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Manufacturing method of dry-pressed anisotropic ferrite magnetic powder

A ferrite magnetism and manufacturing method technology, applied in the direction of inorganic material magnetism, can solve the problems of difficult mixing of adhesives and lubricants, affecting the appearance and magnetic performance, affecting the uniformity of magnetic powder, etc., and achieving good performance consistency , Conducive to mass production, improve the effect of magnetic properties

Inactive Publication Date: 2015-04-08
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Add the binder and lubricant directly to the magnet powder; when using this process, it is difficult to mix the binder and lubricant evenly, especially for organic substances such as camphor, which are easy to agglomerate and difficult to break The agglomeration and dispersion are uniform, resulting in many dark spots in the finished dry-pressed magnet, which affects the appearance and magnetic properties
[0005] 2. After dissolving the binder and lubricant with an organic solvent, add the solution to the magnet powder; when the magnet powder is prepared in this way, the wall sticking phenomenon of the magnet powder is serious during mass production, which in turn affects the The uniformity of magnetic powder distribution in the magnet

Method used

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  • Manufacturing method of dry-pressed anisotropic ferrite magnetic powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The permanent magnet ferrite calcined material includes hexagonal ferrite containing A, R, B and Fe, and has the molecular formula of the following characteristics: A 1～x R x [(Fe 3+ a Fe 2+ b ) 12-y B y ] z o 19 , where A represents one or two elements of Sr and Ba; R represents at least one element selected from rare earth elements and Bi, and must contain La; B represents Co, Ti, Mn, Zn, Ge, As and At least one element in W must contain Co, and the valence of the Co element is positive trivalent; wherein a+b is equal to 1; z is preferably 0.9 to 1.1; a is preferably 0.97 to 0.999, and b is preferably 0.001 to 0.03; The preferred ranges of x and y mentioned above are: 0≤x≤0.54, 0≤y≤0.45, and the optimal values ​​of x, y, z are preferably: 1.0≤x / y≤1.5, and z is 1.

[0026] The specific process of dry pressing anisotropic ferrite magnetic powder is as follows:

[0027] 1. Ball milling process

[0028] Firstly, the pre-fired permanent magnet ferrite is subject...

Embodiment 2

[0038] Except milling process, all the other processes are identical with embodiment 1. Among them, the milling process is as follows:

[0039] 3. Milling process

[0040] The material piece after drying, passes through 20 mesh sieves earlier, makes magnetic powder; Then camphor and alcohol are mixed with the ratio of (1.5 grams: 1 milliliter), make solution; Then this solution and magnetic powder are mixed with (1 Milliliter: 5 grams), mix the solution and the magnetic powder evenly by spraying, and put it into a drying box and dry it at a temperature of 80 degrees Celsius for 1 hour to obtain the mother powder; finally, the mother powder and the magnetic powder are re- Mix in a ratio of 1:10, add 0.5wt% calcium stearate (through a 100-mesh sieve), mix in a dry mixer for 1 hour, and then pass through a 40-mesh sieve through a high-speed pulverizer to obtain dry-pressed heterosexual iron Oxygen powder.

Embodiment 3

[0042] Except milling process, all the other processes are identical with embodiment 1. Among them, the milling process is as follows:

[0043] 3. Milling process

[0044] The material piece after drying, passes through 20 mesh sieves earlier, makes magnetic powder; Then camphor and alcohol are mixed with the ratio of (1 gram: 1.5 milliliters), make solution; Then this solution and magnetic powder are mixed with (1 Milliliter: 6 grams), the solution and the magnetic powder were evenly mixed by spraying, and put into a drying oven to dry for 1 hour at a temperature of 80 degrees Celsius to obtain the mother powder; finally, the mother powder and the magnetic powder were re- Mix in a ratio of 1:7, add 0.5wt% calcium stearate (through a 100-mesh sieve), mix in a dry mixer for 1 hour, and then pass through a 40-mesh sieve through a high-speed pulverizer to obtain dry-pressed heterosexual iron Oxygen powder.

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Abstract

The invention discloses a manufacturing method of dry-pressed anisotropic ferrite magnetic powder which is uniformly dispersed and has effectively improved BH max. The manufacturing method comprises the following steps of dissolving a binder by an organic solvent, spraying the solution into a small amount of magnetic powder, carrying out drying to obtain mother powder, mixing the mother powder and the magnetic powder, adding an organic dispersant into the mixed powder, carrying out stirring, crushing the mixture by a high-speed pulverizer, sieving the powder, and processing the powder to form the dry-pressed anisotropic ferrite magnetic powder. The manufacturing method can effectively improve distribution uniformity of the magnetic powder in the magnet, improve permanent magnetism material BH max, and especially improve residual flux density (Br) and BH max. The dry-pressed anisotropic ferrite magnetic powder obtained by the manufacturing method has good performance consistency and no black points, does not adhere to the wall easily and is conducive to batch production.

Description

technical field [0001] The invention relates to the technical field related to magnetic materials, in particular to a method for manufacturing dry-pressed anisotropic ferrite magnetic powder. Background technique [0002] As we all know, measuring the magnetic properties of permanent magnet materials mainly includes three parameters, namely residual magnetic flux density (Br), coercive force (magnetic induction coercive force Hcb and intrinsic coercive force Hcj) and maximum energy product (BH)max. There are two traditional manufacturing methods of permanent ferrite: dry pressing and wet pressing. Among them, wet pressing has the characteristics of good orientation and high magnetic properties such as remanence, and is currently widely used. However, dry press molding also has its own characteristics and application fields. It has the characteristics of high molding efficiency, wide application range, and diversified product shapes, and can be applied to many miniaturized a...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/626H01F1/11
Inventor 叶华姚淦韦晓阳胡良权丁伯明樊良军
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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