M-type barium ferrite ceramic microsphere core-shell-hollow structure microwave absorption materials

The M-type barium ferrite hollow ceramic microsphere microwave absorption materials were prepared with self-reactive quenching method. The Ni-Co composite layers were plated on the surface of the materials by using ultrasonic chemical electroless plating method. The materials had the core-shell-hollow structure. From the SEM, EDS and XRD analyzsis, the results show that the materials have middle hollow structure and its phase BaFe12O19 is M-type barium ferrite. The surface of the materials was plated with Ni-Co composite layers by using chemical electroless plating. From the test of microwave absorption property, after chemical electroless plating its microwave absorption properties were raised. The lowest reflection rate was -28.62 dB and the band width less than -10 dB was 3.33 GHz in the frequency range of 2-18 GHz when the thickness was 2.10 mm.