Abstract
Flakey FeSiAl/ferrite composites were prepared via ball milling-assisted co-precipitation to evaluate the microstructure, morphology, and microwave absorption. Measurement of the electromagnetic properties indicated that the permittivity and permeability of flakey FeSiAl composites can be well tuned by adjusting the amount of Ni-Zn ferrite loads. We found an extraordinary tunable dielectric-type loss that enhanced microwave absorption due to the interface between FeSiAl and ferrites. This enhanced microwave absorption of flakey FeSiAl composites is derived from the synergy of metal-ferrite interface and dielectric matching. Controlled by ferrite loads of 8 wt% content, enhanced microwave absorption is achieved with the reflection loss −29.2 dB and bandwidth 4 GHz at matching thickness 2.5 mm. Furthermore, the extraordinary tunable dielectric-type loss is thickness-independent. This promising result revealed a great opportunity for flakey FeSiAl/ferrite composites in microwave absorption applications.
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