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Permanent magnetic ferrite magnetic powder for dry pressing and preparation method thereof

A technology of permanent magnet ferrite and dry pressing, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, and magnetic materials. Relative orientation degree and density, effect of improving dispersion characteristics

Pending Publication Date: 2021-06-04
ANTE MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, at present, the relative orientation degree of dry-pressed sintered permanent magnet ferrite magnetic powder is only 90-92%.
Compared with wet pressing, dry pressing has the problems of low magnet density and low magnetic powder orientation

Method used

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  • Permanent magnetic ferrite magnetic powder for dry pressing and preparation method thereof
  • Permanent magnetic ferrite magnetic powder for dry pressing and preparation method thereof
  • Permanent magnetic ferrite magnetic powder for dry pressing and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] Such as Figure 4 As shown, the preparation method of the permanent ferrite magnetic powder for dry pressing of the present embodiment comprises the following steps:

[0045] (1) Preparation of coarse powder

[0046] Iron red and strontium carbonate were mixed according to the molar ratio (Fe 2 o 3 with SrCO 3 molar ratio) 5.90:1 for batching, adding 0.15wt% silicon dioxide based on the weight of iron red, mixing evenly, making pellets, pre-burning at 1295 ° C, and keeping warm for 60 minutes to obtain pre-fired pellets; after cooling , coarsely crushing the calcined balls to obtain a coarse powder with an average particle diameter of 3-6 microns.

[0047] (2) fine grinding

[0048] Based on the weight of the coarse powder, add 1.20wt% calcium carbonate, 0.25wt% silicon oxide, 0.15wt% boric acid and 0.10wt% iron red; then add a ball mill, add water and ball mill until the average particle size is 0.80 microns to obtain a slurry. The pH of the slurry was measured to ...

Embodiment 6

[0061] The preparation method of the permanent ferrite magnetic powder for dry pressing of the present embodiment comprises the following steps:

[0062] (1) Preparation of coarse powder

[0063] Using iron red, strontium carbonate, lanthanum oxide and cobalt oxide as raw materials, according to Sr 0.8 La 0.2 Fe 11.67 co 0.13 o 19 For batching, add 0.10wt% silicon dioxide based on the weight of iron red, mix evenly, pelletize, pre-fire at 1285°C, and keep warm for 60 minutes to obtain pre-fired balls; after cooling, pre-fired balls Coarse crushing to obtain a coarse powder with an average particle size of 3-6 microns.

[0064] (2) fine grinding

[0065] Based on the weight of the coarse powder, add 1.0wt% calcium carbonate, 0.25wt% silicon oxide, 0.10wt% boric acid and 0.10wt% iron red; then add a ball mill, add water and ball mill until the average particle size is 0.79 microns to obtain a slurry. The pH of the slurry was measured to be 10.6.

[0066] (3) pH adjustmen...

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Abstract

The invention belongs to the technical field of permanent magnetic ferrite, and particularly relates to a preparation method of permanent magnetic ferrite magnetic powder for dry pressing. The method comprises the following steps: (1) fine grinding: performing wet fine grinding on permanent magnetic ferrite pre-sintered material coarse powder and an additive until the average particle size is 0.6-1.2 microns to obtain slurry; (2) adjusting the pH value of the slurry: adjusting the pH value of the slurry to 7.0-9.0; (3) dehydrating and drying: dehydrating the slurry subjected to pH regulation, and then drying through a drying kiln to obtain dried magnetic powder; (4) grinding: grinding the magnetic powder by adopting a dry ball mill; and (5) dispersing: dispersing the ground magnetic powder by using a high-speed pulverizer to obtain the permanent magnetic ferrite magnetic powder. According to the invention, the dispersion characteristic of the magnetic powder is improved, the relative orientation degree and density of a corresponding sintered magnet are improved, and the residual magnetism Br of the magnet is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of permanent ferrite, and in particular relates to a permanent ferrite magnetic powder for dry pressing and a preparation method thereof. Background technique [0002] There are mainly two methods of forming permanent ferrite devices: dry pressing and wet pressing. [0003] The products produced by the wet pressing method have high performance and stability, but the finished product rate is low because the dehydration of the formed blank is not easy to control, and some products with complex shapes are even difficult to be pressed by the wet method at all. In addition, the wet pressing method also has the disadvantages of complicated molding process, slow pressing speed and low productivity. [0004] The dry pressing method is to fill the dry state of the permanent ferrite material powder into the molding cavity and form it in the magnetic field. Since dehydration is not required, the forming device has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/34H01F1/08
CPCH01F41/02H01F1/344H01F1/08
Inventor 连江滨王京列马晓伟楼旺永蔡永宁
Owner ANTE MAGNETIC MATERIAL CO LTD
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