Anisotropic permanent magnetic ferrite and preparation method thereof

A technology of permanent magnet ferrite and ferrite magnet, which is applied in the field of heterosexual permanent magnet ferrite and its preparation, can solve problems such as poor lubricity, difficulty in obtaining both solutions, and decreased bonding effect of products, and achieve good molding effects , the effect of good magnetic comprehensive performance

Active Publication Date: 2021-03-19
江门江益磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical benefit of this patented technology lies within its ability to create strong magnets with excellent properties by forming it into an oriented structure that allows for easy handling during manufacturing processes without losing their shape or function after being dried out at room temperature.

Problems solved by technology

This patented technical issue addressed in this patents relates to improving the quality and efficiency of producing high-quality rare earth iron oxide materials through traditional processes such as casting or compression moldings. While these techniques improve the overall characteristics of the final product, they often lead to increased costs due to waste generated during manufacturing. To address this challenge, there was developed a novel type called CAPOLLA® where special chemical agents were added instead of sintering oil to create a stronger bond between particles rather than just being held together like sandwich plaster. These chemistries help reduce particle size while maintaining sufficient fluidity and preventing sedimentation from settling out over time.

Method used

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  • Anisotropic permanent magnetic ferrite and preparation method thereof
  • Anisotropic permanent magnetic ferrite and preparation method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a kind of heterosexual permanent magnet ferrite, and its preparation method comprises the following steps:

[0027] (1) 0.6 parts by weight of polyvinyl alcohol are added to 135 parts by weight of water to obtain a dilute polyvinyl alcohol solution, that is, the proportion of polyvinyl alcohol in the dilute polyvinyl alcohol solution is 0.44wt%;

[0028] (2) Add 300 parts by weight of ferrite magnetic powder (with a particle size of 0.65-0.85 μm) into the dilute polyvinyl alcohol solution in step (1), stir and mix with a mixer to obtain a slurry;

[0029] (3) Dry the slurry in step (2) at a low temperature of 75° C., pulverize it with a disperser after drying, add 0.9 parts by weight of lubricant calcium stearate, stir and disperse, and disperse for a total of 3 times to obtain Anisotropic permanent magnet ferrite powder;

[0030] (4) Place the anisotropic permanent magnet ferrite powder in step (3) in a magnetic field of 6000Oe, perform dry press

Embodiment 2

[0032] This embodiment provides a kind of heterosexual permanent magnet ferrite, and its preparation method comprises the following steps:

[0033] (1) Add 0.6 parts by weight of polyvinyl alcohol to 255 parts by weight of water to obtain a dilute polyvinyl alcohol solution, that is, the proportion of polyvinyl alcohol in the dilute polyvinyl alcohol solution is 0.23wt%;

[0034] (2) Add 300 parts by weight of ferrite magnetic powder (with a particle size of 0.65-0.85 μm) into the dilute polyvinyl alcohol solution in step (1), stir and mix with a mixer to obtain a slurry;

[0035] (3) Dry the slurry in step (2) at a low temperature of 80° C., pulverize it with a disperser after drying, then add 0.9 parts by weight of lubricant calcium stearate, stir and disperse, and disperse for a total of 3 times to obtain Anisotropic permanent magnet ferrite powder;

[0036] (4) Place the anisotropic permanent magnet ferrite powder in step (3) in a magnetic field of 7000Oe, carry out dry pres

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Abstract

The invention belongs to the technical field of permanent magnetic ferrite, and discloses an anisotropic permanent magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: (1) adding polyvinyl alcohol water to obtain a polyvinyl alcohol dilute solution, wherein the ratio of polyvinyl alcohol in the polyvinyl alcohol dilute solution is 0.1-2 wt%; (2)adding ferrite magnetic powder into the polyvinyl alcohol dilute solution, stirring and mixing to obtain slurry, wherein the mass ratio of the ferrite magnetic powder to the polyvinyl alcohol dilute solution in the slurry is 3: (1.2-3); (3) drying the slurry at a low temperature of 70-80 DEG C, crushing after drying, adding a lubricant, stirring and dispersing to obtain anisotropic permanent magnetic ferrite powder; and (4) placing the anisotropic permanent magnetic ferrite powder in a magnetic field, and carrying out dry pressing molding, sintering and grinding to obtain the anisotropic permanent magnetic ferrite. The anisotropic permanent magnetic ferrite product prepared by the preparation method is excellent in molding effect and magnetic comprehensive performance.

Description

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Claims

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Application Information

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Owner 江门江益磁材有限公司
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