á-Fe /Nd_2Fe_(14)B nanocomposites for electromagnetic-wave-absorber in GHz microwave frequencies

摘要

Nd_5Fe_(92)B_3 alloy was induction-melted. The a-Fe compounded low content nanocomposites were prepared using a melt-spinning method, subsequent annealing treatment, and ball milling. The complex permittivity, permeability of composites was measured in the 0.5-18 GHz frequency range. The permeability spectra exhibits relaxation type characteristic. The á-Fe /Nd_2Fe_(14)B composites shows an excellent microwave absorption property (reflection loss: RL<-20dB) in 9-17GHz with thin matching thickness 1.6-2.5 mm, due to the cooperate effect of magnetic loss and dielectric loss. á-Fe /Nd_2Fe_(14)B nanocomposites are thought to be a good microwave absorbers in GHz microwave range.