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Preparation method of low-weightlessness sintered NdFeB magnet

A magnet, magnetron sputtering technology, applied in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of reduced magnetism, low content of rare earth elements, and high cost, and achieve the effect of improving corrosion resistance

Active Publication Date: 2021-06-18
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most cases, the addition of non-magnetic elements to NdFeB leads to a decrease in magnetic properties
At the same time, the content of rare earth elements is low, and the cost is high

Method used

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  • Preparation method of low-weightlessness sintered NdFeB magnet
  • Preparation method of low-weightlessness sintered NdFeB magnet
  • Preparation method of low-weightlessness sintered NdFeB magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a low-weight-loss sintered NdFeB magnet. A low-weight-loss sintered NdFeB magnet with high corrosion resistance is obtained by depositing a coating film on the sintered NdFeB magnet by magnetron sputtering, and then performing diffusion heat treatment, which specifically includes the following steps:

[0026] S1. Magnet pre-treatment: The sintered NdFeB magnet in the demagnetized state is washed with 3wt.% sodium hydroxide solution to remove oil for 3 minutes, then pickled with 3vol% nitric acid for 20 seconds, and then ultrasonically cleaned with absolute ethanol for 5 minutes to remove surface dirt, repeated Rinse 3 times and dry naturally to obtain a pretreated sintered NdFeB magnet ready for use.

[0027] S2, magnetron sputtering deposition coating: on the surface of the sintered NdFeB magnet after pretreatment, select 99.99% high-purity target material (size is ), and use the radio frequency magnetron sputtering method to coat a silicon film...

Embodiment 2

[0032] The preparation method of this embodiment is the same as that of Embodiment 1, except that the sputtering time in step S2 is 1 h.

[0033] After testing, according to the above steps, the weight loss of high corrosion resistance and low weight loss sintered NdFeB magnet is 0.18mg / cm 2 , its own corrosion resistance is obviously better than that of the comparative example.

Embodiment 3

[0035] The preparation method of this example is the same as that of Example 1, except that the holding time in step S3 is 4 hours.

[0036] After testing, according to the above steps, the weight loss of sintered NdFeB magnet with high corrosion resistance and low weight loss is 0.09mg / cm 2 , its own corrosion resistance is obviously better than that of the comparative example.

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Abstract

The invention discloses a preparation method of a low-weightlessness sintered NdFeB magnet. The low-weightlessness sintered NdFeB magnet with high corrosion resistance is obtained by performing magnetron sputtering deposition coating on the sintered NdFeB magnet and then performing diffusion heat treatment. According to the preparation method of the low-weightlessness sintered NdFeB magnet, regulation and control of the grain boundary of the surface layer of the sintered NdFeB magnet can be achieved, and corrosion resistance of the sintered NdFeB magnet is improved on the basis that the overall corrosion resistance is not affected.

Description

technical field [0001] The invention relates to the technical field of surface protection and anti-corrosion of rare earth permanent magnet materials, in particular to a preparation method of a low-weight loss sintered NdFeB magnet. Background technique [0002] Sintered NdFeB magnets have been called "Magnetic King" for their excellent magnetic properties since their inception. With the rapid development of my country's rare earth permanent magnet industry, the output of permanent magnet materials dominated by sintered NdFeB occupies a leading position in the world. With the rapid development of electronics, instruments, aerospace and new energy fields, the requirements for high-performance magnets are getting higher and higher. At the same time, the issue of high corrosion resistance of sintered NdFeB magnets has attracted much attention. [0003] Due to the multi-phase structure of the NdFeB magnet, there is a potential difference between the phases, and the Nd-rich phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/026H01F1/057
Inventor 吕珺刘帮徐光青吴玉程张鹏杰崔接武李炳山曹玉杰孙威刘辉
Owner HEFEI UNIV OF TECH
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