Method for preparing special cylindrical soft-magnetic-ferrite magnetic core

The invention belongs to the technical field of ferrite magnetic cores and discloses a method for preparing a special cylindrical soft-magnetic-ferrite magnetic core. The method comprises the steps ofmixing, powdery material filling, isostatic pressing treatment, trimming, sintering and aftertreatment, wherein an isostatic pressing gel mold is adopted during the isostatic pressing treatment and consists of a protective sleeve, a rubber tube, rubber plugs and cotter pins, the protective sleeve is arranged at the outer side of the rubber tube, the rubber plugs are plugged into the two ends of the rubber tube, and the cotter pins are arranged at the two ends of the protective sleeve and fix the rubber plugs to the rubber tube. By the method disclosed by the invention, the sintered soft-magnetic-ferrite magnetic core with the length-diameter ratio smaller than 10 can be obtained; the obtained sintered soft-magnetic-ferrite magnetic core has higher density; compared with the prior art, theobtained sintered soft-ma