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Surface coating method for improving coercive force of rare earth permanent magnet

A technology of surface coating and rare earth permanent magnets, which is applied in the field of surface coating of rare earth permanent magnets to improve the coercive force, can solve the problems of increased cost of magnets, and achieve high coercive force, high coercivity, and simple operation Effect

Inactive Publication Date: 2020-02-11
江苏甬磁磁性材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnets that can maintain their magnetism for a long time are called permanent magnets, such as natural magnetite (magnetite) and artificial magnets (alnico) The demand for hybrid electric vehicles, pure electric vehicles and energy-saving air-conditioning compressors is increasing, and the demand for rare earth permanent magnet materials with high coercive force (such as R-Fe-B series rare earth permanent magnets) is also increasing , the traditional method of improving the coercive force requires the use of a large amount of rare earth elements, resulting in a substantial increase in the cost of the magnet, and will sacrifice part of the remanence and energy product. Therefore, we propose a surface coating method for rare earth permanent magnets to increase the coercive force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of rare earth permanent magnet improves the surface coating method of coercive force, and its method comprises the following steps:

[0019] A. Use a laser coating machine to spray the rare earth mixture on the surface of the permanent magnet;

[0020] B. Carry out heat treatment to the permanent magnet after spraying.

[0021] Under the premise of not introducing too many impurity additives and affecting the structure of the permanent magnet (corrosion, oxidation, etc.), the coercive force of the permanent magnet can be greatly improved by using less rare earth (the coercive force of the permanent magnet is on the original basis 5000A / m above), effectively reducing the production cost of permanent magnets, without affecting its remanence and magnetic energy product, and its coercive force is greatly improved. At the same time, its operation process is simple and suitable for large-scale industrial applications.

[0022] The rare earth mixed solution in step A i...

Embodiment 2

[0030] A kind of rare earth permanent magnet improves the surface coating method of coercive force, and its method comprises the following steps:

[0031] A. Use a laser coating machine to spray the rare earth mixture on the surface of the permanent magnet;

[0032] B. Carry out heat treatment to the permanent magnet after spraying.

[0033] Under the premise of not introducing too many impurity additives and affecting the structure of the permanent magnet (corrosion, oxidation, etc.), the coercive force of the permanent magnet can be greatly improved by using less rare earth (the coercive force of the permanent magnet is on the original basis 5000A / m above), effectively reducing the production cost of permanent magnets, without affecting its remanence and magnetic energy product, and its coercive force is greatly improved. At the same time, its operation process is simple and suitable for large-scale industrial applications.

[0034] The rare earth mixed solution in step A i...

Embodiment 3

[0042] A kind of rare earth permanent magnet improves the surface coating method of coercive force, and its method comprises the following steps:

[0043]A. Use a laser coating machine to spray the rare earth mixture on the surface of the permanent magnet;

[0044] B. Carry out heat treatment to the permanent magnet after spraying.

[0045] Under the premise of not introducing too many impurity additives and affecting the structure of the permanent magnet (corrosion, oxidation, etc.), the coercive force of the permanent magnet can be greatly improved by using less rare earth (the coercive force of the permanent magnet is on the original basis 5000A / m above), effectively reducing the production cost of permanent magnets, without affecting its remanence and magnetic energy product, and its coercive force is greatly improved. At the same time, its operation process is simple and suitable for large-scale industrial applications.

[0046] The rare earth mixed solution in step A is...

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PUM

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Abstract

The invention discloses a surface coating method for improving the coercive force of a rare earth permanent magnet. The method comprises the following steps of: A, spraying a rare earth mixed solutionon the surface of a permanent magnet by adopting a laser coating machine, and B, performing heat treatment on the sprayed permanent magnet. The rare earth mixed solution in the step A is composed ofneodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid compound phosphate and water, and the weight parts are: 3-6 parts of neodymium, 2-6 parts of promethium, 2-5 parts of samarium, 3-8 parts of europium and 4-10 parts of holmium. On the premise of not introducing excessive impurity additives and not affecting the structure (corrosion, oxidation and the like) ofthe permanent magnet, the coercive force of the permanent magnet can be greatly improved by using less rare earth (the coercive force of the permanent magnet is improved by more than 5000 A / m on the original basis), the production cost of the permanent magnet is effectively reduced, the residual magnetism and the magnetic energy product are not influenced, the coercive force is greatly improved, meanwhile, the operation process is simple, and the method is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to the technical field of permanent magnets, in particular to a surface coating method for raising coercive force of rare earth permanent magnets. Background technique [0002] Magnets that can maintain their magnetism for a long time are called permanent magnets, such as natural magnetite (magnetite) and artificial magnets (alnico) The demand for hybrid electric vehicles, pure electric vehicles and energy-saving air-conditioning compressors is increasing, and the demand for rare earth permanent magnet materials with high coercive force (such as R-Fe-B series rare earth permanent magnets) is also increasing , the traditional method of improving the coercive force requires the use of a large amount of rare earth elements, resulting in a substantial increase in the cost of the magnet, and will sacrifice part of the remanence and energy product. Therefore, we propose a surface coating method for rare earth permanent magnets to increa...

Claims

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Application Information

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IPC IPC(8): H01F41/14H01F41/22
CPCH01F41/14H01F41/22
Inventor 刘兴民雷震天
Owner 江苏甬磁磁性材料研究院有限公司
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