Neodymium iron boron permanent magnet with corrosion preventing and abrasion resisting clad layer and preparing method of neodymium iron boron permanent magnet

An anti-corrosion and wear-resistant, permanent magnet technology, used in the manufacture of permanent magnets, magnets, magnetic objects, etc., can solve problems such as damage to the magnetic properties of corrosion-resistant magnets, and achieve a wide range of applications.

Inactive Publication Date: 2020-09-04
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a lot of experiments, it is found that adjusting the chemical composition to improve the corrosion resistance of NdFeB will damage the magnetic properties of the magnet to a certain extent.

Method used

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  • Neodymium iron boron permanent magnet with corrosion preventing and abrasion resisting clad layer and preparing method of neodymium iron boron permanent magnet

Examples

Experimental program
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Effect test

preparation example Construction

[0022] A method for preparing an NdFeB permanent magnet with an anti-corrosion and wear-resistant coating, which is used to prepare the above-mentioned NdFeB permanent magnet, the preparation method comprising the following steps:

[0023] S1: degreasing, grinding, polishing and cleaning the surface of the permanent magnet body 1;

[0024] S2: The bonding layer 2, the inner protective layer 3 and the outer protective layer 4 are sequentially deposited on the surface of the permanent magnet body 1 by physical vapor deposition.

[0025] In an optional embodiment, Al in the preparation method 2 o 3 The purity of / Al / AlN can be greater than 99wt%, Al 2 o 3 The / Al / AlN film layer is used as the bonding layer. The film layer formed by the high-purity target effectively combines the inner and outer protective layers with the NdFeB permanent magnet body substrate, smoothes the surface defects of the substrate, improves the quality of the upper layer film, and also plays a role in c...

Embodiment 1

[0029] Fill the vacuum coating chamber with argon to a pressure of 0.5Pa, turn on the Al 2 o 3 Target, adjust the RF power to 180W, and pre-sputter the target for 30min. Degrease, grind, polish and clean the permanent magnet body 1 to deposit the bonding layer 2; then, fill the vacuum chamber with argon to a pressure of 0.7Pa, and the radio frequency power is 150W, and sputter on the bonding layer 2 by radio frequency Deposit the inner protective layer 3; finally, fill the vacuum chamber with argon gas until the pressure is 0.6Pa, and the radio frequency power is 100W, and deposit the outer protective layer 4 on the inner protective layer 3 by radio frequency sputtering; after testing, under this condition, the The performance of the composite film layer is as follows:

[0030] project performance total film thickness 4.3µm Film hardness 10.86GPa Corrosion protection performance At a temperature of 38°C and a salt water concentration of 3.5%, ...

Embodiment 2

[0032] Fill the vacuum coating chamber with argon to a pressure of 0.5Pa, turn on the Al 2 o 3 Target, adjust the RF power to 180W, and pre-sputter the target for 30min. Degrease, grind, polish and clean the permanent magnet body 1 to deposit the bonding layer 2; then, fill the vacuum chamber with argon to a pressure of 0.7Pa, and the radio frequency power is 150W, and sputter on the bonding layer 2 by radio frequency Deposit the inner protective layer 3; finally, fill the vacuum chamber with argon gas until the pressure is 0.6Pa, and the radio frequency power is 200W, and deposit the outer protective layer 4 on the inner protective layer 3 by radio frequency sputtering; after testing, under this condition, the The performance of the composite film layer is as follows:

[0033] project performance total film thickness 5.6µm Film hardness 19.37GPa Corrosion protection performance At a temperature of 38°C and a concentration of salt water of 3.5...

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Abstract

The invention provides a neodymium iron boron permanent magnet with a corrosion preventing and abrasion resisting clad layer and a preparing method of the neodymium iron boron permanent magnet. According to the preparing method, the magnetic performance of the neodymium iron boron permanent magnet is not damaged, and in addition, the neodymium iron boron permanent magnet corrosion preventing and abrasion resisting clad layer high in binding force, good in corrosion resisting effect and resistant to abrasion is prepared on the surface of the permanent magnet. The preparing method comprises thefollowing steps that coating pretreatment is conducted on the neodymium iron boron permanent magnet, and a fresh surface shows from the permanent magnet; the neodymium iron boron permanent magnet is moved into a vacuum coating machine vacuum coating chamber, and the magnetron sputtering technology is adopted for sequentially depositing a combining layer, an inner protection layer and an outer protection layer on the surface of the neodymium iron boron permanent magnet at the temperature of 150 DEG C or below. Through the composite film layer structure design, corrosion resistance performance and abrasion resistance performance coexist, it is guaranteed that a film layer is still effective when local abrasion happens to a surface-layer film, and it is ensured that the magnet can still normally work under the extreme work condition.

Description

technical field [0001] The invention relates to the field of surface protection of sintered NdFeB magnets, in particular to a preparation method of an anti-corrosion and wear-resistant coating for NdFeB permanent magnets and an NdFeB permanent magnet with the coating. Background technique [0002] Sintered NdFeB, as a representative of the third generation rare earth permanent magnet materials, has extremely high magnetic energy product, coercive force, energy density and anti-interference ability of external magnetic field, as well as good machining performance and high cost performance. These excellent properties make NdFeB magnets have a wide market in the production of electronic components in modern industry, making it possible to reduce the thickness, miniaturization and mass production of various motors, magnetic separation instruments and instruments. In the case of wear, NdFeB permanent magnet materials are prone to oxidation and hydrogen evolution reactions and are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/02C23C14/08C23C14/16C23C14/06H01F7/02H01F41/02
CPCC23C14/35C23C14/022C23C14/081C23C14/165C23C14/0617C23C14/0635C23C14/0605H01F7/021H01F41/026
Inventor 邓文宇齐丽君段永利
Owner SHENYANG GENERAL MAGNETIC
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