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Method for preparing anisotropic bonded rare-earth permanent magnet

A rare earth permanent magnet, anisotropic technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of material performance decline, low strength, difficult orientation, etc., to improve magnetic properties, good orientation, and market competition. strong effect

Inactive Publication Date: 2011-11-16
湖南航天有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the existing anisotropic bonded rare earth permanent magnets, there is no orientation magnetic field when mixing materials, which leads to difficulties in orientation during molding, reduced material performance, and low strength. The present invention aims to provide an anisotropic bonded rare earth permanent magnet. The preparation method of the rare earth permanent magnet. In this method, an orientation magnetic field is added during the mixing process, and the mixing speed is adjustable. This mixing method can significantly improve the orientation degree of the magnetic powder, thereby improving the magnetic properties of the material

Method used

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  • Method for preparing anisotropic bonded rare-earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take out the anisotropic NdFeB magnetic powder 96.9% (mass percentage) of crossing 100 mesh sieves (the particle size of anisotropic rare earth permanent magnet magnetic powder is all crossing 100 mesh sieves in the following examples), KH-550 silane coupling agent is 1% (mass percentage), binder is 1.9% (mass percentage); 0.2% (mass percentage) of zinc stearate is for use. First, add the anisotropic NdFeB magnetic powder in the above ratio into the acetone solution dissolved in the KH-550 silane coupling agent in the above ratio, stir, and when the liquid content of the acetone solution is lower than 8%, add it into the dissolved In the acetone solution of the binder of the above ratio, stir, and when the liquid content of the acetone solution is lower than 8%, place the magnetic powder in a 0.5T magnetic field for stirring and drying, and when the liquid content of the magnetic powder reaches 5%, add Zinc stearate 0.2% of the above ratio, continue to stir until the ma...

Embodiment 2

[0042]Take out 98% (mass percentage) of the anisotropic NdFeB magnetic powder, 1.9% (mass percentage) of the binder, and 0.1% (mass percentage) of zinc stearate for use. First add the anisotropic NdFeB magnetic powder in the above ratio into the acetone solution in which the binder in the above ratio is dissolved, and stir. After the liquid content of the acetone solution is lower than 10%, place the magnetic powder in a 1T magnetic field for stirring Drying, when the liquid content of the magnetic powder is about to reach the predetermined target, add the zinc stearate in the above ratio, continue stirring until the magnetic powder reaches the expected liquid content of 5%, take out the magnetic powder, and sieve. Put the mixed magnetic powder into the cavity of the mold, and carry out orientation pressing in a magnetic field forming press with an orientation magnetic field of 1.7T and a forming pressure of 900 MPa, then demagnetize and demould to complete the forming of the m...

Embodiment 3

[0044] Take out anisotropic NdFeB magnetic powder 96.9% (mass percentage), KH-550 silane coupling agent is 1% (mass percentage), and binding agent is 1.9% (mass percentage); Zinc stearate 0.2% (mass percentage) )stand-by. Add the anisotropic NdFeB magnetic powder in the above ratio into the absolute ethanol solution dissolved in the KH-550 silane coupling agent in the above ratio, stir, and after the absolute ethanol is dried, add it into the viscose solution in the above ratio Stir in the acetone solution of the binder. After the liquid content of the acetone solution is lower than 15%, place the magnetic powder in a 0.005T magnetic field for stirring and drying. When the liquid content of the magnetic powder is about to reach the predetermined target, add the above-mentioned proportion of Zinc stearate, continue to stir until the magnetic powder reaches the expected 6% liquid content, take out the magnetic powder, and sieve. Put the mixed magnetic powder into the cavity of ...

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Abstract

The invention discloses a method for preparing an anisotropic bonded rare-earth permanent magnet and aims to solve the problem that an oriented magnetic field does not exist during material mixing so orientation is difficult to realize during forming, and the performance of the material is poor in the conventional anisotropic bonded rare-earth permanent magnet. The method comprises the following steps of: mixing anisotropic rare-earth permanent magnet powder, an adhesion agent, additive and the like, and pelleting at a magnetic field of 0.005 to 3T, and performing orientation compression moulding, and curing at the magnetic field of 0.8 to 5T to obtain the anisotropic bonded rare-earth permanent magnet. After pelleting in the magnetic field, the prepared anisotropic bonded rare-earth permanent magnet is high in orientation degree and the magnetic property is improved obviously.

Description

technical field [0001] The invention relates to a preparation method of anisotropic bonded rare earth permanent magnet, in particular to a preparation method of orientation granulation in a magnetic field and orientation molding in a magnetic field at normal temperature. Background technique [0002] As a new type of composite functional material, bonded rare earth permanent magnet is widely used in information technology, automobile industry, computer and other fields. Compared with sintered magnets, bonded rare earth permanent magnets have the advantages of low process cost, high dimensional accuracy, easy molding of complex shape devices, and easy realization of large-scale automated production. And performance research has attracted people's attention. At present, the preparation methods of bonded rare earth permanent magnetic materials mainly include the following types: compression molding, injection molding, extrusion molding and rolling molding. Among them, the com...

Claims

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Application Information

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IPC IPC(8): B22F3/03B22F3/24H01F1/053
Inventor 谭春林胡娟刘仕超胡盛青罗明舒阳会万绍平戴传波
Owner 湖南航天有限责任公司
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