Microwave Absorption Properties of Highly Filled Polymer Composites with Amorphous Fe–B Particles

Abstract

In this study, polymer composites containing amorphous FeB particles with large particle size distribution were fabricated. A polymer composite of mixed particles showed a high relative permeability of ® 0 r = 9.3 at 1 GHz. In addition, the composite exhibited good microwave absorption properties (R.L. < ¹20 dB) in the frequency range of 0.61.1 GHz for absorber thickness of 2.44.2 mm. Thus, this polymer composite can be used for fabricating microwave absorbers that are effect in the 0.71.0 GHz band, and would result in microwave absorbers thinner than any other microwave absorbers reported to date.

Magnetic Properties of Amorphous Fe-B/Spinel-Ferrite Composite Particles Prepared by the Ferrite Plating Method

“…The particles are amorphous with crystallization temperature of 400 ~450ºC [7]. The detail of AFB particles is shown in previous works [4,7]. Fig.…”

“…To achieve such a decrease in thickness, highly-filled polymer composites of high-permeability particles are effective. Our group has reported that polymer composites with amorphous Fe-B (AFB) submicrometer particles show high relative permeability ( r ) and allow for MA [4]. Increasing volume faction of AFB particles is necessary to obtain polymer composites with higher  r for thinner MA.…”

Microwave absorption properties of amorphous Fe–B particle composites in K band

“…(b) The material's eddy current loss can be limited by reducing the size of the material and using a material with high resistivity. Fe-B and Fe-B-P amorphous particles with high saturation magnetization were reported by Kiyotaka Furuta and Kazuaki Shimba et al [14][15][16]. Inspired by research, submicron amorphous Fe-B particles with high saturation magnetization and resistivity may be suitable absorption materials for K band [15][16][17].…”