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Permanently magnetic strontium ferrite material and preparation method thereof

A strontium ferrite and permanent magnet technology is applied in the field of rapid sintering of permanent magnet strontium ferrite materials after moisture removal, permanent magnet strontium ferrite magnetic materials and their wet forming manufacturing fields, which can solve the problem of high energy It can overcome the problems of energy consumption, poor magnetic properties and crystal structure of sintered ferrite, and achieve the effect of overcoming energy saving and improving structure and magnetic properties.

Inactive Publication Date: 2010-10-27
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a new microwave sintering preparation method for the problems of high energy consumption in the preparation of the above-mentioned permanent ferrite magnetic material, poor magnetic properties and crystal structure of sintered ferrite, etc.

Method used

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  • Permanently magnetic strontium ferrite material and preparation method thereof
  • Permanently magnetic strontium ferrite material and preparation method thereof
  • Permanently magnetic strontium ferrite material and preparation method thereof

Examples

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Embodiment 1

[0032] A method for preparing a permanent magnet strontium ferrite material by a microwave sintering process, comprising the following steps:

[0033] (1) The strontium-containing ferrite calcined material is mixed with the secondary additives in a ball mill. After wet ball milling, the average particle size of the slurry reaches 0.6um, and then it is dehydrated and separated. The moisture content of the dehydrated slurry is required. at 25%;

[0034] The auxiliary agent added for the second time is CaCO 3 ; The mass ratio of strontium ferrite pre-sintered material to secondary additives is 1:0.142 for strontium ferrite calcined material: secondary additives;

[0035](2), the separated and dehydrated slurry obtained in step (1) is prepared into a green body by wet molding, and the main molding process conditions are: injection time 10s, magnetizing current 150A, holding time 10s, molding pressure 15Mpa;

[0036] (3), place the green body after step (2) molding in natural env...

Embodiment 2

[0041] A method for preparing a permanent magnet strontium ferrite material by a microwave sintering process, comprising the following steps:

[0042] (1) The strontium-containing ferrite calcined material is mixed with the secondary additives in the ball mill. After wet ball milling, the average particle size of the slurry reaches 1.0um and is dehydrated and separated. The moisture content of the dehydrated slurry is required. at 40%;

[0043] The auxiliary agent added for the second time is SiO 2 ; The mass ratio of strontium ferrite pre-sintered material to secondary additives is 1:0.142 for strontium ferrite calcined material: secondary additives;

[0044] (2), the separated and dehydrated slurry obtained in step (1) is prepared into a green body by wet molding, and the main molding process conditions are: injection time 20s, magnetizing current 120A, holding time 20s, molding pressure 20Mpa;

[0045] (3), place the green body after step (2) molding in natural environmen...

Embodiment 3

[0050] A method for preparing a permanent magnet strontium ferrite material by a microwave sintering process, comprising the following steps:

[0051] (1) The strontium-containing ferrite calcined material is mixed with the secondary additives in a ball mill. After wet ball milling, the average particle size of the slurry reaches 0.8um and is dehydrated and separated. The moisture content of the dehydrated slurry is required. at 30%;

[0052] The auxiliary agent added twice is H 3 BO 3 ; The mass ratio of strontium ferrite pre-sintered material to secondary additives is 1:0.142 for strontium ferrite calcined material: secondary additives;

[0053] (2), the separated and dehydrated slurry obtained in step (1) is prepared into a green body by wet molding, and the main molding process conditions are: injection time 15s, magnetizing current 100A, holding time 15s, molding pressure 18Mpa;

[0054] (3), place the green body after step (2) molding in natural environment for 36 hou...

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Abstract

The invention discloses a permanently magnetic strontium ferrite material and a sintering method thereof. The method comprises: mixing and milling a presintered material of strontium-containing ferrite and a secondarily added assistant in a ball mill; separating dehydrated slurry and preparing a blank by using wet-method forming; dehydrating and drying the formed blank at room temperature and the temperature of 400 DEG C first, and sintering the blank in a microwave sintering furnace by a certain process system; and thus obtaining the high-performance permanently magnetic strontium ferrite magnetic material. The main magnetic property parameters of the product include: the Br of 420 to 427mT, the Hcj OF 309 TO 362.8kA / m, and the BH(MAX) of 32.6 to 34.88kJ / m<3>. The method is characterized by obviously improving the structure and magnetic property of the permanently magnetic strontium ferrite through the controlled sintering, which is realized by setting reasonable sintering process conditions, of micro structures of magnetic materials, along with quick sintering, low energy loss and high production efficiency.

Description

technical field [0001] The present invention relates to a kind of permanent magnet strontium ferrite magnetic material and its wet-forming manufacturing method. Specifically, the wet-forming green body is first dehydrated at a certain temperature, and then microwave energy is used to quickly A method of sintering a permanent magnet strontium ferrite material that has been dehydrated. The high-performance permanent magnet strontium ferrite magnetic material obtained by the invention can be widely used in automobiles, electronic equipment, copier magnetic rollers, etc., and belongs to the field of magnetic materials. Background technique [0002] Looking back on the production of magnetic materials, it can be found that after the 1970s, the magnetic materials gradually changed to ferrite as the main body. In the 1990s, high-performance permanent ferrite magnetic materials were developed by adding rare earths to meet the miniaturization of electronic equipment. , The developme...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 金鸣林蒋涵涵王占勇
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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