Microwave absorbing performance of RE-Fe based alloys

Abstract

RE₁₃Fe₈₄Cr₃(RE=Ce, Pr, Tb, Er) and Pr_13−xFe₈₄Cr₃Ti _x(x=0, 2, 4, 6) alloy powders were prepared by arc smelting method and high energy ball milling technique. The phase structure and the morphology of the alloy powders were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and their microwave absorbing properties were determined by a vector network analyzer. The results show that the alloys with light rare earths (Ce, Pr) have good low frequency absorbing property and those with heavy rare earths (Tb, Er) exhibit an improved high frequency absorbing property. The minimum reflectivity at the absorbing peak frequency of RE₁₃Fe₈₄Cr₃(RE=Ce, Pr, Tb, Er) are −9.49 dB at 5.76 GHz, −22.38 dB at 7.92 GHz, −18.52 dB at 11.68 GHz and −17.59 dB at 10.24 GHz, respectively. The absorbing bandwidth under −10 dB of the Pr₁₃Fe₈₄Cr₃ powder was widened from 1.91 GHz to 3.89 GHz by adding 2% Ti, but the reflectivity of the alloy was increased from −22.38 dB to −14.91 dB.

Keywords

RE-Fe based alloys / microwave absorbing property / reflectivity / electromagnetic parameter / high energy ball milling

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