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A method of accelerating the diffusion and penetration of dy/tb adhesion layer on the surface of sintered NdFeB magnet

A technology of NdFeB and adhesion layer, which is applied in the field of accelerating the diffusion of Dy/Tb adhesion layer on the surface of sintered NdFeB magnets, which can solve the problems of resources, energy waste, adverse effects on the structure and performance of sintered NdFeB matrix, and unfavorable efficiency. , to achieve the effects of improving efficiency, facilitating industrial production, and inhibiting growth

Active Publication Date: 2017-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing grain boundary infiltration treatment requires the sample to be relatively thin (usually less than 5mm thick), and to be treated at high temperature (generally higher than 800°C) for a long time (generally more than 3h) to achieve the infiltration of Dy / Tb atoms. This is not conducive to improving efficiency, causing a waste of resources and energy, and may also have an adverse effect on the structure and properties of the sintered NdFeB matrix

Method used

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  • A method of accelerating the diffusion and penetration of dy/tb adhesion layer on the surface of sintered NdFeB magnet
  • A method of accelerating the diffusion and penetration of dy/tb adhesion layer on the surface of sintered NdFeB magnet
  • A method of accelerating the diffusion and penetration of dy/tb adhesion layer on the surface of sintered NdFeB magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1: The surface of a 4mm thick N40 magnet is coated with Dy 2 o 3 After 10MPa / 700℃ / 0.5h heat treatment

[0025] Select an N40 magnet with a size of 20mm×20mm×4mm and mark it as 0# sample. The N40 magnet was degreased with 5% trisodium phosphate, washed with distilled water, washed with 5% nitric acid for 15-30s, ultrasonically cleaned with distilled water, and dried; Dy with a particle size of 2 μm 2 o 3 Mix the solution with ethanol according to the weight ratio of 2:1, put the magnetic sheet into the solution, mix it with ultrasonic wave for 1-3min, take it out and dry it; put the sample in the furnace, and evacuate to (3-5)×10 -3Pa, start rapid heating to 700°C, fill it with argon to apply an isostatic pressure of 10MPa, keep it warm for 0.5h, and then perform heat treatment at 500°C / 2h, this sample is marked as 1# sample. Except that no pressure is applied, the other process parameters are consistent with the 1# sample, which is marked as the 2# sample. ...

Embodiment 2

[0028] Example 2: The surface of a 7mm thick 38H magnet is coated with DyF 3 After heat treatment at 6MPa / 740℃ / 1h

[0029] Select a 38H magnet with a size of 20mm×20mm×7mm and mark it as 0# sample. The 38H magnet is degreased by 5% trisodium phosphate, washed with distilled water, washed with 5% nitric acid for 15-30s, ultrasonically cleaned with distilled water, and dried; DyF with a particle size of 2 μm 3 Mix the solution with ethanol according to the weight ratio of 2:1, put the magnetic sheet into the solution, mix it with ultrasonic wave for 1-3min, take it out and dry it; put the sample in the furnace, and evacuate to (3-5)×10 -3 Pa, start rapid heating to 740°C, fill it with argon to apply an isostatic pressure of 5MPa, keep it warm for 1h, and then perform heat treatment at 500°C / 2h, this sample is marked as 1# sample. Except that no pressure was applied, the other process parameters were consistent with the 1# sample, which was labeled as 2# sample. The Dy content ...

Embodiment 3

[0032] Example 3: 20MPa / 720°C / 1h heat treatment after sputtering Tb metal layer on the surface of 10mm thick N48 magnet

[0033] Select an N48 magnet with a size of φ15mm×10mm and mark it as 0# sample. The N48 magnet is degreased with 5% trisodium phosphate, cleaned with distilled water, washed with 5% nitric acid for 15-30s, ultrasonically cleaned with distilled water, and dried; the sintered NdFeB that has been cleaned on the surface is used as the substrate, and sputtered on its surface Attach a layer of Tb metal layer; place the sample in the furnace and vacuumize to (3-5)×10 -3 Pa, start rapid heating to 720°C, fill it with argon to apply an isostatic pressure of 20MPa, keep it warm for 1h, and then perform heat treatment at 500°C / 2h, this sample is marked as 1# sample. Except that no pressure was applied, the other process parameters were consistent with the 1# sample, which was labeled as 2# sample, and the Tb content and magnetic property parameters are shown in Table...

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Abstract

The invention belongs to the field of rare earth permanent magnet materials, and particularly provides a method for accelerating the diffusion and penetration of a Dy / Tb adhesion layer on the surface of a sintered NdFeB magnet. It is characterized in that after the Dy / Tb element is attached to the surface of the sintered NdFeB magnet, it undergoes a high-pressure heat treatment of 1-100 MPa to accelerate the diffusion of Dy / Tb element in the grain boundary of the sintered NdFeB magnet, thereby obtaining a high coercive force magnet . The specific process steps are: first clean the surface of the NdFeB magnet, attach Dy / Tb elements on the surface of the clean NdFeB magnet, and then perform high-pressure heat treatment on it, so that the Dy / Tb elements can rapidly diffuse in the grain boundary of the magnet. , and then through medium-temperature heat treatment to further improve the boundary structure of the magnet, and finally obtain a high-coercivity NdFeB magnet. The outstanding advantages of the present invention are: high-pressure heat treatment can accelerate the diffusion and infiltration of Dy / Tb elements in grain boundaries, not only can process thicker samples, but also greatly reduce heat treatment temperature and heat treatment time, and significantly improve efficiency.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for accelerating the diffusion and penetration of a Dy / Tb adhesion layer on the surface of a sintered NdFeB magnet. Background technique [0002] The global attention and promotion of new energy vehicles and wind power industries will have a major impact on high-end rare earth permanent magnets. Both direct-drive permanent magnet units for wind power generation and drive motors for new energy vehicles will use high-coercivity sintered NdFeB in large quantities. magnet. As we all know, in order to increase the coercive force of NdFeB sintered magnets, it is a very effective method to partially replace Nd in the magnets with heavy rare earth elements such as Dy / Tb. However, if the traditional alloying method is used, a large amount of Dy / Tb needs to be added to achieve high coercive force, which not only reduces the remanence and magnetic energy produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00H01F41/02H01F1/057H01F1/08
Inventor 包小倩高学绪汤明辉卢克超
Owner UNIV OF SCI & TECH BEIJING
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