Preparation of barium ferrite microwave absorbing coating and its influencing factors study

Microwave absorbing coatings were made from the W-type barium ferrite (BaZn0.6Co1.4Fe16O27) powders prepared by the solid phase method. The effects of coating thickness, stirring time and ferrite content on the microwave absorbing properties of the coating were studied through performing the orthogonal experiment, and the optimal preparation conditions of the coating were predicted using Statistica8.0. According to the results of the orthogonal experiment, the barium ferrite coatings with a thickness of 1.81 mm, ferrite content of 75% (mass fraction) and stirring time of 0.5 h exhibit the best microwave absorbing properties, with all absorbing values beyond 10 dB in the frequency range of 8.2～18.0 GHz. In particular, the peak absorbing value at about 15.3 GHz reaches 33 dB. The optimal preparation conditions predicted by Statistica8.0 are consistent with those observed from the orthogonal experiment.