Utilization of Fly Ash - A Waste Byproduct of Coal for Shielding Application

Abstract

A matrix having conducting, magnetic and dielectric filler, due to their unique attenuation and electrical properties have shown their potential application in electromagnetic interference (EMI) shielding. However, the difficulties of reflection of microwave are yet to be overcome. Recently, exfoliated graphite along with iron oxide and fly ash found to a better alternate to the conventional shielding materials. Conductivity of composites lies in the range 0.013"14.57 S/cm. The microwave absorption properties of the composites have been studied in the 8.2-12.4 GHz (X”Band) frequency range which shows a shielding effectiveness up-to 59.83 dB, which strongly depends on dielectric loss and weight fraction of fly ash and γ-Fe2O3 in EG matrix.