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Preparation method for corrosion-resistant sintered neodymium iron boron permanent magnet with aluminum-based ceramic composite coating on surface

A technology of composite coating and aluminum-based ceramics, which is applied in the manufacture of permanent magnets, coatings, magnetic objects, etc., can solve problems such as poor corrosion resistance, product failure, and easy corrosion, so as to achieve uniform composite coating and prolong service life , Improve the effect of corrosion resistance

Inactive Publication Date: 2018-11-06
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the sintered NdFeB permanent magnet is limited by the production process, the porous surface of the substrate and its multi-phase structure, it is prone to corrosion in a humid environment, resulting in product failure. This shortcoming of poor corrosion resistance seriously affects its further development. application
At present, surface protection treatment is the most effective method to improve the corrosion resistance of sintered NdFeB permanent magnets, mainly including phosphating treatment, electroplating, electrophoresis, chemical plating, magnetron sputtering, etc. Although these methods can improve the corrosion resistance of sintered NdFeB permanent magnets to a certain extent The corrosion resistance of iron boron, but with the continuous expansion of application fields, it can no longer meet the needs of new fields

Method used

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  • Preparation method for corrosion-resistant sintered neodymium iron boron permanent magnet with aluminum-based ceramic composite coating on surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Take the sintered NdFeB blank with a specification of 54*54*27(M), remove the black skin and oxide layer on the surface through a vertical mill, and then slice it into a sheet with a specification of 50*20*6(M)mm The workpiece, and chamfering, polishing and grinding the workpiece;

[0024] 2) Put the NdFeB magnet processing workpiece into 3% nitric acid solution, pickle and derust for 20 seconds, and clean it with ultrasonic waves;

[0025] 3) Place the NdFeB processed workpiece after pickling, derusting and cleaning in a vacuum coating machine, use circulating argon ions to clean the surface of the magnet, and then vacuum evaporate aluminum; the circulating argon ion cleaning process: the vacuum degree is 5Pa, Ar 2 The flow rate is 150sccm, the bombardment time is 45min; the vacuum evaporation aluminum process: the vacuum degree is 1×10 -3 Pa, evaporation current 2500A, vacuum evaporation 30min.

[0026] 4) Mix nano-graphite with distilled water, set the ultrason...

Embodiment 2

[0030] 1) Take the sintered NdFeB blank with a specification of 54*54*27(M), remove the black skin and oxide layer on the surface through a vertical mill, and then slice it into a sheet with a specification of 50*20*6(M)mm The workpiece, and chamfering, polishing and grinding the workpiece;

[0031] 2) Put the NdFeB magnet processing workpiece into 10% nitric acid solution, pickle and derust for 50 seconds, and clean it with ultrasonic waves;

[0032] 3) Place the NdFeB processed workpiece after pickling, derusting and cleaning in a vacuum coating machine, use circulating argon ions to clean the surface of the magnet, and then vacuum evaporate aluminum; the circulating argon ion cleaning process: the vacuum degree is 0.1Pa, Ar 2 The flow rate is 100sccm, the bombardment time is 90min; the vacuum evaporation aluminum process: the vacuum degree is 7×10 -3 Pa, evaporation current 3500A, vacuum evaporation 60min.

[0033] 4) Mix nano-graphite with distilled water, set the ultra...

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Abstract

The invention discloses a preparation method for a corrosion-resistant sintered neodymium iron boron permanent magnet with an aluminum-based ceramic composite coating on a surface. The preparation method comprises the following steps of; processing sintered neodymium iron boron blank into a sheet, and performing surface treatment on the neodymium iron boron sheet; evaporating aluminum in vacuum; putting the sheet into an electrolyte solution as an anode, performing micro-arc oxidizing treatment, and preparing the aluminum-based ceramic composite coating on the surface of the neodymium iron boron sheet; and cleaning and drying to obtain the high-corrosion-resistance neodymium iron boron permanent magnet. The preparation method adopts evaporating aluminum in vacuum to generate a layer of aluminum film on the surface of a neodymium iron boron workpiece, so that micro defects of the workpiece surface are improved, and follow-up micro-arc oxidization is prepared; and micro-arc oxidization is performed based on the generated aluminum film, so that the generated composite coating is more uniform, and combination force is remarkably reinforced.

Description

technical field [0001] The invention belongs to the field of surface protection of sintered NdFeB permanent magnets, and in particular relates to a preparation method of a corrosion-resistant sintered NdFeB permanent magnet with an aluminum-based ceramic composite coating on the surface. Background technique [0002] Because of its high saturation magnetization, coercive force and magnetic energy product, NdFeB permanent magnets have been widely used in energy, transportation, machinery, medical, home appliances, IT and other industries since their inception, and their products involve many fields of the national economy. . However, because sintered NdFeB permanent magnets are limited by the production process, the porous surface of the substrate and its own multi-phase structure, it is prone to corrosion in a humid environment, resulting in product failure. This shortcoming of poor corrosion resistance seriously affects its further development. application. At present, su...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/24C25D11/34H01F41/02H01F1/057
CPCC23C14/16C23C14/24C25D11/026C25D11/34H01F1/057H01F41/026
Inventor 赵占中曹玉杰李绪亮黄秀莲陈静武衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL