Preparation method of ferrite permanent magnet material with ultrafine crystal structure

A ferrite permanent magnet and ultra-fine grain technology, applied in the field of magnetic materials, can solve the problems of ferrite material price increase, and achieve the effects of reducing material costs, saving resources, and high coercive force

Active Publication Date: 2019-11-29
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to overcome the problem that the price of ferrite materials is greatly increased due to the replacement of La-Co ions in the prior art, and provides

Method used

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  • Preparation method of ferrite permanent magnet material with ultrafine crystal structure

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Example Embodiment

[0032] Example 1

[0033] The preparation method of the ferrite permanent magnet material with ultrafine grain structure comprises the following steps:

[0034] 1) iron oxide and strontium carbonate are mixed by ball mill, and the ball milling medium selects deionized water, and the addition of deionized water is 20wt% of the total amount of iron oxide and strontium carbonate, so that it is uniformly dispersed to obtain a mixture, wherein iron element and strontium The mass ratio of the elements is 12:1;

[0035] 2) drying the mixture and crushing to obtain dry powder, adding calcium permanganate, the addition amount of calcium permanganate is 0.5wt% of the dry powder, and mixing is uniform;

[0036] 3) Pre-sintering is carried out at 850° C. to obtain a pre-sintered material with ultra-fine grains, and the grain size of the pre-sintered material is 0.5 μm;

[0037] 4) The pre-sintered material is roughly crushed to obtain a coarse powder with a particle size of 5 μm, and th...

Example Embodiment

[0039] Example 2

[0040] The preparation method of the ferrite permanent magnet material with ultrafine grain structure comprises the following steps:

[0041] 1) iron oxide and strontium carbonate are mixed by ball mill, and the ball milling medium selects deionized water, and the addition of deionized water is 20wt% of the total amount of iron oxide and strontium carbonate, so that it is uniformly dispersed to obtain a mixture, wherein iron element and strontium The mass ratio of the elements is 12:1;

[0042] 2) drying the mixture and crushing to obtain dry powder, adding calcium permanganate, the addition of calcium permanganate is 1wt% of the dry powder, and mixing is uniform;

[0043] 3) Pre-sintering is carried out at 850° C. to obtain a pre-sintered material with ultra-fine grains, and the grain size of the pre-sintered material is 0.5 μm;

[0044] 4) The pre-sintered material is roughly crushed to obtain a coarse powder with a particle size of 5 μm, and the mixture...

Example Embodiment

[0046] Example 3

[0047] The preparation method of the ferrite permanent magnet material with ultrafine grain structure comprises the following steps:

[0048] 1) iron oxide and strontium carbonate are mixed by ball mill, and the ball milling medium selects deionized water, and the addition of deionized water is 20wt% of the total amount of iron oxide and strontium carbonate, so that it is uniformly dispersed to obtain a mixture, wherein iron element and strontium The mass ratio of the elements is 12:1;

[0049] 2) drying the mixture and crushing to obtain dry powder, adding calcium permanganate, the addition of calcium permanganate is 1.5wt% of the dry powder, and mixing is uniform;

[0050] 3) Pre-sintering is carried out at 850° C. to obtain a pre-sintered material with ultra-fine grains, and the grain size of the pre-sintered material is 0.5 μm;

[0051] 4) The pre-sintered material is roughly crushed to obtain a coarse powder with a particle size of 5 μm, and the mixtu...

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Abstract

The invention relates to the technical field of magnetic materials, and discloses a preparation method of a ferrite permanent magnet material with an ultrafine crystal structure. The preparation method comprises: 1) uniformly mixing and dispersing iron oxide and strontium carbonate through ball milling to obtain a mixture; 2) drying the mixture, breaking to obtain dry powder, adding a metal salt or/and oxide with oxidability, and uniformly mixing; 3) pre-firing to obtain a pre-fired material with ultrafine grains; 4) performing coarse breaking on the pre-fired material to obtain coarse powder,adding a mixture AwBxCyDz into the coarse powder, and performing ball milling to obtain fine powder; and 5) performing pressing molding on the fine powder, and sintering. According to the present invention, the prepared ferrite permanent magnet material can obtain extremely high magnetic performance in the absence of La-Co elements.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a ferrite permanent magnet material with an ultrafine grain structure. Background technique [0002] Ferrite permanent magnet materials are rich in raw materials, cheap, and have the advantages of high temperature resistance and corrosion resistance, so they are widely used in the field of motors and sensors. The disadvantage of ferrite permanent magnet materials is that their magnetic properties are low. In order to improve their magnetic properties, people often use La-Co ions instead. Through this method, the magnetic properties of the ferrite material can be greatly improved. However, La is a rare earth element with limited reserves; while cobalt is a strategic resource, mainly produced in South America, Africa and Oceania, and the price is very expensive. Therefore, the substitution of La-Co ions will cause a substantial increase in the pr...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2633C04B35/622C04B2235/3201C04B2235/3212C04B2235/3213C04B2235/3268C04B2235/3284C04B2235/3418C04B2235/785
Inventor 李玉平包大新何震宇李军华吴云飞
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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