Fabrication and Dielectric Properties of AlN Filled Epoxy Nano-composites

Epoxy resins were materials with excellent mechanical, electrical properties and good chemical stability. Thus, they had been used in various fields, especially in electrical and electronic application. However, because they were brittle material, the fields of application were limited. Adding nano-Aluminum Nitride (AlN) into Epoxy resins could improve the toughness of the composites, the thermal behaviors of composites could also be improved, but the influence on dielectric properties was not very clear. In this research, epoxy resin based composites were fabricated. The relationships between the dielectric properties and the nano-AlN particle content were investigated. The results showed that, both relative permittivity (epsilon(r)) and dielectric loss tangent (tan delta) decreased to be less than that of monolithic epoxy when nano-AlN particle content was no more than certain amount, the DC volume resistivity (rho(nu)) and low frequency resistivity decreased with increasing nano-AlN content (in certain range of content). AC breakdown strength (E-B) did not have an obvious tendency with nano-AlN content.