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Rubber-plastic ferrite magnetic powder, preparation method thereof, magnetic product and application

A ferrite magnet, rubber and plastic technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of unfavorable magnetic powder Br, unfavorable, unable to obtain good orientation, etc.

Active Publication Date: 2019-04-05
ANTE MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem caused by adding a high proportion of strontium chloride is that the magnetic powder contains a large proportion of particles with a large diameter-to-thickness ratio (diameter-to-thickness ratio greater than 5); this has caused a contradictory problem, adding a low proportion of strontium chloride, The magnetic powder contains a relatively high proportion of particles with a small diameter-to-thickness ratio (diameter-to-thickness ratio less than 2), and the particles with a small diameter-to-thickness ratio cannot obtain good orientation during the rolling process, so it is not conducive to improving the Br of rubber-plastic ferrite magnetic powder; while increasing strontium chloride Adding proportion, although the proportion of small diameter-thickness ratio particles decreases, but the proportion of large diameter-thickness ratio particles does increase significantly, and the proportion of large diameter-thickness ratio particles increases, which is easy to cause bridging phenomenon and deteriorate the orientation of magnetic powder, which is not conducive to the increase of magnetic powder Br

Method used

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  • Rubber-plastic ferrite magnetic powder, preparation method thereof, magnetic product and application
  • Rubber-plastic ferrite magnetic powder, preparation method thereof, magnetic product and application
  • Rubber-plastic ferrite magnetic powder, preparation method thereof, magnetic product and application

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preparation example Construction

[0029] The present invention also provides a method for preparing the rubber-plastic ferrite magnetic powder described in the above technical solution, comprising the following steps:

[0030] Calcining after mixing iron red, strontium carbonate, manganese carbonate and strontium chloride to obtain calcined pellets, the strontium carbonate raw material is strontium carbonate;

[0031] Sequentially crushing, finely grinding, water washing, dehydrating and drying the calcined balls to obtain rubber and plastic coarse ferrite magnetic powder;

[0032] Tempering the rubber-plastic coarse ferrite magnetic powder to obtain the rubber-plastic ferrite magnetic powder.

[0033] In the present invention, iron red, strontium carbonate, manganese carbonate and strontium chloride are mixed and calcined to obtain calcined balls, and the strontium carbonate raw material is preferably strontium carbonate.

[0034] In the present invention, described iron red and Fe in strontium carbonate 2 ...

Embodiment 1

[0044] Stir and mix 1300g iron red, 210g strontium carbonate, 75g strontium chloride, and 6.0g manganese carbonate, and pre-calcine at 1080°C for 2 hours to obtain calcined pellets;

[0045] The calcined pellets are crushed to obtain crushed coarse powder with a particle size of 5 μm;

[0046] The crushed coarse powder is wet-milled to obtain a fine powder;

[0047] washing the fine powder with water for 3 times, then dehydrating, and drying, the standard of drying is that the moisture content in the rubber-plastic coarse ferrite magnetic powder is less than 0.50%, to obtain the rubber-plastic coarse ferrite magnetic powder;

[0048] Finally, the rubber and plastic coarse ferrite magnetic powder was tempered, the tempering temperature was 920°C, and the holding time was 35 minutes to obtain the rubber and plastic ferrite magnetic powder; the rubber and plastic ferrite magnetic powder was calendered by calendering to obtain magnetic products.

[0049] Testing of magnetic produ...

Embodiment 2

[0052] Stir and mix 1300g iron red, 210g strontium carbonate, 60g strontium chloride, and 3.9g manganese carbonate, and pre-calcine at 1080°C for 1 hour to obtain calcined pellets;

[0053] Coarsely crushing the calcined pellets to obtain a crushed coarse powder with a particle size of 2 μm;

[0054] The crushed coarse powder is wet-milled to obtain a fine powder;

[0055] washing the fine powder with water for 3 times, then dehydrating, and drying, the standard of drying is that the moisture content in the rubber-plastic coarse ferrite magnetic powder is less than 0.50%, to obtain the rubber-plastic coarse ferrite magnetic powder;

[0056] Finally, the rubber and plastic coarse ferrite magnetic powder is tempered, the tempering temperature is 920°C, and the holding time is 10 minutes to obtain the rubber and plastic ferrite magnetic powder;

[0057] The rubber-plastic ferrite magnetic powder is calendered by a calendering method to obtain a magnetic product.

[0058] Testin...

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Abstract

The invention provides rubber-plastic ferrite magnetic powder. The rubber-plastic ferrite magnetic powder is SrFe12O19 with a magnetoplumbite structure, and comprises an Mn element having the mass fraction of 0.35-0.75%. Particles of the ferrite magnetic powder are flaky, the diameter-to-thickness ratio of the particles ranges from 2.0 to 5.0, and the distribution of the particle shapes is uniform; the ferrite magnetic powder has high jHc and Br. The rubber-plastic ferrite magnetic powder is made from iron red and barium carbonate which are in a molar ratio of (5.5-5.9):1, manganese carbonateand SrCl2 with the mass fraction of 4.5-6.5% are added, pre-burning is carried out at the temperature of 1050-1150 DEG C after uniform mixing, and the rubber-plastic ferrite magnetic powder is obtained after the processes of coarse crushing, fine grinding, tempering, etc.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a rubber-plastic ferrite magnetic powder and its preparation method, magnetic product and application. Background technique [0002] With the development of miniaturization of electronic components, the performance requirements of rubber and plastic ferrite magnetic powder are getting higher and higher. High Br and high jHc are the key requirements for high-performance magnetic powder. Therefore, how to effectively improve the Br and jHc of rubber-plastic ferrite magnetic powder is an important issue. [0003] Previous studies have found that adding a certain proportion of strontium chloride to the mixing formula, the strontium chloride is in a molten state during pre-calcination, which can control the growth rate of ferrite grains in different directions, thereby effectively controlling the ferrite grain diameter-thickness ratio. In general, the larger the addition ratio of s...

Claims

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Application Information

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IPC IPC(8): C01G49/00C08K3/22
CPCC01G49/0072C01P2004/20C01P2004/61C01P2004/62C01P2006/42C08K3/22
Inventor 连江滨王兴
Owner ANTE MAGNETIC MATERIAL CO LTD
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