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Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet

A technology of ferrite magnets and bonded magnets, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of high filling rate, difficult to obtain, and difficult to obtain high Br and high jHc at the same time, To achieve the effect of reducing the pre-burning temperature

Active Publication Date: 2010-11-24
BEIKUANG MAGNETS FUYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the bonded magnets and magnetic rollers described in this patent application are injection molded, this molding method requires that the magnetic powder must have a larger average particle size (>1.5μm) and a higher compression density (>3.25g / cm 3 ), otherwise it is difficult to obtain high filling rate and high Br
The inventors found that it is difficult to simultaneously obtain high Br and high jHc (such as Br≥285mT, jHc≥210kA / m) of ferrite powder prepared by the preparation method disclosed in this patent application.

Method used

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  • Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet
  • Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet
  • Bonded ferrite magnetic powder, preparation method thereof and bonded permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a preparation method of bonded ferrite magnetic powder, which specifically includes:

[0046] Weighing 1420g purity is 98.5% iron red, 205g purity is 98% strontium carbonate, 24.4g purity is 98.5% lanthanum oxide, 12 grams purity is 99.2% zinc oxide, 2 grams purity is 99.5% bismuth oxide, Adopt wet type ball mill to mix 3 hours, then dry, obtain compound;

[0047] Weigh 1500 grams of the above mixture, and add 15 grams of strontium chloride SrCl 2 , sintering at 1200°C for 1 hour to obtain pre-sintered material; coarsely crushing the pre-sintered balls with a dry ball mill, followed by fine grinding with a wet ball mill for 3 hours, and drying to obtain a finely ground powder;

[0048] The finely ground powder was annealed at 940°C for 1 hour, and then dispersed to obtain bonded magnetic powder.

[0049] Bonded magnets can be prepared by using the above-mentioned bonded magnetic powder using a molding process, as follows:

[0050] Weigh 1000g...

Embodiment 2

[0055] This embodiment provides a preparation method of bonded ferrite magnetic powder, which specifically includes:

[0056] Weigh 1405g of iron red with a purity of 98.5%, 183g of strontium carbonate with a purity of 98%, 49g of lanthanum oxide with a purity of 98.5%, 23.9 grams of zinc oxide with a purity of 99.2%, and 3.5 grams of bismuth oxide with a purity of 99.5%. The ball mill was mixed for 3 hours, then dried to obtain the mixture;

[0057] Weigh 1500 grams of the mixture prepared above, add 15 grams of strontium chloride, and sinter at 1200° C. for 1 hour to obtain pre-sintered material. Using a dry ball mill to roughly crush the calcined balls, then using a wet ball mill to finely grind them for 3 hours, and drying to obtain finely ground powder;

[0058] The finely ground powder was annealed at 940°C for 1 hour, and then dispersed to obtain bonded magnetic powder.

[0059] Bonded magnets can be prepared by using the above-mentioned bonded magnetic powder using a...

Embodiment 3

[0065] This embodiment provides a preparation method of bonded ferrite magnetic powder, which specifically includes:

[0066] Weighing 1395g purity is 98.5% iron red, 161g purity is 98% strontium carbonate, 73.3g purity is 98.5% lanthanum oxide, 35.9 grams purity is 99.2% zinc oxide, 5 grams purity is 99.5% bismuth oxide, The mixture was mixed in a wet ball mill for 3 hours, and then dried to obtain a mixture.

[0067] Weigh 1500 g of the mixed material, add 15 g of strontium chloride, and sinter at 1200° C. for 1 hour to obtain pre-sintered material. The calcined balls were coarsely broken by a dry ball mill, then finely ground by a wet ball mill for 3 hours, and dried to obtain a finely ground powder.

[0068] The finely ground powder was annealed at 940°C for 1 hour, and then dispersed to obtain bonded magnetic powder.

[0069] Weigh 1000g of bonded magnetic powder, 110g of nylon 6 and 20g of related additives (silane coupling agent and lubricant TAF), after mixing evenly...

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Abstract

The invention discloses bonded ferrite magnetic powder, a preparation method thereof and a bonded permanent magnet, which belong to the technical field of magnetic materials. The magnetic powder comprises a principal phase with the molecular formula of (M1-xLax)O.n(Fe1-yZnyBiz)2O3, wherein M denotes at least one of strontium and barium; x, y, z and n denote mole ratios, and meets x=2mn(y+z); x is 0.01 to 0.40; z / y is more than or equal to 0.01 and less than or equal to 0.3; n is 5.50 to 6.40; and m is 0.90 to 1.10. The invention also provides the preparation method for the bonded ferrite magnetic powder, and the bonded permanent magnet. Bismuth oxide is added in certain proportion in a material mixing process, and chloride is added in certain proportion as a fluxing agent in the material mixing process, so the reduction of pre-burning temperature and control over the growth of crystal grains and the grain size distribution of the magnetic powder are realized, and the prepared magnetic powder is endowed with the advantages of high Br and high jHc.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a bonded ferrite magnetic powder, a preparation method thereof and a bonded magnet. Background technique [0002] Permanent ferrite materials include barium ferrite and strontium ferrite. Because of their advantages of wide source of raw materials, low price and high cost performance, they are widely used in industrial and living fields such as motors, automobiles and home appliances. So far, the permanent magnet ferrite material is still the permanent magnet material with the highest output. [0003] According to different molding methods, permanent ferrite magnets are mainly divided into sintered ferrite and bonded ferrite. Sintered ferrite requires secondary sintering and grinding processes; bonded ferrite is made by compounding magnetic powder and binder. Compared with sintered ferrite, bonded ferrite has the advantages of high dimensional accuracy and good plast...

Claims

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Application Information

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IPC IPC(8): H01F1/113C04B35/26C04B35/64H01F41/02
Inventor 连江滨廖有良吕宝顺要继忠邹科
Owner BEIKUANG MAGNETS FUYANG CO LTD
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