LAUSR

Abstract In this study, flaky Fe95Si1B2P0.5Cu1.5 powders with a particle size of 48–75 μm were compounded with graphene (GR) by high-energy ball milling to prepare GR/Fe95Si1B2P0.5Cu1.5 composite powders. The electromagnetic parameters of GR/Fe95Si1B2P0.5Cu1.5 composite powders in the frequency band of 0.3–8.5 GHz were determined by a vector network analyser. The influence of milling time and graphene content on the electromagnetic parameters of GR/Fe95Si1B2P0.5Cu1.5 composite powders was studied. The results showed that with the increase of graphene content, magnetic permeability and dielectric constant increase simultaneously. The 1.0 wt% GR/Fe95Si1B2P0.5Cu1.5 composite powders prepared by milling for 24 h exhibited the best absorbing property. In the frequency band of 0.3–8.5 GHz, for 1.0 wt% GR/Fe95Si1B2P0.5Cu1.5 composite, the dielectric constant was 182.4–18.2, and the magnetic permeability was 7.3–1.0. The dielectric loss tangent was 3.40–6.60, the magnetic loss tangent was 0.48–3.46, and their sum was 5.28–8.60; therefore, 1.0 wt% GR/Fe95Si1B2P0.5Cu1.5 composite exhibited excellent absorbing properties.