Preparation method of high-performance ferrite

Abstract

The invention relates to the technical field of magnetic materials, and discloses a preparation method of high-performance ferrite. The method comprises the following steps: 1, carrying out high-temperature pretreatment on raw materials; 2, weighing ingredients, and carrying out wet grinding and disintegration; 3, dehydration treatment: dehydrating the mixed material obtained in the step 2 through a horizontal centrifuge to obtain slurry with the solid content of 67 wt%; 4, presintering step by step; 5, crushing and ball-milling: crushing the pre-sintered material obtained by step-by-step pre-sintering in the step 4 by dry ball-milling, adding a dispersing agent, carrying out secondary ball-milling, and continuously carrying out ball-milling for 18 hours to obtain slurry; step 6, molding; and 7, sintering: carrying out heat treatment on the molded body obtained in the step 6 at 200 DEG C to remove moisture. The preparation method of the high-performance ferrite has the advantages that a phase molecular formula Sr(1-a-2b-c-d)CaaPrbNdbLacGddFe(2n-x-y) CoxZnyO19 is used as a proportion, and the performance that the residual magnetism of the permanent magnetic ferrite is greater than or equal to 4550 Gs and the intrinsic coercive force is greater than or equal to 5500 Oe is realized through high-temperature pretreatment of raw materials, wet grinding and crushing, step-by-step presintering and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of high-performance ferrite. Background technique [0002] In today's society, with the rapid development of the electronics industry, the demand for magnetic materials is increasing. Although my country is a major producer of magnetic materials, there is still a gap in the dimensional accuracy and performance grades of our products compared to developed countries. As A kind of magnetic material, permanent magnet ferrite is the most widely used magnetic material at present, especially high-performance permanent magnet ferrite material is the basic functional material of contemporary society and its development. With the miniaturization of various electronic and electrical products, With the development trend of thinner and lighter, the performance requirements of ferrite are getting higher and higher. [0003] At present, the existing strontium bari...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing high-performance ferrite, which has the phase molecular formula Sr(1-a -2b-c-d)CaaPrbNdbLacGdd Fe(2n-x-y)CoxZnyO19 is the ratio, through raw materials High-temperature pretreatment, wet grinding and crushing, step-by-step pre-burning, etc., realize the advantages of permanent magnet ferrite remanence ≧ 4550 Gs and intrinsic coercive force ≧ 5500 Oe, which solves the current problems of strontium barium ferrite and Calcium-lanthanum-cobalt ferrites developed based on ion substitution technology at home and abroad are not enough to meet the increasingly high requirements of the miniaturization of electronic products on the magnetic properties of permanent magnet ferrites, and the highest residual magnetism ≧ 4500 Gs is still not possible. The problem of the performance of stubborn force≧5500 Oe

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