Method for manufacturing sintered iron strontium oxide permanent magnetic material

Abstract

The invention relates to a method for manufacturing a sintered iron strontium oxide permanent magnetic material, comprising the following steps of: preparing materials, wherein raw materials comprise 84.4-87.05 percent of Fe2O3 with purity higher than 99 percent and 12.95-15.60 percent of SrCO3 with the purity higher than 97 percent, as well as 0.05-0.4 percent of industrial pure silicon dioxide and 0.05-0.3 percent of industrial pure alumina or chromic oxide relative to the total charge weight, and the raw materials are powdery with the particle mean size smaller than 1 micron; and carrying out the steps of strong dry-type mixing, continuous dry-type sanding, palletizing, screening and sintering on the prepared powdery materials to obtain the sintered iron strontium oxide permanent magnetic material. The manufacturing method of the invention can ensure that various raw materials are uniformly mixed, refined and closely contacted so that the sintered iron strontium oxide permanent magnetic material with higher property can be obtained, and can ensure that material pellets are smaller in sphere diameter and narrower in dimensional range so that the sintering time is shortened, the production efficiency is improved and the energy consumption is reduced, and moreover, the manufacturing method is simple in process and has no pollution to the environment.

Description

technical field [0001] The invention relates to a method for manufacturing a magnetic material, in particular to a method for manufacturing a sintered strontium ferrite permanent magnet material. Background technique [0002] The formation of ferrite is the result of solid-state reaction between the powder particles of each component. To obtain ferrite whose chemical composition strictly conforms to the formula, the uniform mixing of raw materials and the close contact between raw materials are very critical. At present, the manufacturing methods of sintered strontium ferrite permanent magnet materials can be divided into wet process manufacturing method and dry process manufacturing method according to the mixing method. The wet process manufacturing method is to make various raw materials into slurry, mix and sinter through wet ball milling or sand milling, so as to ensure that various raw materials are mixed evenly and can obtain high-performance sintered strontium ferrit...

AI Technical Summary

Problems solved by technology

The wet process manufacturing method is to make various raw materials into slurry, mix and sinter through wet ball milling or sand milling, so as to ensure that various raw materials are mixed evenly and can obtain high-performance sintered strontium ferrite permanent magnet materials, but This process has the defect of high water content in the slurry, which results in high energy consumption; the dry process manufacturing method refers to the use of a dry strong mixer to mix various raw materials in a certain proportion, pelletize and sinter. Factors such as agglomeration of raw materials and poor fluidity lead to poor mixing uniformity and consistency, which ultimately affect the performance of strontium permanent magnet ferrite

Moreover, the sintering time of the existing dry process for manufacturing sintered strontium ferrite permanent magnet materials generally takes 4-8 hours, and the sintering time is long, so the energy consumption is large

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