A method of ion implanting rare earth and alloy to improve the performance of sintered NdFeB magnet

A technology of ion implantation and neodymium iron boron, which is applied in the direction of magnetic materials, magnetic objects, and the magnetism of inorganic materials, can solve the problems of low actual utilization rate of diffusion sources, residues, and many diffusion sources, etc., to increase the depth of ion implantation and shorten the Diffusion path, effect of improving diffusion efficiency

Active Publication Date: 2018-03-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the existing sintered NdFeB magnet grain boundary diffusion technology, many diffusion sources remain on the surface of the magnet, and the actual utilization rate of the diffusion source is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Change the alloy composition to Pr 7.03 Nd 21.84 Fe bal Cu 0.2 Ga 0.1 B 0.98 (mass fraction) NdFeB oriented green compacts are pre-fired in vacuum with a density of 95% and a size of The pre-sintered green body, numbered 1#;

[0016] 2) Put the pre-sintered compact into the ion implantation device, inject the heavy rare earth element Dy into the pre-sintered compact in the form of high-energy ions, the implantation energy is 200keV, and the implantation metering is 4×10 17 cm -2 , the obtained sample number is 2#;

[0017] 3) The samples numbered 1# and 2# were further sintered and densified and the grain boundaries diffused, the temperature was 950 ° C, the time was 1 h, the pressure was 2 MPa (provided by argon), and the vacuum degree before filling with argon was 3×10 -3 Pa;

[0018] 4) The 1# and 2# samples that have undergone sintering densification and grain boundary diffusion are subjected to vacuum tempering heat treatment, and the process parameter...

Embodiment 2

[0023] 1) Change the alloy composition to Pr 7.03 Nd 21.84 Fe bal Cu 0.2 Ga 0.1 B 0.98 (mass fraction) NdFeB oriented green compacts are pre-fired in vacuum with a density of 98% and a size of The pre-sintered green body, numbered 3#;

[0024] 2) Put the pre-sintered compact into the ion implantation device, and inject the rare earth alloy Dy in the form of high-energy ions 70 Cu 30 (Atomic fraction) injected into the calcined billet, the injection energy is 200keV, and the injection metering is 2×10 17 cm -2 , the obtained sample number is 4#;

[0025] 3) The samples numbered 3# and 4# were sintered and densified and the grain boundaries diffused, the temperature was 950°C, the time was 1h, the pressure was 0.2MPa (provided by argon), and the vacuum degree before filling with argon was 3×10 -3 Pa;

[0026] 4) The samples numbered 3# and 4# after the grain boundary diffusion treatment were subjected to vacuum tempering heat treatment, and the process parameters wer...

Embodiment 3

[0031] 1) Change the alloy composition to Pr 9.8 Nd 20.2 Fe bal al 0.15 Cu 0.2 Ga 0.1 B 0.98 (Mass fraction) Vacuum pre-fired density is 92%, size is pre-sintered compact, numbered 5#;

[0032] 2) Put the pre-sintered compact into the ion implantation device, and inject the rare earth alloy Pr in the form of high-energy ions 35 Dy 35 Cu 30 (Atomic fraction) into the pre-sintered compact, the injection energy is 300keV, and the injection metering is 6×10 17 cm -2 , the number is 6#;

[0033] 3) The samples numbered 5# and 6# were further sintered and densified and the grain boundaries diffused, the temperature was 920 ° C, the time was 1 h, the pressure was 3 MPa (provided by argon), and the vacuum degree before filling with argon was 3×10 -3 Pa;

[0034] 4) The samples numbered 5# and 6# that have undergone sintering densification and grain boundary diffusion treatment are subjected to vacuum tempering heat treatment, and the process parameters are: temperature 5...

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Abstract

The invention provides a method for improving the performance of a sintered neodymium-iron-boron magnet through ion implantation of rare earth and alloys, and belongs to the field of rare-earth permanent magnet materials. The method comprises the following specific process steps: carrying out vacuum presintering on a neodymium-iron-boron oriented compact to obtain a presintered compact; implanting the rare earth and alloy elements into the presintered compact in a form of high-energy ions by a high-energy ion implantation technology; and further carrying out sintering densification and carrying out grain boundary diffusion of the rare earth and the alloy elements to improve the coercive force of the sintered neodymium-iron-boron magnet. The method has the advantages that the ion implantation dosage can be controlled by controlling energy; the rare earth and the alloy elements are effectively utilized; excessive rare earth and alloy elements are prevented from being enriched on the surface and the grain boundary of the magnet; the ion implantation depth is increased by certain porosity of the presintered compact; the diffusion path is shortened; and the diffusion efficiency is improved.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a method for improving the performance of sintered NdFeB magnets by ion implanting rare earth and alloys. Background technique [0002] As the "third generation" permanent magnet material, sintered NdFeB magnet is still the permanent magnet material with the highest magnetic energy product, and is widely used in many fields such as automobiles, electronics, wind power generation, medical equipment, and national defense industry. In particular, the "Thirteenth Five-Year Plan" strongly supports the new energy automobile industry, which will greatly promote the development of the industry. High-end applications require sintered NdFeB magnets to have both high remanence Br and high coercive force Hci. Through composition optimization, quick-setting ingot casting, hydrogen explosion, orientation pressing, cold isostatic pressing, and oxygen control technologies, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08C23C14/48
CPCC23C14/48H01F1/0571H01F1/0575H01F41/0266
Inventor 高学绪卢克超包小倩汤明辉李纪恒
Owner UNIV OF SCI & TECH BEIJING
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