Method for accelerating permeation of Dy/Tb adhesive layer on surface of sintered neodymium-iron-boron 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: 2015-03-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for accelerating permeation of Dy/Tb adhesive layer on surface of sintered neodymium-iron-boron magnet
  • Method for accelerating permeation of Dy/Tb adhesive layer on surface of sintered neodymium-iron-boron magnet
  • Method for accelerating permeation of Dy/Tb adhesive layer on surface of sintered neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
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 at a weight ratio of 2:1, put the magnetic sheet into the solution, mix it with ultrasonic waves for 1-3 minutes, take it out and dry it; put the sample in the furnace, and vacuum 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. The Dy c...

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 at a weight ratio of 2:1, put the magnetic sheet into the solution, mix it with ultrasonic waves for 1-3 minutes, take it out and dry it; put the sample in the furnace, and vacuum 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 and magn...

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 magnetic materials, and particularly relates to a method for accelerating permeation of a Dy/Tb adhesive layer on the surface of a sintered neodymium-iron-boron magnet. The method is characterized in that a Dy/Tb element is subjected to high-pressure thermal treatment of 1-100MPa after being adhered to the surface of a sintered neodymium-iron-boron magnet, so as to accelerate permeation of the Dy/Tb element on a grain boundary of the sintered neodymium-iron-boron magnet, thus a high-coercivity magnet is obtained. The method specifically comprises the following processing steps: firstly, carrying out cleaning treatment on the surface of the neodymium-iron-boron magnet; attaching the Dy/Tb element to the clean surface of the neodymium-iron-boron magnet, and then carrying out high-pressure thermal treatment on the Dy/Tb element, so as to rapidly permeate the Dy/Tb element on the grain boundary of the magnet; further improving the magnet boundary structure through medium-temperature thermal treatment, and finally obtaining the high-coercivity neodymium-iron-boron magnet. The method has the outstanding advantages that the permeation of the Dy/Tb element on the grain boundary can be accelerated through high-pressure thermal treatment; a relatively thick sample can be processed; the thermal treatment temperature is greatly reduced; the thermal treatment time is shortened; and the efficiency is significantly improved.

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 Applications(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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