Effects of Co content on microwave absorbing properties of Dy–Ni powder

Abstract

Abstract DyNi2- x Co x (x = 0, 0.4, 0.6 and 0.8) absorbing powders were prepared using a non-consumable vacuum melting furnace and a high energy ball milling method. The effects of Co content on the microstructure and the absorbing properties of DyNi2 powders were investigated by X-ray diffraction, scanning electron microscopy and vector network analysis. The absorbing properties of DyNi2 powders were optimized, but did not affect the composition of DyNi2 alloy with increasing Co content. With the addition of Co, the ∊″ formant frequency, μ″ formant frequency and reflection loss peak frequency of the powders shifted to higher values. The minimum reflection loss peak of DyNi1.4Co0.6 powder is about −30.65 dB with a coating thickness of 1.8 mm, and a bandwidth where R < −10 dB is 1.9 GHz.