivity for two phase system are compared with experimental data of micro- and nano-sized aluminum nitride particles filled epoxy composite.