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Dispersing agent and method for improving magnetic performance of bonded permanent magnetic ferrite material

A technology of bonding permanent magnets and dispersants, which is applied in the direction of inorganic material magnetism, magnetic materials, magnetic objects, etc., and can solve the problem of low magnetic performance, low impact strength, and difficulty in multi-pole magnetization of bonded permanent magnet ferrite. problem, to achieve the effect of increasing Zeta potential, preventing particle agglomeration, and improving magnetic properties

Pending Publication Date: 2021-10-29
BEIKUANG MAGNETS FUYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ferrite permanent magnet material is a permanent magnet material with the largest demand in industrial production at present. It is widely used in information and electromechanical industries. Permanent magnet materials can be divided into bonded and bonded ferrites according to their molding processes. Permanent magnet ferrite and sintered permanent magnet ferrite, in the fields of electromechanical and sensors, sintered ferrite occupies most of the current permanent magnet ferrite because of its high magnetic properties, good temperature stability, and low price. market, but it also has shortcomings such as low dimensional accuracy, low impact strength, and difficulty in multi-pole magnetization.
In contrast, bonded permanent magnet ferrite has gained more and more attention in the high-tech field in recent years because of its relatively simple molding process, easy to produce products with higher dimensional accuracy, and low relative density. More and more applications, such as medical, electronic appliances, instruments and other fields, but the magnetic properties of bonded permanent magnet ferrite are relatively low. With the production and application of high-tech equipment, the magnetic properties of bonded permanent magnet ferrite have been proposed higher requirement

Method used

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  • Dispersing agent and method for improving magnetic performance of bonded permanent magnetic ferrite material
  • Dispersing agent and method for improving magnetic performance of bonded permanent magnetic ferrite material
  • Dispersing agent and method for improving magnetic performance of bonded permanent magnetic ferrite material

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Effect test

Embodiment 1

[0029] refer to figure 1 A method for improving the dispersant of the magnetic properties of bonded permanent ferrite materials comprises the following steps:

[0030] S01: Add the dispersant to 1L of water, stir evenly, so that the dispersant can be fully dissolved in water, as a grinding medium, wherein the weight of calcium gluconate is 0.4% of the calcined ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;

[0031] S02: add 0.6 kg of material balls and grinding media into the ball mill tank in turn for grinding;

[0032] S03: Grinding the particle size of the ball mill slurry in step S2 to 1.15um;

[0033] S04: The ferrite ball grinding slurry obtained in step S3 is washed with water, tempered (920° C.), dried, and powdered to obtain bonded permanent ferrite magnetic powder.

[0034] The following table shows the process parameters and test results of permanent ferrite magnetic properties:

[0035]

[0036]

[0037] It can be seen from the a...

Embodiment 2

[0039] refer to figure 2 A method of improving the dispersant of the magnetic properties of bonded permanent ferrite materials also includes the following steps:

[0040] S11: Add the dispersant to 1L of water, stir evenly, so that the dispersant can be fully dissolved in water, as a grinding medium, wherein the weight of calcium gluconate is 0.4% of the calcined ball, and the ratio of sodium polyacrylate to calcium gluconate is 3: 1;

[0041] S12: Use ammonia water to adjust the pH value of the grinding medium to make the pH value reach 9.5;

[0042] S13: adding 0.6 kg of material balls and grinding media to the ball mill tank in turn for grinding;

[0043] S14: Grinding the particle size of the ball mill slurry in step S13 to 1.15um;

[0044] S15: The ferrite ball grinding slurry obtained in step S14 is washed with water, tempered, dried, and powdered to obtain bonded permanent ferrite magnetic powder.

[0045] The following table shows the process parameters and test r...

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Abstract

The invention discloses a dispersing agent and a method for improving the magnetic performance of a bonded permanent magnetic ferrite material, the combined action of sodium polyacrylate and calcium gluconate is beneficial to promoting dispersion of ferrite particles and preventing particle aggregation, the aqueous solution of sodium polyacrylate is alkaline, and the hydrolysis of the dispersing agent is prevented by adjusting the pH value of the solution, the Zeta potential between the powder is improved, and due to the improvement of the Zeta potential, stronger electrostatic repulsive force can be obtained between particles, the dispersity of the magnetic powder particles is improved, the orientation degree of the permanent magnetic ferrite and the stability of slurry are improved, so that the purpose of improving the magnetic performance of the bonded permanent magnetic ferrite is achieved; the magnetic performance of the bonded permanent magnetic ferrite prepared by the method is obviously improved, and compared with the addition or single addition of a dispersant under the condition of an alkaline or weakly alkaline grinding medium, the addition of the combined dispersant into the alkaline grinding medium can obviously improve the magnetic performance of the permanent magnetic ferrite.

Description

technical field [0001] The invention relates to the technical field of industrial production, in particular to a dispersant and a method for improving the magnetic properties of bonded permanent ferrite materials. Background technique [0002] Ferrite permanent magnet material is a permanent magnet material with the largest demand in industrial production at present. It is widely used in information and electromechanical industries. Permanent magnet materials can be divided into bonded and bonded ferrites according to their molding processes. Permanent magnet ferrite and sintered permanent magnet ferrite, in the fields of electromechanical and sensors, sintered ferrite occupies most of the current permanent magnet ferrite because of its high magnetic properties, good temperature stability, and low price. market, but it also has disadvantages such as low dimensional accuracy, low impact strength, and difficulty in multi-pole magnetization. In contrast, bonded permanent magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B02C17/00H01F1/03
CPCC01G49/0018B02C17/00H01F1/0315C01P2006/42
Inventor 王剑锋王继全张鹏杰刘辉孙威刘荣明王永齐李炳山魏汉中谢光环牛辉辉周超胡国辉
Owner BEIKUANG MAGNETS FUYANG CO LTD
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