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Preparation method of high coercive force magnet

A technology of high coercive force and magnets, applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of reduced residual magnetism, heavy rare earth transition consumption, and increased production costs, so as to improve residual magnetism and hinder Effect of grain growth and coercivity improvement

Active Publication Date: 2020-10-27
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the process of manufacturing sintered NdFeB permanent magnet materials, heavy rare earths are generally added in the alloy smelting process or directly mixed with heavy rare earths in the raw materials to improve the coercive force of the magnet, but the direct addition of heavy rare earths can cause magnetic dilution and lead to The remanence is reduced, and it leads to the excessive consumption of heavy rare earths, which leads to the increase of production cost. Therefore, there is a need for a preparation method that improves the coercive force of the magnet while ensuring high remanence.

Method used

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Examples

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Effect test

Embodiment 1

[0034] A method for preparing a high-coercivity magnet, comprising the following steps:

[0035] Step 1, taking Nd-Fe-B powder and spraying nano-rare earth powder on its upper surface, and then alternately spraying Nd-Fe-B powder and nano-rare earth powder on the upper surface of nano-rare earth powder to obtain a layered mixture;

[0036] Step 2: pressing the layered mixture into a compact, and placing the compact in a vacuum heat treatment furnace for heat treatment to obtain a high coercivity magnet. The vacuum heating treatment process is a continuous grain boundary diffusion and grain boundary phase homogenization treatment process, and a stepwise heating method.

[0037] The preparation method of the high coercive force magnet of the present invention can obtain layered mixture by the powder distributing device 1 of existing full-automatic anaerobic press, as figure 1 As shown, the powder distributing device 1 is placed in a magnetic field, first arrange one deck of Nd-...

Embodiment 2

[0041] A method for preparing a high-coercivity magnet, comprising the following steps:

[0042] Step 1, take the Nd-Fe-B powder and spray nano-rare earth powder on its upper surface, then alternately spray Nd-Fe-B powder and nano-rare earth powder on the upper surface of the nano-rare earth powder to obtain a layered mixture; in this embodiment There are altogether 6 layers of Nd-Fe-B powder layer and nano-rare earth powder layer.

[0043] Step 2: pressing the layered mixture into a compact, and placing the compact in a vacuum heat treatment furnace for heat treatment to obtain a high coercivity magnet.

[0044] In the preparation method of the high-coercivity magnet, the nano rare earth powder is rare earth terbium, the mass fraction of Nd-Fe-B powder in the layered mixture is 99.6%, and the particle size of the Nd-Fe-B powder is 3 μm.

[0045] In the preparation method of the high coercive force magnet, the heat treatment in step 2 is specifically: evacuating the vacuum he...

Embodiment 3

[0048] Step 1, take the Nd-Fe-B powder and spray nano-rare earth powder on its upper surface, then alternately spray Nd-Fe-B powder and nano-rare earth powder on the upper surface of the nano-rare earth powder to obtain a layered mixture; in this embodiment There are altogether 6 layers of Nd-Fe-B powder layer and nano-rare earth powder layer.

[0049] Step 2: pressing the layered mixture into a compact, and placing the compact in a vacuum heat treatment furnace for heat treatment to obtain a high coercivity magnet.

[0050] In the preparation method of the high-coercivity magnet, the nano-rare earth powder is rare earth dysprosium-terbium alloy powder, the mass fraction of Nd-Fe-B powder in the layered mixture is 99.7%, and the particle size of Nd-Fe-B powder is 3.2 μm.

[0051] In the preparation method of the high coercive force magnet, the heat treatment in step 2 is specifically: evacuating the vacuum heat treatment furnace until the pressure is less than 7×10 -3 Pa, ra...

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Abstract

The invention discloses a preparation method of a high coercivity magnet, comprising the following steps: step 1, spraying Nd-Fe-B powder on the upper surface of the nanometer rare earth powder, and then spraying the upper surface of the nanometer rare earth powder alternately with Nd-Fe-B powder, nanometer rare earth powder to obtain a layered mixture; 2, pressing the layered mixture into a compact, and heat treating the compact in a vacuum heat treatment furnace to obtain a high coercivity magnet. The preparation method of the high coercivity magnet of the invention comprises the following steps of: layered arranging Nd-Fe-B powder and nano rare earth powder are to obtain layered compound, and then uniformly diffusing the nano rare earth powder of each layer to the grain boundary of themain phase of Nd2Fe14B by heat treatment, and uniformly coating the main phase of Nd2Fe14B, improvsing the anisotropic field of the magnet, and improving the coercivity and effectively restraining thedecrease of the remanence.

Description

technical field [0001] The invention relates to the technical field of preparation methods of NdFeB magnets, in particular to a preparation method of high coercive force magnets. Background technique [0002] Rare earth permanent magnet material is a novel permanent magnet material that appeared in the late 1960s. They have both high magnetic energy product and high coercive force, and are necessary functional materials in high-tech fields. At present, they have become indispensable functional materials in many fields such as aerospace, national defense, electronic communication, clean energy, transportation, mining machinery, medical care and household appliances. Sm-Co and Nd-Fe-B rare earth permanent magnet materials, in addition to their inherent energy-saving advantages, their high magnetic energy product and high coercive force characteristics will effectively promote the integration of modern science and technology and information industries , miniaturization and in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0293
Inventor 刘月玲刘润海
Owner 京磁材料科技股份有限公司
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