Amorphous magnetic powder core and method for manufacturing the same

Abstract

The application provides an amorphous magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: (1) brittle heat treatment is performed on a Fe-based amorphous alloy, the amorphous alloy is broken and then pre-annealing treatment is performed to obtain amorphous powder, and two portions of the amorphous powder are taken and sieved through different sieves to obtain first powder and second powder; (2) the first powder and the second powder are mixed, and then MgO is used to perform magnetron sputtering treatment on the first powder and the second powder to obtain precursor powder; (3) surface modification treatment is performed on nano ferrite powder, the precursor powder and the surface-modified nano ferrite powder are mixed and ground, a binder is added for granulation, and then annealing treatment is performed after compression treatment to obtain the amorphous magnetic powder core. The amorphous powder / MgO / ferrite double-layer core-shell structure amorphous composite material is prepared by using the magnetron sputtering method and the mechanical ball milling method, and the prepared magnetic powder core has high permeability, low power loss and good direct current superposition performance.