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A bonded ferrite magnetic powder, bonded magnet and preparation method thereof

A technology of ferrite magnets and bonded magnets, applied in chemical instruments and methods, magnetic materials, magnetic objects, etc., can solve the problems of high viscosity of magnetic powder and difficult to break through 91wt.% of magnetic powder filling

Active Publication Date: 2018-05-11
ANTE MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the magnetic powder obtained by this scheme contains a large proportion of fine powder, the viscosity of the magnetic powder is relatively high, and the filling amount of the magnetic powder is difficult to exceed 91wt.%. The obtained injected magnet Br cannot exceed 305mT

Method used

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  • A bonded ferrite magnetic powder, bonded magnet and preparation method thereof
  • A bonded ferrite magnetic powder, bonded magnet and preparation method thereof
  • A bonded ferrite magnetic powder, bonded magnet and preparation method thereof

Examples

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preparation example Construction

[0031] The embodiment of the present invention provides a kind of preparation method of above-mentioned bonded ferrite magnetic powder, such as figure 1 shown, including the following steps:

[0032] Step 101, using industrial grade iron red, strontium carbonate and barium carbonate as raw materials, according to molecular formula (Sr 1～x Ba x )O·nFe 2 o 3 For ingredients,

[0033]Wherein, n represents the molar ratio, satisfying n=6.11~6.30; 0.10≤x≤0.20.

[0034] Step 102, mixing materials: using a mixing device to mix the raw materials evenly, and adding 0.5-4.0% strontium chloride by weight of the iron red raw materials during the mixing process.

[0035] Step 103, pre-burning: pre-burning at 1200-1280°C to obtain pre-fired material;

[0036] Step 104, Grinding: Use a ball mill to coarsely crush the calcined material, and then use a sand mill to further grind, the average particle size is controlled at 1.2-1.8 microns, and after drying, a fine powder is obtained.

[...

Embodiment 1

[0041] The process of preparing bonded ferrite magnetic powder in this embodiment is as follows:

[0042] Weigh 1290g of iron red with a purity of 99.2%, 172g of strontium carbonate with a purity of 98%, 26g of barium carbonate with a purity of 99%, and 30 grams of strontium chloride, mix them uniformly with a strong mixer, and then pelletize to obtain green pellets;

[0043] The raw balls were sintered at 1220°C for 1 hour to obtain pre-sintered materials; the pre-sintered balls were roughly broken by a dry ball mill, then finely ground by a sand mill for 3 hours, and finely ground powder was obtained after drying;

[0044] The finely ground powder was annealed at 930° C. for 1 hour and dispersed to obtain bonded magnetic powder.

[0045] Compaction inspection: Weigh 20 grams of magnetic powder and 1.4 grams of paraffin wax and mix them evenly; then weigh 20 grams of the mixture and press it into a Φ25mm compact under a pressure of 7 MPa; use a BH instrument to test the magne...

Embodiment 2

[0052] The process of preparing bonded ferrite magnetic powder in this embodiment is as follows:

[0053] Weigh 1290g of iron red with a purity of 99.2%, 163g of strontium carbonate with a purity of 98%, 38.5g of barium carbonate with a purity of 99%, and 30 grams of strontium chloride, mix them uniformly with a strong mixer, and then pelletize to obtain green pellets ;

[0054] The raw balls were sintered at 1220°C for 1 hour to obtain pre-sintered materials; the pre-sintered balls were roughly broken by a dry ball mill, then finely ground by a sand mill for 3 hours, and finely ground powder was obtained after drying;

[0055] The finely ground powder was annealed at 930° C. for 1 hour and dispersed to obtain bonded magnetic powder.

[0056] The green compact was tested with the same method as in Example 1, and the jHc detection value of the green compact in this embodiment was 244kA / m.

[0057] Carry out compression density (CD value) detection with the method for embodime...

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Abstract

The invention provides a bonded permanent magnetic ferrite powder, a bonding magnet and a preparation method thereof. The bonded ferrite magnetic powder has a main phase shown as the following molecular formula: (Sr1-xBax)O.nFe2O3, wherein, n represents molar ratio and meets n=6.11- 6.30, and x is greater than or equal to 0.10 and smaller than or equal to 0.20. The preparation method of the bonded permanent magnetic ferrite powder includes taking industrial grade iron oxide red, strontium carbonate and barium carbonate as the raw materials, conducting burdening accordance to the molecular formula of (Sr1-xBax)O.nFe2O3, mixing the raw materials uniformly, and adding strontium chloride in the mixing process; performing pre-sintering at 1200-1280DEG C to obtain a pre-sintered material; carrying out coarse crushing and grinding on the pre-sintered material, and performing drying to obtain fine powder; annealing the fine powder; mixing the obtained magnetic powder with nylon 6 and related additives evenly, and conducting granulation and injection molding so as to obtain the bonded magnet with BR greater than 310mT.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a bonded permanent ferrite magnetic powder, a bonded magnet and a preparation method thereof. Background technique [0002] Due to the advantages of wide source of raw materials, cheap price and high cost performance, permanent magnet ferrite materials are widely used in motors, automobiles, home appliances and other industrial and living fields. So far, permanent magnet ferrite materials are still the permanent magnet materials with the highest output. Bonded ferrite is made by compounding ferrite magnetic powder and binder. [0003] The magnetic performance indicators of bonded ferrite products mainly include residual magnetic induction intensity Br, intrinsic coercive force jHc, and maximum magnetic energy product (BH) max Wait. With the development of miniaturization of electronic components, the volume of magnets is getting smaller and smaller, so the performance of magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/11
CPCC01G49/0018C01P2006/42H01F1/113
Inventor 连江滨王兴
Owner ANTE MAGNETIC MATERIAL CO LTD
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