Preparation method of ferrite material

Abstract

The invention discloses a preparation method of a ferrite material. The preparation method comprises the following steps: 1, preparing a ferrite pre-sintered material, and performing a wet crushing treatment on the ferrite pre-sintered material until the average particle size of the ferrite pre-sintered material reaches 0.2 to 0.5 micrometers; washing with 3mol / L HCl solution, and filtering to remove impurity ions, dissolved in the HCl solution, in the pre-sintered material; 2, adding the ferrite pre-sintered material into alkaline water, standing for 5 minutes and then filtering, washing withdeionized water, and then carrying out drying treatment until ferrite pre-sintered dry powder having a water content of less than 0.4wt% is obtained; carrying out vibration milling treatment on the ferrite pre-sintered dry powder for 30 minutes by using a vibrating mill so as to obtain ferrite pre-sintered powder subjected to vibration milling. The invention provides the preparation method of theferrite material.

Description

Technical field: [0001] The invention relates to a method for preparing a ferrite material. Background technique: [0002] At present, the forming methods of anisotropic sintered permanent magnet ferrite can be mainly divided into wet forming and dry forming. [0003] In wet forming, due to the presence of dispersion media such as water or ethanol, the ferrite particles are easy to rotate, and the ferrite particles are easy to arrange along the direction of easy magnetization in the magnetic field, which will make the formed ferrite obtain higher The degree of orientation, so wet-formed ferrite can obtain higher magnetic properties. However, wet molding needs to discharge the dispersion medium out of the mold cavity during press molding, so the productivity is low; in addition, wet molding has higher requirements for production equipment and higher production costs. [0004] In the existing dry molding, dry ferrite powder is directly filled into the mold cavity, and then p...

AI Technical Summary

Problems solved by technology

Compared with wet molding, since there is no dispersion medium, the friction between ferrite particles increases sharply, and the inevitable adhesion of ferrite particles occurs during the drying process, resulting in the arrangement of ferrite particles along the direction of easy magnetization The degree of the ferrite is significantly reduced, which will reduce the orientation degree of the formed ferrite, so the magnetic properties obtained by the dry formed ferrite in the prior art are poor