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A kind of anti-corrosion NdFeB magnet and preparation method thereof

A neodymium-iron-boron and magnet technology is applied in the field of anti-corrosion neodymium-iron-boron magnets and their preparation, which can solve the problems of high requirements for coating integrity, high rejection rate, and easy peeling of coatings, so as to improve product acceptance and have little impact on magnetic properties. , reduce the effect of formula adjustment

Active Publication Date: 2020-12-15
宁波合力磁材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitride composite coating is similar to nickel plating, its process operation is more complicated, mass production is difficult, the requirements for the integrity of the coating are higher, the process cost is high, and the scrap rate is high
The nitride composite coating is the same as nickel plating. After the coating is scratched and damaged, it will aggravate the electrocorrosion of NdFeB. The osmotic pressure difference is formed between the surface of the magnet, the oxidation corrosion is also intensified, and the coating is bubbled, which leads to further damage to the coating, and the local bonding force is reduced.
[0008] Therefore, the existing NdFeB magnets have poor bonding between the surface and the coating material, and the coating is easy to peel off; or the nature of the coating material causes the NdFeB corrosion to intensify after the coating is damaged, thus making the coating anti-corrosion technology in practical applications. Anti-corrosion protection, did not achieve the expected effect and timeliness

Method used

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  • A kind of anti-corrosion NdFeB magnet and preparation method thereof
  • A kind of anti-corrosion NdFeB magnet and preparation method thereof
  • A kind of anti-corrosion NdFeB magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0050] as attached figure 1 As shown, a kind of anti-corrosion NdFeB magnet, comprises NdFeB sintered magnet 1 and the anti-corrosion coating 2 on the outside of Nd-Fe-B sintered magnet 1 (in the accompanying drawing, for reflecting the existence of anti-corrosion coating 2, the thickness of anti-corrosion coating 2 in the accompanying drawing Far greater than the actual thickness of the anti-corrosion coating 2, the anti-corrosion coating 2 in the drawings is only for illustration, the actual thickness of the sintered NdFeB magnet 1 and the anti-corrosion coating 2 depends on the actual design and production).

[0051] NdFeB sintered magnet 1 is sintered NdFeB magnet, and its shape can be determined according to actual product requirements. The specifications of the anti-corrosion NdFeB magnet and NdFeB sintered magnet 1 that appear below in this application are determined by referring to the sample requirements during the test , which is a test sample product, not the limite...

Embodiment 7

[0099] An anti-corrosion NdFeB magnet, based on the basis of Example 4, the difference is that the NdFeB formula is adjusted without adding Dy, Tb, Sb element materials, and the obtained NdFeB sintered magnet internal element detection results Nd: 30wt%; B: 1.05wt%; Al: 1.3wt%; N: 0.7wt%; Cu: 0.8wt%; Co: 0.8wt%;

Embodiment 8

[0120] An anti-corrosion NdFeB magnet, on the basis of Example 4, change the time of its electroplating coating to obtain Examples 8A-8D with different thicknesses of the anti-corrosion coating 1, and the thickness of the anti-corrosion coating in Examples 8A-8D is shown in Table 5 .

[0121] Table five. The thickness parameter table of embodiment 8 anticorrosion coating

[0122] Example 8A Example 8B Example 8C Example 8D Anti-corrosion coating thickness / μm 5 8 17 20

[0123] The anticorrosion performance test of the complete coating in the anticorrosion performance test was carried out on the NdFeB magnet prepared in Example 8, and the test results are shown in Table 6.

[0124] Table six. Embodiment 8 complete coating anticorrosion performance test result table

[0125] test Test parameters Example 8A Example 8B Example 8C Example 8D Anti-corrosion performance testing NdFeB magnet rust time A / h 73 88 130 140 ...

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Abstract

The invention relates to a sintered NdFeB magnet with a coating and discloses an anticorrosive neodymium iron boron magnet and a preparation method thereof. The anticorrosive neodymium iron boron magnet includes a neodymium iron boron sintered magnet and an anticorrosive coating at an outer side of the sintered magnet, wherein the neodymium iron boron sintered magnet contains elements of 1.3-2.5 wt% of Al and 0.5-0.9 wt% of N, more than 90% of the N element is present in the NdFeB sintered magnet in the form of AlN, the AlN exists in the form of adhesion on a surface of the NdFeB sintered magnet and walls of internal pores, the anti-corrosion coating is combined with the AlN, the anti-corrosion coating is composite coating of aluminum hydroxide and plating metal, and the plating metal is zinc or nickel. Aluminum metal is utilized as an aluminum source, after the NdFeB is sintered and is transformed under a high temperature environment of nitrogen, the continuous AlN is uniformly formedon the surface of the NdFeB sintered magnet, the protective effect of the anti-corrosion coating is improved by the synergistic effect of the AlN and the anti-corrosion coating, anti-corrosion performance of the anti-corrosion coating after being broken is further improved, for NdFeB magnet products in the prior art, formulation adjustment is reduced, R&D efficiency is improved, and product update is accelerated.

Description

technical field [0001] The invention relates to a coated sintered NdFeB magnet, in particular to an anti-corrosion NdFeB magnet and a preparation method thereof. Background technique [0002] Neodymium magnet (Neodymium magnet), also known as NdFeB magnet (NdFeB magnet), is a tetragonal crystal formed by neodymium, iron, and boron. Among the current magnet materials, neodymium magnets are famous for their high magnetic properties and high cost performance. NdFeB magnets are divided into sintered NdFeB magnets and bonded NdFeB magnets according to their preparation methods. Bonded NdFeB is molded by injection molding, and has magnetism in all directions and is corrosion-resistant, but because of the binder, the density is generally only 80% of the theoretical one. Sintered NdFeB is an anisotropic magnet produced by powder sintering. It has high density and stronger performance than bonded NdFeB. At present, it has reached more than 50M, but its corrosion resistance is poor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/02H01F1/057H01F41/02C22C38/16C22C38/14C22C38/60C22C38/10C22C38/06C22C33/02C25D3/22C25D3/12
CPCC22C33/0278C22C38/001C22C38/005C22C38/06C22C38/10C22C38/14C22C38/16C22C38/60C25D3/12C25D3/22H01F1/0577H01F7/021H01F7/0221H01F41/0253H01F41/026H01F41/0266
Inventor 赵吉明韩春昌赵文超
Owner 宁波合力磁材技术有限公司
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