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Preparation method of high-performance sintering permanent magnetic ferrite magnet

A permanent ferrite, high-performance technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of high cost and low efficiency, and achieve low cost, short milling time, and narrow particle size distribution Effect

Active Publication Date: 2013-02-27
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the deficiencies in cost and efficiency of current high-performance sintered permanent ferrite magnets, and solves the problems of high cost and low efficiency in large-scale industrial production through the following technical solutions

Method used

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  • Preparation method of high-performance sintering permanent magnetic ferrite magnet
  • Preparation method of high-performance sintering permanent magnetic ferrite magnet
  • Preparation method of high-performance sintering permanent magnetic ferrite magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The raw material requirements and corresponding weights for the batching process are as follows:

[0046] (1) Iron oxide (Fe 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size: 0.9-1.0μm), weight 26280Kg;

[0047] (2) Calcium carbonate (CaCO 3 ) powder, (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), weight 630Kg

[0048] (3) Strontium carbonate (SrCO 3 ) powder, (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), weight 2010Kg;

[0049] (4) Barium carbonate (BaCO 3 ) powder, (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), weight 120Kg;

[0050] (5) Lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.0-2.0μm), weight 960Kg;

[0051] Add the above-mentioned weighed raw materials into a 50 cubic meter mixing tank, add 90kg of sintering aid SiO2 powder (purity ≥ 99.0wt%, original average particle size of particles: 20-30.0μ...

Embodiment 2

[0058] Embodiment 2 (secondary addition cobalt amount different ratio test)

[0059] Select 1300kg of calcined powder same as Example 1, add secondary additives according to three different cobalt amounts, add 1300 liters of 90-100 ℃ hot water for ball milling, the ball mill is not cooled during ball milling, keep the slurry temperature at 100 Above ℃, ball milling for 12 hours, the average particle size of the slurry after ball milling is 0.92 μm.

[0060] After ball milling, cool down naturally, wait for the temperature of the slurry to reach below 50°C, adjust the water content of the forming slurry, adjust the concentration of the slurry to 65%, and then form it, and apply an orientation magnetic field with a magnetic field strength of 600 kA / m in the pressing direction , at a molding pressure of 0.4ton / cm 3 Perform compression molding. The obtained molded body was a cylinder with a diameter of 40 mm and a height of 13 mm.

[0061] The molded body is heat-treated at a t...

Embodiment 3

[0065] Embodiment 3 (comparative test of ball milling conditions)

[0066] Select calcined powder 1300kg identical with embodiment 1, add 1.0wt% lanthanum oxide (La 2 o 3 ) powder (purity ≥ 99.0wt%, original average particle size of particles: 1.0-2.0μm), 1.0wt% Co3O4 powder (purity ≥ 98.5wt%, original average particle size of particles: 1.0-2.0μm), 0.19wt% H 3 BO 3 Powder (purity ≥ 99.0wt%), 0.5wt% Cr2O3 powder (purity ≥ 99.0wt%, original average particle size of particles: 3.0-5.0μm), ball milled according to four different ball milling conditions.

[0067] The ball milling condition of embodiment 3-1 is: add 1300 liters of hot water at 90-100 ℃, the ball mill is not cooled during ball milling, and the ball milling time is 12 hours; the ball milling condition of embodiment 3-2 is: add 1300 liters of 10-35 ℃ water, and The ball mill needs to be cooled with cooling water, and the ball milling time is 12 hours; the ball milling condition of embodiment 3-3 is: add 1950 liters...

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Abstract

The invention discloses a preparation method of high-performance sintering permanent magnetic ferrite magnet. The magnet is prepared by the method that pre-sintered powder with main phase of Ca(x1)Sr(x2)Ba(x3)La(x)O nFe2O3 is added with second additive to obtain high-performance magnet with Br higher than 4200Gs, Hcj higher than 4500Oe and rectangularity Hk / Hcj higher than 0.94 through high-temperature soft ball milling process, wherein x1 is 0.05-0.40, x2 is 0.20-0.60, x3 is 0-0.15, x is 0.1-0.5, and n is 6.0-6.5. The preparation method disclosed by the invention has the advantages that the rare precious metal cobalt is not added into the preliminary pre-sintered powder, thus being favorable for large-scale production; the second additive is reasonable, the adjustability of addition of the rare precious metal cobalt is high, thus being more economical; and the high-temperature soft ball milling process is adopted in the ball milling process, so the ball milling time is short, the grain distribution is narrow, the average grain size is large, no dispersant is added, the dehydration property is good, and the molding efficiency is high.

Description

technical field [0001] The present invention relates to a high-performance sintered permanent ferrite magnet, which basically has an M-type magnetoplumbite structure, and is extremely useful for a wide range of magnetic application fields, such as automobiles, household appliances or electric tools, and more specifically belongs to high-performance permanent magnets. Ferrite magnet, which has higher residual magnetization and higher intrinsic coercive force than traditional permanent ferrite magnets, and has a higher squareness ratio Hk / Hcj. technical background [0002] M-type magnetoplumbite permanent ferrite magnet is a general term for compounds composed of divalent cation metal oxides (SrO and BaO) and ferric oxide (Fe2O3). Permanent ferrite magnets are widely used in automobiles and households. Electrical appliances, industrial automation and other industries. As a permanent ferrite material, strontium ferrite (SrFe 12 o 19 ) and barium ferrite (BaFe 12 o 19 )is w...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622C04B35/63H01F41/02
Inventor 翁革平熊言傲
Owner ANHUI SINOMAG TECH
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